Pipe Assemblies - Component Location Figure 602/TASK 21-52-00-991-006
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4. Procedure
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R (Ref. Fig. 602/TASK 21-52-00-991-006) R
Subtask 21-52-00-220-051
A. Detailed Visual Inspection of the Pipe Assembly
(1)
Do a general inspection of the pipe assembly for:
-distortion,
-dents,
-corrosion,
-damage to the corrosion protection treatment,
-security of attachment of the identification plates,
-scratches.
(2)
Do an inspection of the sealing surfaces and seal seats for:
-scratches,
-nicks,
-indentations,
-corrosion.
R (3) FOR 10HM11 and/or FOR 11HM11
(a)
Do an inspection of the screw threads for:
-indentations,
-breaks,
-scoring.
(b)
Do an inspection of the screw coil inserts for:
-tightness,
-correct depth.
NOTE : The screw coil insert must be 1/4 turn below the surface
____
of the hole.
(4) When you have carried out the inspection you must analize the results as follows:
(a) Small dents (of a size which will not significantly affect the cross sectional area of the pipe) are allowed if:
-they have no sharp bends and they are no deeper than 2.0 mm (0.0787 in.).
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(b)
Light scratches (with a depth no greater than 0.2 mm (0.0078 in.)) should be removed. Use a glass-fibre brush or abrasive paper to remove the scratch. After removal of the scratch the surface finish must be smooth and free from blemishes. After you rework the scratch you must then do the repair to the corrosion protection surface (refer to Para.C.).
(c)
Repair minor damage to the corrosion protection surface (refer to Para.C.).
(d)
Secure any loose identification plates.
(e)
Repair any of the other listed damage (Ref. CMM 215236), (Ref.
CMM 215238) or (Ref. CMM 215240) or replace the defective item. R
Subtask 21-52-00-230-050
B. Penetrant Inspection of the Pipe Assembly
(1) Do the penetrant inspection of the pipe assembly (Ref. NTM 518000).
(2) If you find any cracks then you must replace the defective item. Subtask 21-52-00-380-050
C. Repair to the Corrosion Protection Surface WARNING : OBEY THE MANUFACTURER'S INSTRUCTIONS WHEN YOU USE THIS/THESE
_______ MATERIAL/S. USE PROTECTIVE CLOTHING, RUBBER GLOVES, GOGGLES AND A MASK.
(1)
Preparation of the Corrosion Protection Fluid
(a) Mix the necessary amount of corrosion protection fluid PRETREATMENT FOR PAINTING (Material No. 13-002) to the manufacturers instructions.
(2)
Application of the Corrosion Protection Surface
(a)
Use a lint-free cloth which is wet with CLEANING AGENTS (Material No. 11-003) to clean the affected areas.
(b)
Let the area dry.
(c)
Put masking tape on the areas where no repair is necessary.
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(d) Use a lint-free cloth to apply the corrosion protection fluid PRETREATMENT FOR PAINTING (Material No. 13-002) to the affected areas.
NOTE : You must apply three layers of the corrosion protection
____ fluid PRETREATMENT FOR PAINTING (Material No. 13-002) within a five minute period.
(e)
Flush the affected area with clean water.
(f)
Dry the affected area with dry, clean hot air at a maximum temperature of 50 deg.C (122.00 deg.F).
(3) Quality Control
(a)
Do a visual inspection of the repair:
-the repair must have a gold to light brown colour with a matt or iridescent finish.
(b)
Do the adhesion test of the repair: NOTE : This is only a spot inspection and need not be done to the
____ entire area of the repair.
1 Apply scotch-tape No. 250 or an equivalent to powdered or
_
suspect areas of the repair.
2 Remove the tape quickly, and look to see if the protective 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM AIR CONDITIONING 空调 4(10)
