NATIONAL TRANSPORTATION SAFETY BOARD Office of Research and Engineering a^ Washington, D.C *

Transcription

1 NATIONAL TRANSPORTATION SAFETY BOARD Office of Research and Engineering a^ Washington, D.C * February 19, 2002 Flight Path Study - United Airlines Flight 93 A. SUBJECT AIRCRAFT Location: Shanksville, PA Date: September 11, 2001 Time: 10:03 AM Eastern Daylight Time Flight: United Airlines Flight 93 Aircraft: Boeing , registration: N591UA NTSB#: DCA01MA065 B. GROUP N/A C. SUMMARY This document provides a brief description of the flight path of the aircraft based on information obtained from various sources of recorded radar of the subject aircraft both before and after the hijacking events. Information from the Flight Data Recorder (FDR) recovered on scene is also used to develop the description. Flight paths are overlaid onto maps of the area, and time histories of altitude data are presented United Airlines Flight 93 - Flight Profile The following profile of United Airlines Flight 93 is based on data from the flight data recorder (FDR) recovered from the crash site, as well as radar data obtained from the Federal Aviation Administration's Air Route Traffic Control Centers and the U.S. Air Force 84th Radar Evaluation Squadron. Figure 1 shows the flight path of the aircraft from take off at Newark, NJ to the crash site near Johnstown, PA. Figure 2 shows the aircraft's altitude profile for the 1 hour and 21 minute duration of the flight.

2 United flight 93 departed Newark, NJ at 8:42 am (point A in Figures 1 and 2) and reached its assigned cruising altitude of 35,000 feet at about 9:02 am (B). The flight appears normal until a brief descent of about 600 feet starting at 9:28 (C). The words "get out of here" and sounds of a struggle were recorded on the air traffic control radio at FAA's Cleveland Center facility at this time. The Cockpit Voice Recorder (CVR) onboard the airplane began providing sounds from the cockpit at approximately 9:32. At 9:34 (D) the airplane starts to climb from 35,000 feet, and shortly thereafter begins a left turn to a Southeast heading of 120 with the autopilot in heading select mode. The airplane maintained a maximum altitude of 41,000 feet for about 2 minutes and then started descending at about 9:39 (E), with the autopilot in vertical speed mode and at a descent rate of 4,000 feet/minute. Radar stations stopped receiving transponder returns from UAL93 at approximately 9:41. There was a brief interruption in the descent at 9:46 (F) as the airplane climbed from 19,000 feet to 20,500 feet before resuming its descent, but at a slower rate (1,300 feet/minute). At about 9:57 the airplane started a left turn to the east. At 9:59 (G) the airplane was at 5,000 feet when about 2 minutes of rapid, full left and right control wheel inputs resulted in multiple 30 degree rolls to the left and right. From approximately 10:00 to 10:02 there were four distinct control column inputs that caused the airplane to pitch nose-up (climb) and nose-down (dive) aggressively. During this time the airplane climbed to about 10,000 feet while turning to the right. The airplane then pitched nose-down and rolled to the right in response to flight control inputs, and impacted the ground at about 490 knots (563 mph) in a 40 degree nose-down, inverted attitude. The time of impact was 10:03:11. Ritter Chief, Vehicle Performance Division NTSB

3 T Figure 1. UA-93 Radar Ground Track O o O 01 S'o A - UAL 93 takes off from Newark, NJ at 0842 EOT. B - UAL 93 levels off at assigned altitude of 35,000 ft. C foot deviation from assigned altitude (assumed takeover point.) D - Starts climb to 41,000 feet, then turns towards Southeast. E -At max altitude of 41,000 feet; xponder returns cease 2 m in. later. F - Brief interruption in descent. G - Rapid control wheel inputs; aircraft starts climbing. H -Aircraft noses down and starts rapid descent. I - Aircraft aircraft impacts the ground inverted and at high speed. Q LJ 010:03:11 AM I

