Innovation in Technology for Aircraft Maintenance Composite & Metallic Structures Equipment, Solution Engineering, Research, Training SHAPED BLANKETS for RADOME REPAIR Application to AIRBUS, ATR, BOEING,. Figure 1: Shaped blankets for radome part repair PRESENTATION GMIAERO offers ready to use moulded blankets to the shape of aircraft radomes. Our catalogue includes most frequently requested models. These blankets have been designed to cover the tip of Radomes of Boeing 777, 767, 747, 737,..., and AIRBUS Wide and Narrow Bodies,... We offer a STANDARD LIST of products in terms of dimensions and electrical zoning. These blankets are shaped to fit either the External skin or the Internal skin of the radome. We also answer to specific questions in terms of design principles and dimensions. GMI AERO has been manufacturing radome blankets since more than twenty years with continuous follow up of manufacturer specifications and evolution of technology and materials in agreement with CMM instructions. GMI AERO offers also training courses for customers who want to master implementation techniques and state of the art rules of repair. 9 Rue Buffault 75009 Paris France Tél.: + 33 1 4 8 11 44 Fax: + 33 1 4 8 98 38 Email: gmi.aero@wanadoo.fr - Web site : http: //www.gmi-aero.com
DESIGN PRINCIPLES The blankets are built according to certain design principles as stated below. The user must understand that the criteria that funded the design are adapted to sound repair techniques for radomes. DIMENSIONS OF THE BLANKETS The dimensions of our blankets have been decided by consideration of the three following aspects: 1. The blankets cover the tip of the radome and in particular the transparency area. This area is non developable and repairs will require this type of shaped blankets. Out of this area, local repairs could be implemented by using flat circular blankets (consult our catalogue for selection).. When repairs cover a larger surface than the transparency area, it is mostly recommended to proceed in another way, like refitting a complete cap to the radome base. The bonding of the belt of the new cap can be done either with specific blankets or in an oven. 3. Blankets dimensions present large heating areas. However electrical zoning allow to heat the areas to be repaired only and thus prevent the risk of overheating other areas. ELECTRICAL ZONING Due to the large heating area of each blanket, it is logical to split the surface into independent heating areas. The user has thus the possibility to activate for heating only the zones covering the repair. A unique zone blanket would heat non damaged areas with risk of delamination. ZONE STYLE / SECTORS OR CONCENTRIC ZONING Two styles of electrical zoning design are offered: by sector or by concentric zones. These two styles differ according to preferences of customers. MRO would prefer the concentric style while airlines would go generally for the sector style. Some radome blankets are offered only under sector zoning. The figures below illustrate the notion of concentric and sector design. Figure 1: Thermocouple installation - Note the width of the working area in the clean room.
Figure : Example of design for a Concentric electrical zone distribution Figure 3: Example of a design of blanket in 4 electrical sector design 3
INTERNAL / EXTERNAL SKI N SHAPES Due to the difference of profiles between the two skins, two blankets must be considered: Internal Skin Shaped, External Skin Shaped. The external one must be used to reconstitute first the external skin and for the curing of the adhesive to bond the honeycomb. The internal skin blanket is used to bond the internal skin. According to CMM the repair must be conducted from «inside and thus teh internal skin blankets are recommended. MOULDS AND USE Thin and flexible prepreg moulds must be manufactured with advantages for the use of the blankets when repairing external skins specially. The mould must be inserted between the blanket and the skin of the radome. In that respect, they must be manufactured with glass or carbon mould prepreg. The thickness being of to 3 mm max.it will be used to guarantee the profile of the radome. Also the mould is necessary to support the thermocouples for temperature control. The sensors must be positioned on the mould, between