2016 Annual Aircraft Noise Report

Transcription

1 2016 Annual Aircraft Noise Report Ronald Reagan Washington National Airport Washington Dulles International Airport Reagan National Dulles International flyreagan.com mwaa.com flydulles.com

2 Table of Contents Executive Summary Introduction Ronald Reagan Washington National Airport (DCA) Airport Diagram and Information Runway Utilization FAA D.C. Metroplex Routes: Standard Arrivals and Standard Instrument Departures Typical Daily Flight Track Map Quarterly Track Density Plots Arrivals Departures Daily Average Operations by Hour Aircraft Fleet Mix DCA Nighttime Noise Rule: History Enforcement Policy Violations Noise Monitors: Program Locations Noise Data Noise Complaint Statistics Community Noise Working Group Washington Dulles International Airport (IAD) Airport Diagram and Information Runway Utilization FAA D.C. Metroplex Routes: Standard Arrivals and Standard Instrument Departures Typical Daily Flight Track Map Quarterly Track Density Plots Arrivals Departures Daily Average Operations by Hour Aircraft Fleet Mix Noise Monitors: Program Locations Noise Data Noise Complaint Statistics

3 Executive Summary The 2016 Annual Aircraft Noise Report provides data analysis of flight operations, noise monitoring data and noise complaint statistics for Ronald Reagan Washington National and Washington Dulles International airports. This report is a public information resource compiled by the Metropolitan Washington Airports Authority, which operates the airports on behalf of the federal government. The Airports Authority does not control or regulate airspace, aircraft operations, aircraft noise levels, airline schedules, airline fleet mix or local land-use zoning. Background: The National Capital region is unique within the Federal Aviation Administration s National Airspace System because of its high volume and type of aircraft operations, in addition to federally mandated prohibited airspace over the National Mall, White House and Naval Observatory. Aircraft noise continues to be a concern for neighborhoods in the National Capital region and across the nation. A recent increase in complaints at Reagan National and Dulles International has been attributed to community and media awareness of airline schedule changes to accommodate early and late-night travel demand, as well as the FAA s implementation of advanced satellite navigation procedures (Next Generation Air Transportation System), resulting in more consolidated flight corridors over some neighborhoods. Key Focus Areas: Flight Operations and Aircraft Fleet Mix Statistics: Approximately 4,000 aircraft operate in the Washington airspace each day. While many commercial aircraft operate at Reagan National and Dulles International, other aircraft operate at general aviation airfields and key military installations that hangar a fleet of government aircraft including Air Force One. This report provides Reagan National and Dulles International arrival and departure averages and typical daily flight corridors based on FAA computer-modeled routes. Runway utilization data and track density plots clarify flight corridor usage percentages. Aircraft fleet mix percentages reflect common aircraft types operating at Reagan National and Dulles International. Noise Monitoring Data: The Airports Authority voluntarily funds and operates a noise monitoring system with 34 noise monitors installed around Reagan National and Dulles International. The Airports Authority was the first U.S. airport system to upgrade its noise detection and processing software using ANEEM, Aircraft Noise Event Extraction Methodology. ANEEM improves aircraft, community and mixed noise source classifications based on available aircraft position and flight plan data. Monthly noise event summaries and detailed noise event reports for each monitor are published in this report and online (Noise Reports and Data) as general information to track historical trends only. Federal law prohibits the use of flight track and noise monitoring data to audit, investigate or enforce any regulation. Noise Complaint Statistics: As a public resource, the Airports Authority also voluntarily collects, publishes and forwards noise complaints to the FAA and airlines for their consideration of changes to flight procedures, schedules and fleet mix. In 2016, Reagan National received 36,653 complaints from 836 individuals (762 households); the majority of individuals (51.3%) submitted one complaint. Dulles International received 6,030 complaints from 93 individuals (89 households); the majority of individuals (64.5%) submitted one complaint. Additional Information: The Airports Authority provides additional noise-related information on its websites, MWAA, Reagan National and Dulles International. 2

4 Introduction Reagan National and Dulles International airports are the only two commercial airports in the United States that are owned by the federal government. The Metropolitan Washington Airports Authority is a regional organization established by the U.S. Congress to operate both airports on behalf of the federal government. Approximately 800 commercial daily operations occur at each airport, ultimately serving more than 44 million passengers annually. In addition to commercial flights, numerous general aviation and military aircraft operate in the greater Washington area, which makes the capital region one of the busiest airspaces in the country. In addition to operating both airports, the Airports Authority oversees two key regional transportation programs: the design and construction of the Metrorail Silver Line extension and the operation and maintenance of the Dulles Toll Road. Although air travel is an essential element of the metropolitan Washington economy, aircraft noise can disturb residents living near flight paths, particularly during early morning and late-night hours. This is especially true in densely populated neighborhoods adjacent to Reagan National s flight paths along the Potomac and Anacostia Rivers and housing developments constructed near Dulles International s runways. 3

5 Introduction Continued Recently, Reagan National and Dulles International have experienced an increase in aircraft noise complaints; subsequently, several key factors have been identified: Reagan National - Increased Travel Demand: An increase in demand for early morning and late-night travel has resulted in more arrivals and departures between 10 p.m. and 7 a.m. The change has prompted additional complaints from residents who live near the flight paths in Washington, D.C., Maryland and Virginia. Dulles International Encroaching Housing Developments: An increase in housing construction near flight paths and runways has resulted in additional complaints from residents. D.C. Metroplex - Procedure Changes: FAA continues the implementation of its nationwide Next Generation Air Transportation System program (NextGen) to improve airspace safety and efficiency. Procedure changes in the D.C. airspace (D.C. Metroplex) have resulted in additional noise complaints from residents near Reagan National and Dulles International. The Airports Authority operates a Noise Information Office to provide noise-related information, record noise complaints and explain the facts, science and regulations. When public concerns arise over these issues, the Airports Authority s management and Noise Information Office may meet with individuals, groups, elected officials, airline representatives and the FAA to discuss airport operations and potential mitigation measures. In 2016, the Airports Authority continued to work with the FAA, airlines and community stakeholders to provide information and help identify procedures that may potentially mitigate aircraft noise in neighborhoods near Reagan National and Dulles International airports. The 2016 Annual Aircraft Noise Report includes information related to these efforts as well as flight operations, noise monitoring data and complaint statistics. The Airports Authority does not control or regulate airspace, aircraft operations, aircraft noise levels, airline schedules, airline fleet mix or local land-use zoning. The federal government has exclusive sovereignty of U.S. airspace. The only federal restrictions imposed on commercial aircraft operating over populated neighborhoods include: o Minimum Altitudes: This restriction does not apply to arriving and departing aircraft. o Federal Prohibited Airspace: White House, U.S. Naval Observatory and U.S. National Mall. The Federal Aviation Administration is solely responsible for managing the National Airspace System including all aircraft flight paths and altitudes. The Airport Noise and Capacity Act of 1990 limits U.S. airports from imposing new noise-based operational restrictions on quieter (stage 3) aircraft, including limits on airport hours of operation, number of aircraft operations or aircraft noise levels. Airlines are responsible for managing their individual flight schedules and aircraft fleet mix. Local government jurisdictions are responsible for all land-use zoning around airports. 4

