TASK 51-75-13-916-003
Repair to a layer of Cold Phosphate
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 abrasive cloth grade 400 No specific brush No specific hot air dryer No specific lintfree cloth No specific masking paper No specific masking tape
B. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 05-042 USA MIL-C-10578 TYPE II PHOSPHATIC LIQUID (Ref. 20-31-00)
Material No. 11-004 USA MIL-T-81533 1.1.1TRICHLOROETHANE (METHYL CHLOROFORM) (Ref. 20-31-00)
3. Job Set-up
__________ Subtask 51-75-13-941-052
A. Get access to the applicable area.
4. Procedure
_________ Subtask 51-75-13-120-050
A. Repair a layer of Cold Phosphate
WARNING : USE ONLY THE SPECIFIED TOOLS FOR THE PROTECTION OF THE
_______ AIRCRAFT. DO NOT APPLY ADHESIVE TAPE ON THE PROBES, DUCTS, SENSORS (STATIC, PITOT, TAT, AOA). THE SPECIFIED TOOLS :
-GIVE THE CORRECT PROTECTION TO THE AIRCRAFT EQUIPMENT,
-ARE EASY TO SEE FROM THE GROUND. MAKE AN ENTRY IN THE AIRCRAFT LOG BOOK OR ATTACH A TAG ON THE CAPTAIN SIDE STICK TO TELL THE CREW THAT PROTECTION COVERS/DEVICES ARE INSTALLED.
(1)
Cover the equipment and fittings adjacent to the area with the masking paper or masking tape.
(2)
Remove the damaged phosphate layer from an area of 20 mm (0.7874 in.) around the repair with the abrasive cloth grade 400.
WARNING : OBEY THE MANUFACTURER'S INSTRUCTIONS WHEN YOU USE THE
_______
SPECIAL MATERIAL.
THIS MATERIAL IS DANGEROUS.
(3)
Clean the area with CLEANING AGENTS (Material No. 11-004) and the lintfree cloth.
(4)
Apply a layer of SPECIAL MATERIALS (Material No. 05-042) with the brush or a clean lintfree cloth.
(5)
Let the phosphatic liquid soak into the metal surface for 5 to 15 minutes.
(6)
When the surface of the metal has changed to a grey-white color, rinse the area with clean water.
(7)
Dry the area with a the hot air dryer.
(8)
Remove the masking paper or the masking tape.
5. Close-up
________ Subtask 51-75-13-942-052
A. Remove the ground support and maintenance equipment, the special and standard tools and all other items.
SEALING REPAIRS - DESCRIPTION AND OPERATION
___________________________________________
1.
General
_______ Sealants are used on the aircraft structure to stop pressurization and fuel leaks. You must repair the sealant when it has been damaged during maintenance or found damaged on an inspection/check. For the repair of general sealants Ref. AMM 51-76-11 08. For the repair of fuel tank sealing Ref. AMM 51-76-12 08. For more data Ref. ASRM 51-24-00 and ASRM 51-76-00.
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