4 45000 Figure 2. UA-93 Altitude Profile _ Q> A - UAL 93 takes off from Newark, NJ at 0842 EOT. B - UAL 93 levels off at assigned altitude of 35,000 ft. C foot deviation from assigned altitude (assumed takeover point.) D -Starts climb to 41,000 feet, then turns towards Southeast. E - At max altitude of 41,000 feet; xponder returns cease 2 min. later. F - Brief interruption in descent. G - Rapid control wheel inputs; aircraft starts climbing. H -Aircraft noses down and starts rapid descent. I - Aircraft aircraft Impacts the ground inverted and at high speed. 08:30:00 08:40:00 08:50:00 09:00:00 09:10:00 09:20:00 09:30:00 09:40:00 09:50:00 10:00:00 10: Eastern Daylight Time, HH:MM:SS (= UTC - 4 Hours) 4

5 8:41:49 LC United ninety three wind three three zero at seven runway four left cleared for takeoff. [EWR LC] 8:41:53 cleared takeoff four left United ninety three. [EWR LC] 8:42:07 LC United ninety three. [EWR LC] 8:42:41 LC United ninety three contact departure. [EWR LC] 8:42:43 going to departure United ninety three good day. [EWR LC] 8:43:00 United ninety three fourteen hundred for twenty five hundred. [N Newark Dept.] 8:43:04 E155 United ninety three New York departure good morning radar contact climb and maintain eight thousand and turn left heading three three zero vector for ELIOT. [N Newark Dept.] 8:43:12 eight thousand heading three three zero for ELIOT United ninety three. [N Newark Dept.] 8:43:48 E155 United ninety three turn left heading uh two eight zero. [N Newark Dept.] 8:43:52 left two eighty United ninety three. [N Newark Dept.] 8:44:34 E155 United ninety three climb and maintain one zero thousand. [N Newark Dept.] 8:44:38 climb and maintain one zero thousand ten thousand United ninety three. [N Newark Dept.] 8:45:10 E155 United ninety three do not exceed two five zero knots. [N Newark Dept.] 8:45:13 not exceed two fifty United ninety three. [N Newark Dept.] 8:45:54 E155 United ninety three resume normal speed contact departure one three five point three five. [N Newark Dept.] 8:46:00 one three five three five normal speed good day United ninety three. [N Newark Dept.] 8:46:18 United ninety three is with you one zero thousand, normal speed, heading two eighty. [N Liberty West] 8:46:23 B43 United ninety three departure good morning, climb maintain one four thousand. [N Liberty West] 8:46:26 climb maintain one four thousand United ninety three. [N Liberty West] 8:48:03 B43 United ninety three right turn heading of ah three one zero. [N Liberty West] 8:48:07 right heading three one zero United ninety three. [N Liberty West] 8:48:41 B43 United ninety three climb maintain one six thousand. [N Liberty West] 8:48:44 climb maintain one six thousand United ninety three. [N Liberty West] 8:49:31 B43 United ninety three climb maintain one seven thousand go direct ELIOT on course. [N Liberty West] 8:49:35 up to one seven thousand direct ELIOT United ninety three. [N Liberty West] 8:50.37 B43 United ninety three contact New York center one three two point one good day. [N Liberty West] 8:50:41 thirty two one good day United ninety three. [N Liberty West] 8:50:57 and New York United ninety three with you one seven thousand. [ZNY R39] 8:51:03 R39 United ninety three New York center climb and maintain flight level two eight zero. [ZNY R39] 8:51:07 maintain two eight oh United ninety three. [ZNY R39] 8:54:09 R39 United ninety three cleared direct DEMO. [ZNY R39] 8:54:12 direct DEMO United ninety three. [ZNY R39]