6 Introduction Continued For more information about the Airports Authority and aircraft noise, please visit: MWAA Reagan National Dulles International Disclaimer: The 2016 Annual Aircraft Noise Report is provided as a public resource for general information only. The Noise Information Office strives to provide accurate data; however, because of the large quantity of processed data, the Airports Authority shall assume no liability for: 1. Any errors, omissions, or inaccuracies in the information; 2. Any executed/non-executed decisions based on the provided information. 5

7 Reagan National (DCA) Airport Diagram and Information The D.C. airspace is unique within the FAA s National Airspace System because of prohibited airspace (P-56) located 1.5 nautical miles north of Reagan National. The airspace consists of two subareas (Figure 1): Figure 1: Prohibited Airspace, P-56 A/B P-56B P-56A: U.S. National Mall and the White House. P-56B: U.S. Naval Observatory, home of the U.S. Vice President. P-56A The FAA and U.S. Secret Service enforce P-56 and investigate all violations. Penalties may include revocation of the pilot s license and/or jail. At Reagan National, a key strategy for limiting aircraft noise exposure over the broader region is to maximize aircraft movements over water and minimize movements over communities. Arrival and departure procedures generally position aircraft over the Potomac and Anacostia River corridors, while avoiding P-56. Figure 2: Reagan National (DCA) Airport Diagram Another influence on Reagan National operations is FAA s Next Generation Air Transportation System program (NextGen DCA). NextGen s objective is to improve air travel safety and efficiency by redesigning the airspace to reduce delays and fuel consumption, improve the collection and distribution of air traffic data and introduce performance-based satellite navigation. Figure 2 illustrates the FAA s airport diagram for DCA. All aircraft movements are controlled by the FAA, including the operational direction - North Flow or South Flow. As a safety factor, aircraft operate into the wind to maximize aerodynamic lift. FAA uses Air Traffic Control reports, pilot observations, and National Weather Service data to determine airfield and enroute wind/weather conditions as the primary basis for directional flow. 6

8 Reagan National (DCA) Runway Utilization During 2016, Runway 4/22 re-opened after the completion of scheduled runway safety area improvements. There were no significant changes in runway utilization after re-opening. Figures 3 4 provide approximate arrival and departure runway utilization percentages. Figure 3: DCA Runway Utilization - Arrivals Figure 4: DCA Runway Utilization - Departures 1.0% Arr RW % Arr RW % Dep RW % Dep RW % Arr RW % Dep RW % Arr RW % Dep RW15 0% Arr RW % Arr RW1 0% Dep RW % Dep RW19 7

9 Reagan National (DCA) FAA D.C. Metroplex Routes: Standard Arrivals and Standard Instrument Departures FAA D.C. Metroplex routes for DCA Standard Arrivals (STARs - blue) and Standard Instrument Departures (SIDs - red) (Figures 5 6) are FAA computer-modeled flight routes for Reagan National. Actual flight corridors associated with the modeled routes will be wider because of the number of flights operating on the routes, pilot technique, aircraft type, weather, FAA Flight Standards safety criteria, FAA Air Traffic instructions etc. Figure 5: DCA North Flow STARs AND SIDs 1 Figure 6: DCA South Flow STARs AND SIDs 1 1 Source: FAA, PBN Programs and Policy Group, 09 Mar

10 Reagan National (DCA) Typical Daily Flight Track Map On a typical day, approximately 4,000 aircraft operate in the metropolitan Washington airspace. Aircraft operate to/from more than a dozen airfields including commercial, general aviation and military: Commercial: Reagan National, Dulles International, Baltimore-Washington International General Aviation: College Park, Leesburg Executive, Manassas Regional, Montgomery Air Park Military: Andrews Air Force Base, Ft. Belvoir-Davidson Army Airfield, Joint Base Anacostia-Bolling, Quantico Marine Corps Airfield In 2016, Reagan National experienced a daily average of arrivals and departures. Figure 7 depicts typical, mixed flow Reagan National arrivals (blue) and departures (red) during a 24-hour period. Overflights (green) are aircraft operating in the airspace but not at Reagan National. Figure 7: DCA Typical Daily (24-hour), Mixed Flow Operations DCA October 12, 2016: Arrivals (450), Departures (446), Overflights (3,157) 2016 mwaa.com 9

11 Reagan National (DCA) Quarterly Track Density Plots A Track Density Plot graphically illustrates the frequency of aircraft movements over a defined area during a specified time period. It is an effective method to show arrival and departure corridors, or changes in flight procedures. A regional grid map is defined and each grid is color-coded based on the number of times (frequency) an aircraft passed through that grid (Figure 8). On the following pages, Figures 9 16 show 2016 Quarterly Track Density Plots for Reagan National arrivals and departures: Figures 9 12: Arrivals Figures 13 16: Departures Figure 8: Track Density Grid Colors based on Aircraft Frequency Count 10

12 Reagan National (DCA) Quarterly Track Density Plots 2016 Arrivals Aircraft Frequency Count Figure 9: 1st Quarter Figure10: 2nd Quarter Figure 11: 3rd Quarter Figure 12: 4th Quarter 2016 mwaa.com 11

13 Reagan National (DCA) Quarterly Track Density Plots 2016 Departures Aircraft Frequency Count Figure 13: 1 st Quarter Figure 14: 2 nd Quarter Figure 15: 3rd Quarter Figure 16: 4 th Quarter 12

14 Daily Average Reagan National (DCA) Daily Average Operations by Hour In 2016, Reagan National experienced a daily average of arrivals and departures. Figure 17 provides the daily average arrival and departure counts by hour. Figure 17: DCA Daily Average Operations by Hour 60 DCA 2016 Average Daily Arrivals and Departures by Hour a 1a 2a 3a 4a 5a 6a 7a 8a 9a 10a 11a 12p 1p 2p 3p 4p 5p 6p 7p 8p 9p 10p 11p Arrivals Departures Hour 13