the mould and the blanket. LENGTH DEFINITION The way the length is defined in our specification tables is explained by the following figure. Length is the one of a line starting from the base to the other base in passing by the tip. Total length L Figure 4: Definition of Length L of a tip blanket TEMPERATURE CONTROL BY ANITA BONDING CONSOLES The GMI Anita Bonding Consoles are recommended to be used for the control of the temperature of the process. The independent control of each zone as implemented by ANITA (NG, OT or EZ models) will perform appropriate control of each electrical zone of the blankets. Note one Bonding Anita will be able to control zones simultaneously. 4
MODELS OFFERED GMI can offer a wide range of moulded blankets shaped to radomes of Boeing, Airbus, Bombardier CRJ, ATR. Consult us FOR AIRBUS 001 Radome Blankets for Airbus Wide Body, Narrow Body FOR BOEING Internal and external skins SEE BELOW SOME MODELS 00 Radome Blankets for Boeing 737, 747,757,777 FOR ATR FOR BOMBARDIER Radome Blankets for ATR 003 Radome Blankets for Bombardier Regional FOR AIRBUS - MODELS IN SECTORS These models are in 4 Sectors as sketched below Their overall developed length is of 1700 mm For A30 Family Narrow Body 004 GMIHBR30-E4S-170- For External skin A30 in 4 Sectors; overall length 5
005 GMIHBR30-I4S-170- For Internal skin A30 in 4 Sectors; overall length For A340 Family Wide Body 006 GMIHBR340-E4S-170- For External skin A340 in 4 Sectors; overall length 007 GMIHBR340-I4S-170- For Internal skin A340 in 4 Sectors; overall length FOR AIRBUS - MODELS IN 3 CONCENTRIC ZONES These models are in 3 Concentric Zones as sketched below.their overall developed length is of For A30 Family Narrow Body 008 GMIHBR30-E3C-170- For External skin A30 in 3 Concentric Zones; overall length 009 GMIHBR30-I3C-170- For Internal skin A30 In 3 Concentric Zones; overall length For A340 Family Wide Body 0010 GMIHBR340-E3C-170- For External skin A340 in 3 Concentric Zones; overall length 6
0011 GMIHBR340-I3C-170- For Internal skin A340 In 3 Concentric Zones; overall length TIP COVERAGE FOR AIRBUS A30 & A340 & A380 001 GMIHBR30-I1Z-650- For Airbus A30 1 zone covering the tip on a developed length of 65 cm, for Internal skin 0013 GMIHBR30-I1Z-650- For Airbus A30 1 zone covering the tip on a developed length of 65 cm, for External skin 0014 GMIHBR340-I1Z-650- For Airbus A340 1 zone covering the tip on a developed length of 65 cm Internal skin 0015 GMIHBR340-E1Z-650- For Airbus A340 1 zone covering the tip on a developed length of 65 cm External skin AIRBUS A380 0016 GMIHBR380-E1Z-800- For Airbus A380 1 zone covering the tip on a developed length of 80 cm External skin 0017 GMIHBR380-I1Z-800- For Airbus A380 1 zone covering the tip on a developed length of 80 cm Internal skin FOR BOEING 0018 GMIHBR747-I3C-15- For Boeing 747 - Developed length 150 mm - in 3 electrical concentric zones 0 Volts 0019 GMIHBR747-E3C-15- For Boeing 747 - External Skin - Developed length:150 mm - in 3 electrical concentric zones 0 Volts 7
000 GMIHBR737-I-4S-110- For Boeing 737 - Developed length 1100 mm 001 GMIHBR737-E-4S-110- For Boeing 737 - External Skin - Developed length 1100 mm 00 GMIHBR777-E-4S-90- For Boeing 777 - Developed length 900 mm RADOME BLANKETS FOR ATR 4 OR ATR 7 Note: the radome blanket is proposed in 3 concentric zones or 4 sectors. See dimensions below in cm. Each design is offered for installation on internal skin or external skin Model in Concentric zones Model in sectors Models in Concentric zones 003 GMIHBR7--I3C-10- For ATR 4/7 - Developed length 100 mm - in 3 electrical concentric zones 0 Volts 004 GMIHBR7-E3C-10- For ATR 4/7 - External Skin - Developed length 100 mm - in 3 electrical concentric zones 0 Volts Models in Sectors 8
Model in Concentric zones Model in sectors Models in Concentric zones 005 GMIHBR7-I4S-10- For ATR 4/7 - Developed length 100 mm 006 GMIHBR7-E4S-10- For ATR 4/7 - External Skin - Developed length 100 mm Other models : please consult us. NOTE : ALL BLANKETS UNDER 0/30 VOLTS SPECIFICATIONS Dimensions according to models - see tables above cables: lead length 70 cm connectors for connection to ANITA cables Voltage: 0/30 Volts AC ( for 10 volts consult us ) Heating Circuits: in sectors or concentric zones according to models; see tables above. 9