6 8:54:53 R39 8:54:59 8:55:05 8:55:09 R73 8:57:12 R73 8:57:16 9:22:20 9:22:26 RA73 9:22:37 9:23:00 ACARS 9:23:05 9:23:14 FKL-R 9:23:56 FKL-R 9:24:00 9:24:20 9:25:06 9:25:08 9:27:25 9:27:30 9:28:16 9:28:48 9:29:14 9:29:20 9:29:34 9:29:40 9:29:56 9:30:03 9:30:58 9:31:55 9:32:05 9:35:36 United ninety three contact New York center one three three point four correction New York center one thirty two eighty seven. [ZNY R39] one thirty two eighty seven good day United uh ninety three. [ZNY R39] good morning New York United ninety three with you twenty five and a half for two eight oh. [ZNY R73] United ninety three New York center good morning. [ZNY R73] United ninety three climb and maintain flight level three five zero. [ZNY R73] leaving two eight for three five oh United ninety three. [ZNY R73] United ninety three starting to pick up some light chop at thirty five, any ride reports? [ZNY RA73] the ah first complained I've had and United ah ninety three, contact the Cleveland center now on one three three point zero seven. [ZNY RA73] thrity three oh seven United ninety three. [ZNY RA73] BEWARE ANY COCKPIT INTROUSION.. TWO AIRCRAFT IN NY, HIT TRADE CNTER BUILDS morning Cleveland it's United ninety three with you at three five oh ah there's some light chop here at thirty five any ride reports? [ZOB 13:01-13:31 Franklin-R] an no just a little light chop nothing worse than that United ninety three. [ZOB 13:01-13:31 Franklin-R] United ninety three Cleveland one three three three seven. [ZOB Franklin-R] one three three three seven good day United ninety three. [ZOB Franklin-R] good morning Cleveland United ninety three is with you at three five oh intermittent light chop. [ZOB Lorain-R] United ninety three checking in three five oh. [ZOB Lorain-R] United ninety three three five zero roger. [ZOB Lorain-R] United ninety three that traffic for you is one o'clock twelve miles east bound three seven zero. [ZOB Lorain-R] negative contact we're looking United ninety three. [ZOB Lorain-R] *** (mayday) *** (hey get out of here) ***. [ZOB Lorain-R] *** (get out of here) *** (get out of here). [ZOB Lorain-R] United ninety three verify three five zero. [ZOB Lorain-R] United ninety three verify you're at flight level ah three five zero. [ZOB Lorain-R] United ninety three verify you're level at three five zero. [ZOB Lorain-R] United ninety three Cleveland. [ZOB Lorain-R] United ninety three Cleveland. [ZOB Lorain-R] United ninety three if you hear Cleveland center ident please. [ZOB Lorain-R] United ninety three Cleveland if you hear the center ident. [ZOB Lorain-R] *** please sit down, keep remaining seating, we have a bomb on board, so ***. [ZOB Lorain-R] er uh calling Cleveland center you're unreadable say again slowly. [ZOB Lorain-R] ah United ninety three if able * ah squawk trip please. [ZOB

7 Lorain-R] 9:36:51 [Cleveland center announces that UAL93 is turning south and east and climbing]. [ZOB Lorain-R] 9:39:10 ah this is the captain uh would like to all remain seated there is a bomb aboard and we go back to the airport and to have our demands so please remain quiet. [ZOB Lorain-R] 9:39:19 okay thats United ninety three calling? [ZOB Lorain-R] 9:39:24 United ninety three understand you have a bomb on board go ahead. [ZOB Lorain-R] 9:40:04 United ninety three go ahead. [ZOB Lorain-R] _ 9:40:12 United ninety three go ahead. [ZOB Lorain-R] > 9:41:01 United ninety three do you hear Cleveland center? [ZOB Lorain- 9:41:36 R] [Cleveland center announces loss of transponder signal from UAL93] [ZOB Lorain-R] 9:45:29 United ninety three Cleveland do you still hear the center? [ZOB Lorain-R] 9:45:35 United ninety three do you still hear Cleveland? [ZOB Lorain-R] 9:46:13 United ninety three United ninerthree do you hear Cleveland? [ZOB Lorain-R] 9:47:28 United ninety three United ninety three Cleveland. [ZOB Lorain- R] 9:48:39 United ninety three United ninety three do you hear Cleveland center. [ZOB Lorain-R]

8 NATIONAL TRANSPORTATION SAFETY BOARD Vehicle Recorders Division Washington, D.C December 21, 2001 Air Traffic Control Recording Specialist's Report by Joseph A. Gregor A. ACCIDENT Location: Date: Time:1 Aircraft: NTSB Number: Shanksville, PA September 11, 2001 Boeing 757 DCA01SA065 B. GROUP N/A C. SUMMARY On September 11, 2001 United Airlines Flight 93, a Boeing 757 crashed near Shanksville, PA. A certified analog copy of air traffic control (ATC) transmissions recorded on September 11, 2001 at various tower, departure, and Air Route Traffic Control Center (ARTCC) positions along the route of flight was sent to the audio laboratory of the National Transportation Safety Board. These recordings were used to create an audio and text transcript of the aircratt-ground communications from takeoff to accident time.