15 Aircraft Type Reagan National (DCA) Aircraft Fleet Mix The Airports Authority maintains an open dialog with all airlines operating at Reagan National and encourages them to operate quieter aircraft types. Certified aircraft noise levels are published in FAA Advisory Circular 36-3H. Figures show the average annual fleet mix percentages by aircraft type. Figure 18: DCA Annual Average Fleet Mix by Aircraft Type Aircraft Type Aircraft Category A319 Narrowbody Jet 12.3% 11.9% 11.3% 9.9% A320 Narrowbody Jet 6.1% 5.0% 4.4% 4.2% A321 Narrowbody Jet 0.9% 0.3% 0.7% 1.8% B Narrowbody Jet 2.5% 1.8% 0.3% 0.7% B Narrowbody Jet 0.0% 0.2% 0.1% 0.0% B Narrowbody Jet 2.0% 5.2% 10.5% 11.2% B Narrowbody Jet 7.8% 9.1% 10.0% 8.5% B Narrowbody Jet 1.3% 1.0% 0.6% 0.6% B Narrowbody Jet CL60 Regional Jet Not Available Not Available Not Available 0.0% 0.3% Not Available 11.0% 5.2% CRJ2 Regional Jet 22.7% 21.4% 8.8% 12.1% CRJ7 Regional Jet 1.3% 1.6% 2.5% 6.9% CRJ9 Regional Jet 1.8% 1.7% 1.7% 3.0% DH8A Turboprop 1.5% 1.2% 0.6% 0.5% DH8D Turboprop 0.5% 0.6% 0.4% 0.0% E135 Regional Jet 3.4% 1.4% 0.2% 0.0% E145 Regional Jet 2.9% 1.7% 1.5% 1.9% E170 Regional Jet 20.8% 22.8% 19.5% 18.9% E190 Regional Jet 4.0% 6.2% 9.2% 8.8% E45X Regional Jet 0.2% 0.5% 0.8% 0.7% GLF4 General Aviation 0.1% 0.1% 0.2% 0.1% GLF5 General Aviation 0.1% 0.0% 0.1% 0.2% JS32 Turboprop 0.2% 0.2% 0.2% 0.2% MD82 Narrowbody Jet 1.5% 0.8% 0.0% 0.0% MD83 Narrowbody Jet 0.5% 0.2% 0.0% 0.0% MD88 Narrowbody Jet 2.2% 1.3% 1.7% 1.4% Figure 19: DCA Top 25 Fleet Mix F900 F2TH E75L GLF4 GLF5 JS32 B DH8A B E45X B MD88 A321 E145 MD90 CRJ9 A320 CL60 CRJ7 B E190 A319 B CRJ2 E % 0.1% 0.1% 0.1% 0.2% 0.2% 0.3% 0.5% 0.6% 0.7% 0.7% 1.4% DCA 2016 Top 25 Aircraft Types 1.8% 1.9% 2.1% 3.0% 4.2% 5.2% 6.9% 8.5% 8.7% 10.0% 11.2% 12.1% 18.9% 0% 5% 10% 15% 20% 25% Annual Average Fleet Mix Percentage MD90 Narrowbody Jet 2.0% 2.5% 2.1% 2.1% 14

16 Reagan National (DCA) Aircraft Fleet Mix - Continued Figure 20: DCA 2016 Annual Fleet Mix General Aviation 0.9% Turboprops 0.8% DCA 2016 Annual Fleet Mix Narrow-body Jets 40.7% Regional Jets 57.5% Narrow-body Jets 40.7% Regional Jets 57.5% General Aviation 0.9% Turboprops 0.8% 15

17 Operation Counts Operation Counts Reagan National (DCA) DCA Nighttime Noise Rule History Since 1941, Reagan National has operated as a commercial airfield, 24 hours a day, seven days a week. It is important to note that an operational curfew has never existed at Reagan National. By late 1981, louder aircraft operating at Reagan National prompted the airport operator at that time, the FAA, to impose nighttime noise restrictions between 10 p.m. and 6:59 a.m. based on aircraft noise certification levels. The restrictions became known as the DCA Nighttime Noise Rule. In 1987, the U.S. Congress established the Metropolitan Washington Airports Authority to operate Reagan National and Dulles International airports on behalf of the federal government. The operational transfer included the DCA Nighttime Noise Rule, which superseded the Airport Noise and Capacity Act of 1990*. While few regulations currently exist related to aircraft noise, the DCA Nighttime Noise Rule remains in effect. * The Airport Noise and Capacity Act of 1990: A federal regulation that required all U.S. aircraft operators modernize their fleet to comply with quieter (stage 3) aircraft noise standards by December 31, Limits U.S. airports from imposing new noise-based operational restrictions on quieter (stage 3) aircraft. As of October 1, 1990, airports are limited from implementing restrictions on: Airport hours of operation Number of stage 3 operations Single event or cumulative aircraft noise levels The DCA Nighttime Noise Rule is not an operational curfew. The DCA Nighttime Noise Rule is a regulation that enables the Airports Authority to levy penalties on non-compliant (louder) aircraft that operate during nighttime hours. It defines: Compliant and non-complaint (louder) aircraft based on published FAA noise certification data for each aircraft. Guidelines for imposing civil penalties on airlines/operators for operating non-compliant aircraft. When it was implemented, only a few aircraft complied with the DCA Nighttime Noise Rule. Some residents incorrectly interpreted the lack of nighttime operations as a curfew. However, aviation technology has improved since 1981, and the majority of modern aircraft now comply with the DCA Nighttime Noise Rule. Figures provide the average number of daily arrivals and departures during early morning and late-night hours. Changes in operations are the result of airlines operating compliant aircraft to meet the demand for early morning and late-night travel. Figure 21: DCA Operations 5 a.m. 7 a.m. Figure 22: DCA Operations 10 p.m. 1 a.m. 60 DCA Average Daily Counts by Operation Type (5 a.m. - 7 a.m.) 60 DCA Average Daily Counts by Operation Type (10 p.m. - 1 a.m.) Year Year Arrivals Departures Arrivals Departures 16

18 Reagan National (DCA) DCA Nighttime Noise Rule Enforcement Policy The DCA Nighttime Noise Rule is based on aircraft noise measurements obtained during the FAA s Noise Certification process for each aircraft type, model, engine type and weight. Aircraft noise certification data is published in FAA Advisory Circular 36-3H, Estimated Airplane Noise Levels in A-Weighed Decibels. There are no federal regulations that limit in-flight aircraft noise levels after the Airport Noise and Capacity Act of 1990 federally mandated a quieter (all stage 3) U.S. aircraft fleet by December 31, Federal regulations prohibit the use of operational in-flight aircraft noise measurements obtained outside the FAA s noise certification process to enforce the DCA Nighttime Noise Rule. Consequently, the Airports Authority s noise monitoring data is only a public information resource with no regulatory use. The data cannot be used to audit, investigate or enforce the DCA Nighttime Noise Rule, or any other rule or regulation. FAA Noise Certification Process: During certification test conditions, as defined in Federal Aviation Regulation Part 36 Noise Standards: Aircraft Type and Airworthiness Certification, noise measurements are required at specific approach and departure locations (Figure 23): Approach: 2,000 meters from runway threshold Takeoff: 6,500 meters from start of takeoff roll Figure 23: FAA Aircraft Noise Certification Measurement Points DCA Nighttime Noise Rule compliant aircraft are solely determined by FAA noise certification levels (not operational, in-flight aircraft noise levels) that are equal or less than: Approach: 85 db(a) Takeoff: 72 db(a) 17

