WARNING : USE SOLVENTS/CLEANING AGENTS, SEALANTS AND OTHER SPECIAL
_______ MATERIALS ONLY WITH A GOOD SUPPLY OF AIR. OBEY THE MANUFACTURERS INSTRUCTIONS. PUT ON PROTECTIVE CLOTHING. DO NOT GET THEM IN YOUR MOUTH. DO NOT SMOKE. DO NOT BREATHE THE GAS. THESE MATERIALS ARE POISONOUS, FLAMMABLE AND SKIN IRRITANT. GET MEDICAL HELP IF YOUR SKIN OR EYES BECOME IRRITATED.
Subtask 51-76-12-914-052
B. Do the Repair
(1) Apply SEALANTS (Material No. 09-009) to the leak area. Push the sealant into the leak source with a flat nonmetallic tool until the leak stops.
NOTE : If you cannot get a good seal, defuel the aircraft to below
____ the leak level (Ref. TASK 28-25-00-650-001).
(2)
Apply a second coat of SEALANTS (Material No. 09-009).
(3)
Let the repair cure.
(4)
Refuel the aircraft above the level of the repair (Ref. TASK 12-11-28-650-004) and examine for leaks.
NOTE : Leaks are not permitted.
____
________
5. Close-up
Subtask 51-76-12-942-052
A. Remove the ground support and maintenance equipment, the special and standard tools and all other items.
STANDARD COMPOSITE REPAIRS - DESCRIPTION AND OPERATION
______________________________________________________
1. General_______
This topic gives information on minor and temporary repairs to composite material components. The information is of a general type only. You must refer to specific repair data, material specifications and manufacturer's instructions. Failure to do so could result in an unauthorised repair.
The composite materials used are Glassfiber Reinforced Plastic (GFRP), Carbonfiber Reinforced Plastic (CFRP) and Aramidfiber Reinforced Plastic (AFRP). These materials are used in the construction of composite structures.
When you do a repair to composite structures, the repair materials are:
-carbonfiber materials to repair carbonfiber structure.
-glassfiber materials to repair glassfiber and aromidfiber structures.
2. Description___________
A. Types of Structure
(1)
Sandwich Structures Composite material is used for the skin of structures which is then bonded to a metallic or nonmetallic core. The core is usually a honeycomb structure (Ref. AMM 51-77-12 08).
(2)
Monolithic Structures These structures have a composite material skin with internal stringers, ribs and spars to give rigidity and strength (Ref. AMM 51-77-14 08).
(3)
Mixed Structures To follow the aircraft design, some structures are mixed; part sandwich and part monolithic structure.
NOTE : For more data Ref. ASRM 51-77-00 or the ASRM chapter related
____
to the component you will repair.
MATERIAL HANDLING AND PREPARATION - MAINTENANCE PRACTICES
_________________________________________________________
TASK 51-77-11-910-006
Preparation of Composite Material Surfaces for Repair (Damage of not more than 1 Layer)
WARNING : USE SOLVENTS/CLEANING AGENTS, SEALANTS AND OTHER SPECIAL MATERIALS
_______ ONLY WITH A GOOD SUPPLY OF AIR. OBEY THE MANUFACTURERS INSTRUCTIONS. PUT ON PROTECTIVE CLOTHING. DO NOT GET THEM IN YOUR MOUTH. DO NOT SMOKE. DO NOT BREATHE THE GAS. THESE MATERIALS ARE POISONOUS, FLAMMABLE AND SKIN IRRITANT. GET MEDICAL HELP IF YOUR SKIN OR EYES BECOME IRRITATED.
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific demineralized water No specific emery paper grade 100 No specific emery paper grade 280 No specific emery paper grade 400 No specific light grit blast (400-700) micron walnut grit No specific lint-free cloth No specific masking paper No specific masking tape No specific vacuum cleaner
B. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 11-004 USA MIL-T-81533 1.1.1TRICHLOROETHANE (METHYL CHLOROFORM) (Ref. 20-31-00)
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