9 - II - D. DETAILS OF INVESTIGATION Transmissions between the accident aircraft and ATC were recorded and an analog copy was sent to the Safety Board's audio laboratory. The tapes cover the following ATC positions and time periods: Facility EWR N90 N90 ZNY ZNY ZOB ZOB ZOB ZOB Time Period1 (UTC) Position LC E155 B43 Sector 39R Sector 73R FKL-R Sections of the tape recordings containing air-ground transmissions to and from the incident aircraft were digitized at a 22,050 Samples/second data rate and saved as standard Microsoft.wav files, individual.wav files were combined into a single 1 hour 3 minute 19 second long.wav file containing all transmissions to and from the incident aircraft from 1241:49 UTC (aircraft cleared for takeoff) to 1348:47 UTC. A transcript was obtained from the final composite recording. Times are approximate due to limitations inherent in the data obtained from the FAA. Joseph A. Gregor Electrical Engineer

10 - Ill - Transcript of ATC communications with a Boeing B-757 (United Airlines flight 93) which crashed near Shanksville, PA on September 11, LEGEND Radio transmission from United B-757, flight 93 LC E155 B43 39R 73R FKL-R Radio transmission from Local Control Radio transmission from Newark Departure Radio transmission from Liberty West Radio transmission from Sector 39 Radar position Radio transmission from Sector 73 Radar position Radio transmission from Franklin Radar position Radio transmission from Lorain Radar position * Unintelligible word # Expletive ( ) Questionable insertion [ ] Editorial insertion Pause - Interruption Note 1: Times are expressed in universal coordinated time (UTC). Note 2: Only radio transmissions to and from the accident aircraft were transcribed. Note 3: Words shown with excess vowels, letters, or drawn out syllables are a phonetic representation of the words as spoken.

11 INTRA-COCKPIT COMMUNICATION AIRCRAFT-TO-GROUND COMMUNICATION Page 1 of 10 Start of recording Start of transcript 1241:49* LC United ninety three wind three three zero at seven runway four left cleared for takeoff. [EWR LC] 1241:53* cleared takeoff four left United ninety three. [EWR LC] 1242:07* LC United ninety three. [EWR LC] 1242:41* LC United ninety three contact departure. [EWR LC] 1242:43* going to departure United ninety three good day. [EWR LC] 1243:00 United ninety three fourteen hundred for twenty five hundred. [N Newark Dept.]

12 INTRA-COCKPIT COMMUNICATION AIRCRAFT-TO-GROUND COMMUNICATION Page 2 of :04 E155 United ninety three New York departure good morning radar contact climb and maintain eight thousand and turn left heading three three zero vector for ELIOT. [N Newark Dept.] 1243:12 eight thousand heading three three zero for ELIOT United ninety three. [N Newark Dept.] 1243:48 E155 United ninety three turn left heading uh two eight zero. [N Newark Dept.] 1243:52 left two eighty United ninety three. [N Newark Dept.] 1244:34 E155 United ninety three dimb and maintain one zero thousand. [N Newark Dept.] 1244:38 climb and maintain one zero thousand ten thousand United ninety three. [N Newark Dept.] 1245:10 E155 United ninety three do not exceed two five zero knots. [N Newark Dept.] 1245:13 not exceed two fifty United ninety three. [N Newark Dept.]