19 Reagan National (DCA) DCA Nighttime Noise Rule Violations The Airports Authority administers and enforces the DCA Nighttime Noise Rule to ensure aircraft are in compliance. Non-compliant aircraft may be fined a civil penalty up to $5,000 per violation by the Airports Authority. In 2016, Reagan National recorded 29 DCA Nighttime Noise Rule violations (Figure 24). Most violations were related to heavier (non-compliant) aircraft weights operating during the nighttime hours: Figure 24: DCA Nighttime Violations 2016 DCA Nighttime Noise Rule Violations Airline # of Violations Total of Accessed Civil Penalties American 22 $110,000 Delta 4 $20,000 United 3 $15,000 Total 29 $145,000 18

20 Reagan National (DCA) Noise Monitor Program The Airports Authority operates a network of noise monitors around Regan National and Dulles International. The first noise monitors were installed around Reagan National in 1978 when the FAA operated the airport. At Reagan National, a key strategy for limiting aircraft noise exposure has been to maximize aircraft movements over water and minimize movements over densely populated communities. After consultation with the Metropolitan Washington Council of Governments, many of the noise monitors have been sited along the flight corridors near the Potomac and Anacostia Rivers to track historical noise trends. Under FAA regulations, noise monitor data may not be used for regulatory or enforcement purposes. The Airports Authority continues to voluntarily upgrade and maintain the noise monitors around Reagan National without any external funding. The noise monitors provide aircraft and community noise levels near Reagan National as a public resource for general information only. Federal law prohibits the use of noise monitor data to audit, investigate or enforce the DCA Nighttime Noise Rule, or any other rule or regulation. Noise Monitors and Noise Event Detection Criteria: Traditional Noise Event Detection Methodology: Prior to 2015, the Airports Authority s noise monitors detected a noise event when the noise level exceeded a noise threshold for a minimum duration. During noise data post-processing, only detected noise events were correlated against aircraft position data. The traditional methodology had technological challenges: Quieter aircraft commonly generated noise levels that did not satisfy the noise event threshold criteria. Aircraft noise events could easily be contaminated by community noise sources (traffic, sirens, lawn mowers, construction, community activities, nature weather, animals). Lowering the noise event detection threshold did not account for increased background noise levels. ANEEM - Aircraft Noise Event Extraction Methodology: As of 2015, the Airports Authority was the first U.S. airport system to upgrade its noise monitoring software using a new noise event detection methodology called ANEEM (Aircraft Noise Event Extraction Methodology), provided by Bruel & Kjaer EMS. ANEEM does not solely rely on the noise monitor to detect a noise event. During noise data postprocessing, ANEEM cross-references databases to identify aircraft in the vicinity of the noise monitor when the noise level rises above the background level. It identifies and correlates aircraftdominated noise events by comparing aircraft position data with predicted noise levels for that aircraft, using FAA noise certification data. ANEEM provides a more accurate detection methodology for distinguishing aircraft noise from other noise sources experienced in neighboring communities. It is very important to clarify that the total noise experienced at a noise monitor is unaffected by the choice of a noise event detection methodology. ANEEM only improves the accuracy of the noise source classification process. ANEEM noise event counts will be higher because ANEEM accounts for quieter aircraft and higher background noise levels. However, the total noise experienced at the noise monitor is consistent with legacy software. 19

21 Reagan National (DCA) Noise Monitor Locations Figure 25: Reagan National Noise Monitor Locations Reagan National has 15 noise monitors positioned along flight corridors (Figure 25). NMT NMT Name Address City ST Zip Jurisdiction 2 Cabin John th St Cabin John MD Montgomery 3 Langley Forest 6737 Sorrell St McLean VA Fairfax 4 Potomac Palisades 5334 Carolina Pl NW Washington DC DC 5 Chain Bridge th Rd N Arlington VA Arlington 6 Georgetown Georgetown Visitation School th St NW Washington DC DC 7 Rosslyn 2220 N Rolfe St Arlington VA Arlington 8 Old Town Founder's Park 499 N Union St Alexandria VA City of Alexandria 9 Springfield 6414 Meriwether Ln Springfield VA Fairfax 10 Fort Foote FAA Communications Site Fort Foote Rd Ft Washington MD Pr. George's 11 Marlan Forest 1219 Warrington Pl Alexandria VA Fairfax 12 Tantallon W Tantallon Dr Ft Washington MD Pr. George's 17 Southwest DC 19 North Mt. Vernon Fort McNair Army Base th St SW Carl Sandburg School 8428 Fort Hunt Rd Washington DC DC Alexandria VA Fairfax 20 Dumbarton 3910 N Dumbarton St Arlington VA Arlington 22 Avenel Avenel Equestrian Center Oaklyn Dr Potomac MD Montgomery 20

22 Reagan National (DCA) Noise Monitor Data As noted on Page 19, the Airports Authority upgraded its noise monitoring software to include a new noise event detection process called Aircraft Noise Event Extraction Methodology (ANEEM). ANEEM classifies aircraft, community and mixed noise events based on available aircraft position and flight plan data. Although ANEEM improves the noise source classification process, a noise event may occasionally be misclassified due to limited aircraft data. The monthly noise event data provides the following noise classifications and metrics: Noise Monitor # Year % Time Total Leq Online D NL Leq # Events Aircraft Min Modal Min Leq # Events Community Modal Min Leq # Events Mixed Modal Background (non-event) Leq Noise Classification Descriptions: Aircraft: Noise events correlated with aircraft position data. Community: Noise events without correlated aircraft position data. Mixed: Noise events attributed to correlated aircraft and community noise. Background: Environmental noise not associated with aircraft or community noise. Noise Event Metric and Table Header Descriptions: Aircraft DNL: A cumulative exposure metric that logarithmically calculates the average Aircraft db(a) level over a 24-hour period, with a 10 db penalty artificially applied to aircraft noise events occurring during nighttime hours (22:00-06:59). The 10 db penalty is equivalent to replacing 1 nighttime aircraft noise event with 10 nighttime aircraft noise events. db(a): A-weighted decibel scale that adjusts (weights) low frequency ranges to model the response perceived by the human ear. Leq: For Each Noise Classification: A cumulative exposure metric that logarithmically averages the varying sound energy over a defined period of time (month), and states it as a constant (equivalent) level for each noise classification type. : A single event noise metric that represents the maximum (peak) db(a) level during a discrete noise event. Monthly peak levels are represented as: Min (lowest peak), Modal (most common whole # peak), (highest peak) Total Leq: For All Noise Classifications: A cumulative exposure metric that logarithmically averages the varying sound energy over a defined period of time (month), and states it as a constant (equivalent) level for all noise classifications. # Events: Number of noise events during the month for each noise classification type. % Time Online: Percent of the month that the noise monitor was operational. For noise event comparisons at a noise monitor location, the 2016 report provides: *Leq for direct comparison of non-penalized aircraft, community, mixed and background noise. **Aircraft DNL Only since the 10 db penalty is only applied to aircraft noise events (22:00 06:59). 21