13 INTRA-COCKPIT COMMUNICATION AIRCRAFT-TO-GROUND COMMUNICATION Page 3 of :54 E155 United ninety three resume normal speed contact departure one three five point three five. [N Newark Dept.] 1246:00 one three five three five normal speed good day United ninety three. [N Newark Dept.] 1246:18* United ninety three is with you one zero thousand, normal speed, heading two eighty. [N Liberty West] 1246:23* B43 United ninety three departure good morning, climb maintain one four thousand. [N Liberty West] 1246:26* climb maintain one four thousand United ninety three. [N Liberty West] 1248:03* B43 United ninety three right turn heading of ah three one zero. [N Liberty West] 1248:07* right heading three one zero United ninety three. [N Liberty West] 1248:41* B43 United ninety three climb maintain one six thousand. [N Liberty West]

14 INTRA-COCKPIT COMMUNICATION AIRCRAFT-TO-GROUND COMMUNICATION Page 4 of :44* 1249:31* B :35* 1250:37* B :41* 1250:57* 1251:03 R : :09* R39 climb maintain one six thousand United ninety three. [N Liberty West] United ninety three climb maintain one seven thousand go direct ELIOT on course. [N Liberty West] up to one seven thousand direct ELIOT United ninety three. [N Liberty West] United ninety three contact New York center one three two point one good day. [N Liberty West] thirty two one good day United ninety three. [N Liberty West] and New York United ninety three with you one seven thousand. [ZNY R39] United ninety three New York center climb and maintain flight level two eight zero. [ZNY R39] maintain two eight oh United ninety three. {ZNY R39] United ninety three cleared direct DEMO. [ZNY R39]

15 INTRA-COCKPIT COMMUNICATION AIRCRAFT-TO-GROUND COMMUNICATION Page 5 of :12 direct DEMO United ninety three. [ZNY R39] 1254:53 R39 United ninety three contact New York center one three three point four correction New York center one thirty two eighty seven. [ZNY R39] 1254:59* one thirty two eighty seven good day United uh ninety three. [ZNY R39] 1255:05* good morning New York United ninety three with you twenty five and a half for two eight oh. [ZNY R73] 1255:09* R73 United ninety three New York center good morning. [ZNY R73] 1257:12* R73 United ninety three climb and maintain flight level three five zero. [ZNY R73] 1257:16* leaving two eight for three five oh United ninety three. [ZNY R73] 1322:20 United ninety three starting to pick up some light chop at thirty five, any ride reports? [ZNY RA73]

16 INTRA-COCKPIT COMMUNICATION AIRCRAFT-TO-GROUND COMMUNICATION Page 6 of :26 RA73 the ah first complained I've had and United ah ninety three, contact the Cleveland center now on one three three point zero seven. [ZNY RA73] 1322:37 thrity three oh seven United ninety three. [ZNY RA73] 1323:00 ACARS BEWARE ANY COCKPIT INTROUSION.. TWO AIRCRAFT IN NY, HIT TRADE CNTER BUILDS 1323:05 morning Cleveland it's United ninety three with you at three five oh ah there's some light chop here at thirty five any ride reports? [ZOB Franklin-R] 1323:14 FKL-R an no just a little light chop nothing worse than that United ninety three. [ZOB Franklin-R] 1323:56 FKL-R United ninety three Cleveland one three three three seven. [ZOB Franklin-R] 1324:00 one three three three seven good day United ninety three. [ZOB Franklin-R] 1324:20* good morning Cleveland United ninety three is with you at three five oh intermittent light chop. [ZOB Lorain-R]

17 INTRA-COCKPIT COMMUNICATION AIRCRAFT-TO-GROUND COMMUNICATION Page 7 of :06* 1325:08* 1327:25* 1327:30* 1328:16* 1328:48* 1329:14* 1329:20* 1329:34* United ninety three checking in three five oh. [ZOB Lorain-R] United ninety three three five zero roger. [ZOB Lorain-R] United ninety three that traffic for you is one o'clock twelve miles east bound three seven zero. [ZOB Lorain-R] negative contact we're looking United ninety three. [ZOB Lorain-R] *** (mayday) *** (hey get out of here) ***. [ZOB Lorain-R] *** (get out of here) (get out of here). [ZOB Lorain-R] United ninety three verify three five zero. [ZOB Lorain-R] United ninety three verify you're at flight level ah three five zero. [ZOB Lorain-R] United ninety three verify you're level at three five zero. [ZOB Lorain-R]