23 Reagan National (DCA) Noise Monitor Data - Continued Noise data may not always be available for a specific site because of technical issues associated with the noise monitoring equipment, software anomalies, power, communications, site construction, vandalism and other factors. Noise Monitor # 2016 % Time Online Total Leq D NL Leq # Events Aircraft Min Modal Leq # Events Community Min Modal Leq # Events Min Modal Background (non-event) 2 Jan , , Feb , , Mar , , Apr , , May , , Jun , , Jul , , Aug , , Sep , , Oct , , Nov , , Dec , , Jan , , Feb , , Mar , , Apr , , May , , Jun , , Jul , , Aug , , Sep , , Oct , , Nov , , Dec , , Jan , , Feb , , Mar , , Apr , , May , , Jun , , Jul , , Aug , , Sep , , Oct , , Nov , , Dec , , Jan , , Feb , , Mar , , Apr , , May , , Jun , , Jul , , Aug , , Sep , , Oct , , Nov , , Dec , , Mixed Leq 22

24 Reagan National (DCA) Noise Monitor Data - Continued Noise Monitor # 2016 % Time Online Total Leq D NL Leq # Events Aircraft Min Modal Leq # Events Community Min Modal Leq # Events Min Modal Background (non-event) 6 Jan , , Feb , , Mar , , Apr , , May , , Jun , , Jul , , Aug , , Sep , , Oct , , Nov , , Dec , , Jan , , Feb , , Mar , , Apr , , May , , Jun , , Jul , , Aug , , Sep , , Oct , , Nov , , Dec , , Jan , , Feb , , Mar , , Apr , , May , , Jun , , Jul , , Aug , , Sep , , Oct , , Nov , , Dec , , Jan , , Feb , , Mar , , Apr , , May , , Jun , , Jul , , Aug , , Sep , , Oct , , Nov , , Dec , , Mixed Leq 23

25 Reagan National (DCA) Noise Monitor Data - Continued Noise Monitor # 2016 % Time Online Total Leq D NL Leq # Events Aircraft Min Modal Leq # Events Community Min Modal Leq # Events Min Modal Background (non-event) 10 Jan , , Feb , , Mar , , Apr , , May , , Jun , , Jul , , Aug , , Sep , , Oct , , Nov , , Dec , , Jan , , Feb , , Mar , , Apr , , May , , Jun , , Jul , , Aug , , Sep , , Oct , , Nov , , Dec , , Jan , , Feb , , Mar , , Apr , , May , , Jun , , Jul , , Aug , , Sep , , Oct , , Nov , , Dec , , Jan , , Feb , , Mar , , Apr , , May , , Jun , , Jul , , Aug , , Sep , , Oct , , Nov , , Dec , , Mixed Leq 24

26 Reagan National (DCA) Noise Monitor Data - Continued Noise Monitor # 2016 % Time Online Total Leq D NL Leq # Events Aircraft Min Modal Leq # Events Community Min Modal Leq # Events Min Modal Background (non-event) 19 Jan , , Feb , , Mar , , Apr , , May , , Jun , , Jul , , Aug , , Sep , , Oct , , Nov , , Dec , , Jan , , Feb , , Mar , , Apr , , May , , Jun , , Jul , , Aug , , Sep , , Oct , , Nov , , Dec , , Jan , , Feb , , Mar , , Apr , , May , , Jun , , Jul , , Aug , , Sep , , Oct , , Nov , , Dec , , Mixed Leq 25

27 Reagan National (DCA) Noise Complaint Statistics In 2016, the Airports Authority received 36,653 complaints from 836 individuals (762 households) that were associated with Reagan National (Figures 26 28). The majority of individuals (51.3%) submitted one complaint. Figure 26: DCA 2016 Complaint Statistics Figure 27: DCA 2016 Complaints - Top 5 Individuals Washington City DC Quad # of Households # of Individuals # of Complaints NW ,563 SW Total ,571 Individuals 1 & 3* DCA 2016 Complaints Top 5 Individuals vs. All Other Individuals VA City # of Households # of Individuals # of Complaints City of Alexandria Alexandria (Fairfax County) ,473 Arlington ,099 Burke Fairfax Fairfax Station Falls Church Great Falls McLean Springfield 7 8 1,201 Vienna Total ,094 Individual 2 Individual 4 Individual 5 All Other DC Individuals All Other VA Individuals All Other MD Individuals * Same Residence 6.5% 1 DC NW Resident (Foxhall) Individual 2 = 2,384 Complaints 3.9% 1 DC NW Resident (Palisades) Individual 4 = 1,436 Complaints 3.% 1 VA Alexandria Resident (Fairfax County) Individual 5 = 1,101 Complaints MD City # of Households # of Individuals # of Complaints Accokeek Beltsville Bethesda Cabin John Dickerson Fort Washington La Plata Oxon Hill Potomac Temple Hills Waldorf Total % 9.8% All Other DC Individuals 3,605 Complaints 21.8% All Other VA Individuals 7,993 Complaints 2.7% All Other MD Individuals 988 Complaints DCA Grand Total Total # of Total # of Total # of Households Individual Complaints , % 1 DC NW Residence (Foxhall)* 2 Individuals: Individual 1 = 17,273 Complaints Individual 3 = 1,873 Complaints 26

28 Reagan National (DCA) Noise Complaint Statistics - Continued Figure 28: DCA 2016 Complaint Statistics Complaints per Individual # of Individuals # of Complaints % of All Individuals % of All Complaints % 1.2% % 0.6% % 0.5% % 0.5% % 0.2% % 0.2% % 0.2% % 0.2% % 0.2% % 0.1% % 0.2% % 0.1% % 0.2% % 0.2% % 0.3% % 0.1% % 0.3% % 0.2% % 0.1% % 0.2% % 0.1% % 0.1% % 0.3% % 0.1% % 0.3% % 0.1% % 0.4% % 0.1% % 0.3% % 0.2% % 0.2% % 0.3% % 0.1% % 0.2% % 0.1% % 0.1% % 0.1% % 0.1% % 0.1% % 0.1% % 0.1% % 0.2% % 0.2% % 0.2% 27

29 Reagan National (DCA) Noise Complaint Statistics - Continued Figure 28 - Continued: DCA 2016 Complaint Statistics Complaints per Individual # of Individuals # of Complaints % of All Individuals % of All Complaints % 0.2% % 0.2% % 0.2% % 0.2% % 0.4% % 0.2% % 0.2% % 0.2% % 0.3% % 0.3% % 0.3% % 0.4% % 0.5% % 0.5% % 0.5% % 0.5% % 0.5% % 0.6% % 0.6% % 0.7% % 0.7% % 0.7% % 0.8% % 0.8% % 0.8% % 0.9% % 1.3% % 1.9% % 1.9% % 2.0% % 2.3% 1, , % 2.9% 1, , % 3.0% 1, , % 3.9% 1, , % 5.1% 2, , % 6.5% 17, , % 47.1% 28

30 Reagan National (DCA) Community Noise Working Group A Reagan National Community Noise Working Group was established in October 2015, in cooperation with the FAA, to engage broad-based stakeholder participation to identify practical aircraft noise mitigation measures and to formulate mitigation recommendations to the FAA for its consideration. The 2016 Working Group was comprised of Reagan National stakeholders representing regional communities along the Potomac and Anacostia river corridors, as well as airlines serving the airport. The Working Group voting members included 12 community representatives, appointed by their local elected officials, and two airline representatives. For 2017, the Working Group will include additional community members from Montgomery and Prince George s Counties in Maryland. Airlines: American Airlines, Metropolitan Washington Airlines Committee D.C.: Wards 2, 3, 6, 7, 8 Maryland: Montgomery County - District 1, Prince George s County - District 8 Virginia: Arlington County - North and South, City of Alexandria, Fairfax County - Dranesville and Mount Vernon Districts The Airports Authority serves as the facilitator for Working Group meetings and recommendations. The Airports Authority and FAA serve as non-voting, advisory Working Group members. The Airports Authority forwards recommendations to the FAA for consideration after they have been approved and endorsed by a Working Group majority Working Group Focus Areas: D.C. Metroplex Operations: o Runway 1: North Flow LAZIR-B Proposed FAA Modifications o Runway 19: RNAV GPS Approach Procedure Feasibility and Implementation o South Flow Standard Instrument Departures and Standard Arrivals o NextGen s Channelization of Arrival and Departure Procedures Airline Fleet Mix Operations Data Comparison for Reagan National, Dulles International and Baltimore- Washington International Day-Night (DNL) Noise Levels 2016 Working Group Recommendations to FAA and Status as of July 1, 2017: Recommendation #2*: Develop a feasibility plan, and an associated implementation plan, for a new, Area Navigation (RNAV) Approach Procedure to Runway 19 with the goal of maximizing the time aircraft spend flying directly over the Potomac River and minimizing the time aircraft spend flying over land. o Status: Regular Meeting Summary (12), 27 Apr 2017 FAA developed a prototype RNAV (GPS) Approach Procedure to Runway 19. Working Group requested baseline environmental data prior to issuing a consensus needed by the FAA to begin the environmental/safety review process. 29

31 * Recommendation #1was approved in 2015, see page 8. Reagan National (DCA) Community Noise Working Group - Continued Recommendation #3: Endorse the concept of FAA modifying flight paths south of Reagan National to keep aircraft more centered over the Potomac River on departures, as well as modifying waypoints to move departing aircraft farther down the Potomac River before turning east or west. o Status: Regular Meeting Summary (13), 25 May 2017 FAA developed a prototype South Flow Standard Instrument Departure procedure that received a DCA Working Group consensus to establish a formal FAA Performance-Based Navigation (PBN) working group to continue procedure development. An FAA PBN working group kick-off is expected by early fall 2017 and will include local community outreach. A procedure publication goal is months. Recommendation #4: Recommend the FAA modify flight paths, including possible waypoint adjustments, along South Flow departure routes from Reagan National with the goal of maximizing the time aircraft spend flying directly over the Potomac River and minimizing the time aircraft spend flying over land in communities south of the airport, especially neighborhoods, as a way to mitigate the impact of aircraft noise. Recommend relocating the turning point for aircraft heading west off the river farther south along the Potomac River to minimize flights over residential areas and at a location where aircraft have reached the highest practical altitudes, consistent with the FAA s study of operational considerations. Recommend the FAA engage in outreach to communities that could be impacted by modifications in flight paths or procedures resulting from this recommendation. o Status: Regular Meeting Summary (13), 25 May 2017 FAA developed a prototype South Flow Standard Instrument Departure procedure that received a DCA Working Group consensus to establish a formal FAA Performance-Based Navigation (PBN) working group to continue procedure development. An FAA PBN working group kick-off is expected by early fall 2017 and will include local community outreach. A procedure publication goal is months. Recommendation #5: Recommend MWAA fund and conduct a study to develop new Reagan National DNL contours from 65 to 50 DNL, in 5 db increments. o Status: Regular Meeting Summary (11), 16 Feb 2017 Airports Authority and Ricondo & Associates presented noise monitor data for the seven monitors closely aligned along the Potomac River. Generalized findings were presented for Overall Noise Levels, Noise Events and Individual Aircraft Noise Levels. 30

32 Reagan National (DCA) Community Noise Working Group - Continued Recommendation #6: North Flow Departures: Recommend FAA develop a departure procedure, including waypoint adjustments and establishment of minimum waypoint altitudes, which centers aircraft over the Potomac River from the Maryland State Line to at least the American Legion Bridge. Recommend maximizing altitudes before aircraft are permitted to turn east or west, thus minimizing the amount of time aircraft overfly communities located adjacent or near the Potomac River, as a way to mitigate existing aircraft noise impacts on residents. o Status: Pending Recommendation #7: South Flow Arrivals: Recommend FAA develop an approach procedure, including waypoint adjustments and establishment of minimum waypoint altitudes, which centers aircraft over the Potomac River from the Maryland State Line to at least the American Legion Bridge. Recommend maximizing altitudes before aircraft are permitted to turn east or west, thus minimizing the amount of time aircraft overfly communities located adjacent or near the Potomac River, as a way to mitigate existing aircraft noise impacts on residents. o Status: Pending Previous Recommendations to FAA: Recommendation #1: Adjust navigational waypoints along LAZIR flight path procedure with the goal of maximizing the time aircraft spend flying directly over the Potomac River and minimizing the time aircraft spend flying over land. Proposed LAZIR Option B, presented by the FAA to the Working Group, was determined to be the most viable alternative. o Status: Regular Meeting Summary (11), 16 Feb 2017 FAA suspended LAZIR-B procedure Development based on the volume of negative public comments received during the FAA s September 2016 Public Workshops conducted in Washington, D.C., Maryland and Virginia. 31

33 Dulles International (IAD) Airport Diagram and Information Figure 29: Dulles International (IAD) Airport Diagram Dulles International operations are influenced by FAA s Next Generation Air Transportation System program (NextGen IAD). NextGen s objective is to improve air travel safety and efficiency by redesigning the airspace to reduce delays and fuel consumption, improve the collection and distribution of air traffic data and introduce performance-based satellite navigation. Figure 29 illustrates the FAA s airport diagram for IAD. All aircraft movements are controlled by the FAA, including the operational direction - North Flow or South Flow. As a safety factor, aircraft operate into the wind to maximize aerodynamic lift. FAA uses Air Traffic Control reports, pilot observations and National Weather Service data to determine airfield and enroute wind/weather conditions as the primary basis for directional flow. 32