18 INTRA-COCKPIT COMMUNICATION AIRCRAFT-TO-GROUND COMMUNICATION Page 8 of :40* United ninety three Cleveland. [ZOB Lorain- R] 1329:56 United ninety three Cleveland. [ZOB Lorain- R] 1330:03* United ninety three if you hear Cleveland center ident please. [ZOB Lorain-R] 1330:58* United ninety three Cleveland if you hear the center ident. [ZOB Lorain-R] 1331:55* *** please sit down, keep remaining seating, we have a bomb on board, so ***. [ZOB Lorain-R) 1332:05* er uh calling Cleveland center you're unreadable say again slowly. [ZOB Lorain-R] 1335:36 ah United ninety three if able * ah squawk trip please. [ZOB Lorain-R] 1336:51 [Cleveland center announces that UAL93 is turning south and east and climbing]. [ZOB Lorain- R]

19 INTRA-COCKPIT COMMUNICATION AIRCRAFT-TO-GROUND COMMUNICATION Page 9 of : : : : : : : :29* ah this is the captain uh would like to all remain seated there is a bomb aboard and we go back to the airport and to have our demands so please remain quiet. [ZOB Lorain-R] okay thats United ninety three calling? [ZOB Lorain-R] United ninety three understand you have a bomb on board go ahead. [ZOB Lorain-R] United ninety three go ahead. [ZOB Lorain- R] United ninety three go ahead. [ZOB Lorain- R] United ninety three do you hear Cleveland center? [ZOB Lorain-R] [Cleveland center announces loss of transponder signal from UAL93] [ZOB Lorain-R] United ninety three Cleveland do you still hear the center? [ZOB Lorain-R]

20 INTRA-COCKPIT COMMUNICATION AIRCRAFT-TO-GROUND COMMUNICATION Page 10 of :35* United ninety three do you still hear Cleveland? [ZOB Lorain-R] 1346:13* United ninety three United niner three do you hear Cleveland? [ZOB Lorain-R] 1347:28* United ninety three United ninety three Cleveland. [ZOB Lorain-R] 1348:43 United ninety three United ninety three do you hear Cleveland center. [ZOB Lorain-R] End of transcript 'times verified via FAA timecode reader.

21 1241: : : : : : : : : : : : : : : : : : : : : : : : : : : : :03 LC LC LC E155 UAL- 9 3 E155 UAL- 9 3 E155 UAL- 9 3 E155 UAL- 9 3 E155 UAL- 9 3 UAL- 9 3 B43 UAL- 9 3 B43 UAL- 9 3 B43 UAL- 9 3 B43 UAL- 9 3 B43 UAL- 9 3 UAL- 9 3 R39 United ninety three wind three three zero at seven runway four left cleared for takeoff. [EWR LC] cleared takeoff four left United ninety three. [EWR LC] United ninety three. [EWR LC] United ninety three contact departure. [EWR LC] going to departure United ninety three good day. [EWR LC] United ninety three fourteen hundred for twenty five hundred. [N Newark Dept.] United ninety three New York departure good morning radar contact climb and maintain eight thousand and turn left heading three three zero vector for ELIOT. [N Newark Dept.] eight thousand heading three three zero for ELIOT United ninety three. [N Newark Dept.] United ninety three turn left heading uh two eight zero. [N Newark Dept.] left two eighty United ninety three. [N Newark Dept.] United ninety three climb and maintain one zero thousand. [N Newark Dept.] climb and maintain one zero thousand ten thousand United ninety three. [N Newark Dept.] United ninety three do not exceed two five zero knots. [N Newark Dept.] not exceed two fifty United ninety three. [N Newark Dept.] United ninety three resume normal speed contact departure one three five point three five. [N Newark Dept.] one three five three five normal speed good day United ninety three. [N Newark Dept.] United ninety three is with you one zero thousand, normal speed, heading two eighty. [N Liberty West] United ninety three departure good morning, climb maintain one four thousand. [N Liberty West] climb maintain one four thousand United ninety three. [N Liberty West] United ninety three right turn heading of ah three one zero. [N Liberty West] right heading three one zero United ninety three. [N Liberty West] United ninety three climb maintain one six thousand. [N Liberty West] climb maintain one six thousand United ninety three. [N Liberty West] United ninety three climb maintain one seven thousand go direct ELIOT on course. [N Liberty West] up to one seven thousand direct ELIOT United ninety three. [N r1256 Liberty West] United ninety three contact New York center one three two point one good day. [N Liberty West] thirty two one good day United ninety three. [N Liberty West] and New York United ninety three with you one seven thousand. [ZNY R39] United ninety three New York center climb and maintain flight level two eight zero. [ZNY R39]