34 Dulles International (IAD) Runway Utilization Figures provide approximate 2016 arrival and departure runway utilization percentages. Figure 30: IAD Runway Utilization - Arrivals Figure 31: IAD Runway Utilization - Departures 1.3% Arr RW19R 21.7% Arr RW19C 0% Dep RW1L 5.0% Dep RW1C 19R 19C 19R 19C 17.5% Arr RW19L 8.9% Dep RW1R 19L 19L 0.3% Arr RW L 1C 72.0% Dep RW L 1C 1.1% Arr RW1L % Arr RW30 0% Dep RW19R % Dep RW % Arr RW1C 1R 30.1% Arr RW1R 2.6% Dep RW19C 1R 11.4% Dep RW19L 33

35 Dulles International (IAD) FAA D.C. Metroplex Routes: Standard Arrivals and Standard Instrument Departures FAA D.C. Metroplex routes for IAD Standard Arrivals (STARs - blue) and Standard Instrument Departures (SIDs - red) (Figures 28 29) are FAA computer-modeled flight routes for Dulles International. Actual flight corridors associated with the modeled routes will be wider because of the number of flights operating on the routes, pilot technique, aircraft type, weather, FAA Flight Standards safety criteria, FAA Air Traffic instructions etc. Figure 28: IAD North Flow STARs AND SIDs 1 Figure 29: IAD South Flow STARs AND SIDs 1 1 Source: FAA, PBN Programs and Policy Group, 09 Mar

36 Dulles International (IAD) Typical Daily Flight Track Map On a typical day, approximately 4,000 aircraft operate in the metropolitan Washington airspace. Aircraft operate to/from more than a dozen airfields including commercial, general aviation and military: Commercial: Reagan National, Dulles International, Baltimore-Washington International General Aviation: College Park, Leesburg Executive, Manassas Regional, Montgomery Air Park Military: Andrews Air Force Base, Ft. Belvoir-Davidson Army Airfield, Joint Base Anacostia-Bolling, Quantico Marine Corps Airfield In 2016, Dulles International experienced a daily average of arrivals and departures. Figure 32 depicts typical 2016 Dulles International arrivals (blue) and departures (red) during a 24-hour period. Overflights (green) are aircraft operating in the airspace but not at Dulles International. Figure 32: IAD Typical Daily (24-hour), Mixed Flow Operations IAD 09/27/2016: Arrivals (468), Departures (457), Overflights (2,980) 2016 mwaa.com 35

37 Dulles International (IAD) Quarterly Track Density Plots A Track Density Plot graphically illustrates the frequency of aircraft movements over a defined area during a specified time period. It is an effective method to show arrival and departure corridors, or changes in flight procedures. A regional grid map is defined and each grid is color-coded based on the number of times (frequency) an aircraft passed through that grid (Figure 34). On the following pages, Figures show 2016 Quarterly Track Density Plots for Dulles International arrivals and departures: Figures 35 38: Arrivals Figures 39 42: Departures Figure 34: Track Density Grid Colors based on Aircraft Frequency Count 36

38 Dulles International (IAD) Quarterly Track Density Plots 2016 Arrivals Aircraft Frequency Count Figure 35: 1 st Quarter Figure 36: 2 nd Quarter Figure 37: 3 rd Quarter Figure 38: 4 th Quarter 37

39 Dulles International (IAD) Quarterly Track Density Plots 2016 Departures Aircraft Frequency Count Figure 39: 1 st Quarter Figure 40: 2 nd Quarter Figure 41: 3 rd Quarter Figure 42: 4 th Quarter 38

40 Daily Average Dulles International (IAD) Daily Average Operations by Hour In 2016, Dulles International experienced a daily average of arrivals and departures. Figure 33 provides the daily average arrival and departure counts by hour. Figure 33: IAD Daily Average Operations by Hour 60 IAD 2016 Average Daily Arrivals and Departures by Hour a 1a 2a 3a 4a 5a 6a 7a 8a 9a 10a 11a 12p 1p 2p 3p 4p 5p 6p 7p 8p 9p 10p 11p Arrivals Departures Hour 39

41 Aircraft Type Dulles International (IAD) Aircraft Fleet Mix The Airports Authority maintains an open dialog with all airlines operating at Dulles International and encourages them to operate quieter aircraft types. Certified aircraft noise levels are published in FAA Advisory Circular 36-3H. Figures show the average annual fleet mix percentages by aircraft type. Figure 43: IAD Annual Average Fleet Mix by Aircraft Type Aircraft Type Aircraft Category A319 Narrow-body Jet 1.6% 1.1% A320 Narrow-body Jet 6.0% 5.0% A321 Narrow-body Jet 0.3% 0.3% A Wide-body Jet 0.4% 0.3% A Wide-body Jet 0.8% 1.1% A Wide-body Jet 0.2% 0.1% A Wide-body Jet 0.2% 0.1% A Wide-body Jet 0.3% 0.5% B350 Turboprop 0.3% 0.4% B Narrow-body Jet 0.6% 0.6% B Narrow-body Jet 2.6% 2.1% B Narrow-body Jet 4.4% 4.9% B Narrow-body Jet 6.3% 7.7% B Wide-body Jet 0.1% 0.2% B747-8 Wide-body Jet 0.3% 0.3% B Narrow-body Jet 2.1% 2.3% B Wide-body Jet 1.6% 1.7% B Wide-body Jet 0.5% 0.7% B Wide-body Jet 3.2% 3.1% B ER Wide-body Jet 1.5% 1.4% B787-8 Wide-body Jet 0.1% 0.2% B787-9 Wide-body Jet 0.2% 0.3% BE20 Turboprop 0.2% 0.2% BE40 General Aviation 0.7% 0.7% C208 General Aviation 0.2% 0.5% C25A General Aviation 0.2% 0.2% C25B General Aviation 0.3% 0.3% C550 General Aviation 0.2% 0.1% C560 General Aviation 0.5% 0.4% C56X General Aviation 1.5% 1.5% C680 General Aviation 0.8% 0.9% C750 General Aviation 0.9% 0.8% CL30 General Aviation 1.3% 1.2% CL60 Regional Jet 1.7% 1.1% CRJ2 Regional Jet 0.3% 0.8% CRJ7 Regional Jet 13.3% 14.1% CRJ9 Regional Jet 2.2% 2.6% DH8B Turboprop 4.1% 5.0% DH8C Turboprop 1.9% 1.7% DH8D Turboprop 0.9% 0.7% E145 Regional Jet 10.4% 2.5% E170 Regional Jet 2.9% 4.4% E190 Regional Jet 1.4% 1.4% E45X Regional Jet 2.5% 6.2% E55P General Aviation 0.6% 0.7% F2TH General Aviation 0.9% 0.9% F900 General Aviation 0.6% 0.6% FA50 General Aviation 0.2% 0.2% G150 General Aviation 0.2% 0.2% GALX General Aviation 0.7% 0.5% GL5T General Aviation 0.2% 0.2% GLEX General Aviation 0.5% 0.6% GLF4 General Aviation 1.1% 1.2% GLF5 General Aviation 0.9% 1.0% H25B General Aviation 1.2% 1.2% LJ31 General Aviation 0.2% 0.2% LJ35 General Aviation 0.2% 0.2% LJ45 Regional Jet 0.6% 0.5% LJ60 General Aviation 0.4% 0.3% MD10 Wide-body Jet 0.4% 0.0% MD82 Narrow-body Jet 0.5% 0.3% MD83 Narrow-body Jet 0.2% 0.5% MD88 Narrow-body Jet 0.6% 1.0% PA31 General Aviation 0.9% 0.5% PC12 Turboprop 0.8% 0.9% SF34 Turboprop 2.4% 2.20% Figure 44: IAD Top 25 Fleet Mix MD88 A319 A CL60 GLF4 CL30 H25B E190 B ER C56X B DH8C B SF34 B E145 CRJ9 B E170 B DH8B A320 E45X B CRJ7 IAD 2016 Top 25 Aircraft Types 1.0% 1.1% 1.1% 1.1% 1.2% 1.2% 1.2% 1.4% 1.4% 1.5% 1.7% 1.7% 2.1% 2.2% 2.3% 2.5% 2.6% 3.1% 4.4% 4.9% 5.0% 5.0% 6.2% 7.7% 14.1% 0% 5% 10% 15% 20% 25% Annual Average Fleet Mix Percentage 40