22 1251: :09 R : :53 R :59* 1255: :09 R :12 R : : :26 RA : :00 ACARS 1323: : : : : : : : : : : : : : : :56 FKL-R FKL-R maintain two eight oh United ninety three. [ZNY R39] United ninety three cleared direct DEMO. [ZNY R39] direct DEMO United ninety three. [ZNY R39] United ninety three contact New York center one three three point four correction New York center one thirty two eighty seven. [ZNY R39] one thirty two eighty seven good day United uh ninety three. [ZNY R39] good morning New York United ninety three with you twenty five and a half for two eight oh. [ZNY R73] United ninety three New York center good morning. [ZNY R73] United ninety three climb and maintain flight level three five zero. [ZNY R73] leaving two eight for three five oh United ninety three. [ZNY R73] United ninety three starting to pick up some light chop at thirty five, any ride reports? [ZNY RA73] the ah first complained I've had and United ah ninety three, contact the Cleveland center now on one three three point zero seven. [ZNY RA73] thrity three oh seven United ninety three. [ZNY RA73] BEWARE ANY COCKPIT INTROUSION.. TWO AIRCRAFT IN NY, HIT TRADE CNTER BUILDS morning Cleveland it's United ninety three with you at three five oh ah there's some light chop here at thirty five any ride reports? [ZOB Franklin-R] an no just a little light chop nothing worse than that United ninety three. [ZOB Franklin-R] United ninety three Cleveland one three three three seven. [ZOB Franklin-R] one three three three seven good day United ninety three. [ZOB Franklin-R] good morning Cleveland United ninety three is with you at three five oh intermittent light chop. [ZOB Lorain-R] United ninety three checking in three five oh. [ZOB Lorain-R] United ninety three three five zero roger. [ZOB Lorain-R] United ninety three that traffic for you is one o'clock twelve miles east bound three seven zero. [ZOB Lorain-R] negative contact we're looking United ninety three. [ZOB Lorain-R] *** (mayday) *** (hey get out of here) *** [ZOB Lorain-R] *** (get out of here) *** (get out of here). [ZOB Lorain-R] United ninety three verify three five zero. [ZOB Lorain-R] United ninety three verify you're at flight level ah three five zero. [ZOB Lorain-R] United ninety three verify you're level at three five zero. [ZOB Lorain-R] United ninety three Cleveland. [ZOB Lorain-R] United ninety three Cleveland. [ZOB Lorain-R]

23 1330:03 United ninety three if you hear Cleveland center ident please. [ZOB Lorain-R] 1330:58 United ninety three Cleveland if you hear the center ident. [ZOB Lorain-R] 1331:55 *** please sit down, keep remaining seating, we have a bomb on board, so ***. [ZOB Lorain-R] 1332:05 er uh calling Cleveland center you're unreadable say again slowly. [ZOB Lorain-R] 1335:36 ah United ninety three if able * ah squawk trip please. [ZOB Lorain-R] 1336:51 [Cleveland center announces that UAL93 is turning south and east and climbing]. [ZOB Lorain-R] 1339:10 ah this is the captain uh would like to all remain seated there is a bomb aboard and we go back to the airport and to have our demands so please remain quiet. [ZOB Lorain-R] 1339:19 okay thats United ninety three calling? [ZOB Lorain- R] 1339:24 United ninety three understand you have a bomb on board go ahead. [ZOB Lorain-R] 1340:01 United ninety three go ahead. [ZOB Lorain-R] 1340:12 United ninety three go ahead. [ZOB Lorain-R] 1341:01 United ninety three do you hear Cleveland center? [ZOB Lorain-R] 1341:36 [Cleveland center announces loss of transponder signal from UAL93] [ZOB Lorain-R] 1345:29 United ninety three Cleveland do you still hear the center? [ZOB Lorain-R] 1345:35 United ninety three do you still hear Cleveland? [ZOB Lorain-R] 1346:13 United ninety three United niner three do you hear Cleveland? [ZOB Lorain-R] 1347:28 United ninety three United ninety three Cleveland. [ZOB Lorain-R] 1348:43 United ninety three United ninety three do you hear Cleveland center. [ZOB Lorain-R]