42 Dulles International (IAD) Aircraft Fleet Mix - Continued Figure 45: IAD 2016 Annual Fleet Mix General Aviation 17.7% Turboprops 11.5% IAD 2016 Annual Fleet Mix Narrow/Wide-body Jets 35.8% Narrow/Wide-body Jets 35.8% Regional Jets 33.6% General Aviation 17.7% Turboprops 11.5% Regional Jets 33.6% 41

43 Dulles International (IAD) Noise Monitor Program The Airports Authority operates a network of noise monitors around Regan National and Dulles International. The first noise monitors were installed around Dulles International in 1978 when the FAA operated the airport. After consultation with the Metropolitan Washington Council of Governments, many of the noise monitors have been sited located along the flight corridors that align with Dulles International runways to track historical noise trends. The Airports Authority continues to voluntarily upgrade and maintain the noise monitors around Dulles International without any external funding. The noise monitors provide aircraft and community noise levels near Dulles International as a public resource for general information only. Under FAA regulations, noise monitor data may not be used for regulatory or enforcement purposes. Noise Monitors and Noise Event Detection Criteria: Traditional Noise Event Detection Methodology: As noted on Page 19, prior to 2015, the Airports Authority s noise monitors detected a noise event when the noise level exceeded a noise threshold for a minimum duration. During noise data post-processing, only detected noise events were correlated against aircraft position data. The traditional methodology had technological challenges: Quieter aircraft commonly generated noise levels that did not satisfy the noise event threshold criteria. Aircraft noise events could easily be contaminated by community noise sources (traffic, sirens, lawn mowers, construction, community activities, nature weather, animals, foliage). Lowering the noise event detection threshold did not account for increased background noise levels. ANEEM - Aircraft Noise Event Extraction Methodology: As of 2015, the Airports Authority was the first U.S. airport system to upgrade its noise monitoring software using a new noise event detection methodology called ANEEM (Aircraft Noise Event Extraction Methodology), provided by Bruel & Kjaer EMS. ANEEM does not solely rely on the noise monitor to detect a noise event. During noise data postprocessing, ANEEM cross-references databases to identify aircraft in the vicinity of the noise monitor when the noise level rises above the background level. It identifies and correlates aircraftdominated noise events by comparing aircraft position data with predicted noise levels for that aircraft, using FAA noise certification data. ANEEM provides a more accurate detection methodology for distinguishing aircraft noise from other noise sources experienced in neighboring communities. It is very important to clarify that the total noise experienced at a noise monitor is unaffected by the choice of a noise event detection methodology. ANEEM only improves the accuracy of the noise source classification process. ANEEM noise event counts will be higher because ANEEM accounts for quieter aircraft and higher background noise levels. However, the total noise experienced at the noise monitor is consistent with legacy software. 42

44 Dulles International (IAD) Noise Monitor Locations Figure 46: Dulles International Noise Monitor Locations Dulles International has 19 noise monitors positioned along flight corridors (Figure 46). NMT NMT Name Address City ST Zip Jurisdiction 13 Broad Run Farms Youngs Cliff Rd Sterling VA Loudoun 14 Arcola (Near 23930) Belmont Ridge Rd Stoneridge VA Loudoun 15 Sterling Guilford Elementary School 600 W Poplar Rd Sterling VA Loudoun 16 Pleasant Valley GC 4715 Pleasant Valley Rd Chantilly VA Fairfax 18 Ashburn ES 21 Sully Station 25 Chantilly 26 Countryside 27 Ashburn 28 Aldie ES 29 Union Mill ES 33 Virginia Run ES 34 Westfield HS 35 Crossfield ES 36 Armstrong ES 37 Mercer MS 38 Briar Woods HS 39 Stone Bridge HS 40 Sycolin Creek ES Ashburn Elementary School Fincastle Dr Cub Run Elementary School 5301 Sully Station Dr Chantilly Post Office 4410 Brookfield Corp Dr Algonkian Elementary School Carter Ct Broad Run High School Ashburn Rd Aldie Elementary School Meetinghouse Ln Union Mill Elementary School Springstone Dr Virginia Run Elementary School Martins Hundred Dr Westfield High School 4700 Stonecroft Blvd Crossfield Elementary School 2791 Fox Mill Rd Armstrong Elementary School Lake Newport Rd Mercer Middle School Greenstone Dr Briar Woods High School Belmont Ridge Rd Stone Bridge High School Hay Rd Sycolin Creek Elementary School Evergreen Mills Rd Ashburn VA Loudoun Centreville VA Fairfax Chantilly VA Fairfax Sterling Park VA Loudoun Ashburn VA Loudoun Aldie VA Loudoun Clifton VA Fairfax Centreville VA Fairfax Chantilly VA Fairfax Herndon VA Fairfax Reston VA Fairfax Aldie VA Loudoun Ashburn VA Loudoun Ashburn VA Loudoun Leesburg VA Loudoun 43