24 United Airlines Flight 93 - Flight Profile OFFICIAL USE ONLY The following profile of United Airlines Flight 93 is based on data from the flight data recorder (FDR) recovered from the crash site, as well as radar data obtained from the Federal Aviation Administration's Air Route Traffic Control Centers and the U.S. Air Force 84th Radar Evaluation Squadron. Figure 1 shows the flight path of the aircraft from take off at Newark, NJ to the crash site near Johnstown, PA. Figure 2 shows the aircraft's altitude profile for the 1 hour and 21 minute duration of the flight. United flight 93 departed Newark, NJ at 8:42 am (point A in Figures 1 and 2) and reached its assigned cruising altitude of 35,000 feet at about 9:02 am (B). The flight appears normal until a brief descent of about 600 feet starting at 9:28 (C). The words "get out of here" and sounds of a struggle were recorded on the air traffic control radio at FAA's Cleveland Center facility at this time. The Cockpit Voice Recorder (CVR) onboard the airplane began providing sounds from the cockpit at approximately 9:32. At 9:34 (D) the airplane starts to climb from 35,000 feet, and shortly thereafter begins a left turn to the southeast. The airplane maintained a maximum altitude of 41,000 feet for about 2 minutes and then started descending at about 9:39 (E). Radar stations stopped receiving transponder returns fromual93 at approximately 9:41. There was a brief interruption in the descent at 9:46 (F) as the airplane climbed from 19,000 feet to 20,500 feet before resuming its descent. At about 9:57 the airplane started a left turn to the east. Just before 9:59 (G) the airplane was at 5,000 feet when about 2 minutes of rapid, full left and right control wheel inputs resulted in multiple 30 degree rolls to the left and right. From approximately 10:00 to 10:02 (H) there were four distinct control column inputs that caused the airplane to pitch nose-up (climb) and nose-down (dive) aggressively. During this time the airplane climbed to about 10,000 feet while turning to the right. The airplane then pitched nose-down and rolled to the right in response to flight control inputs, and impacted the ground at about 490 knots (563 mph) in a 40 degree nose-down, inverted attitude. The time of impact was 10:03:11.

25 Figure 1. UA-93 Radar Ground Track A - UAL 93 takes off from Newark, NJ at 0842 EDT. B - UAL 93 levels off at assigned altitude of 35,000 ft. C foot deviation from assigned altitude. D - Starts climb to 41,000 feet, then turns towards Southeast. E - At max altitude of 41,000 feet; xponder returns cease 2 min. later. F - Brief interruption in descent. G - Evidence of struggle on CVR; aircraft starts climbing. H - Aircraft noses down and starts rapid descent. I - Aircraft aircraft impacts the ground inverted and at high speed. Q LI 010:03:11 AM C

26 Figure 2. UA-93 Altitude Profile.L..LJ. 1 I I j-~i r! L. _!_.-, i _ t "11 0) TJ I UAL 93 takes off from Newark, NJ at 0842 EOT. - UAL 93 levels off at assigned altitude of 35,000 ft foot deviation from assigned altitude. - Starts climb to 41,000 feet, then turns towards Southeast. - At max altitude of 41,000 feet; xponder returns cease 2 min. later. - Brief interruption in descent. - Evidence of struggle on CVR; aircraft starts climbing. - Aircraft noses down and starts rapid descent. Aircraft aircraft impacts the ground inverted and at high speed. _ Jl_4..._...L. I I I :30:00 08:40: 08:50:00 09:00:00 09:10:00 09:20:00 09:30:00 09:40:00 09:50: Eastern Daylight Time, HH/ SS (= UTC - 4 Hours) 10:00:00 10:10:00