W DOC AIRBUS | AMM A320F

Detailed Visual Inspection of the Pipe Assemblies between the Heat Exchanger Unit, the Bypass Valve, the Anti-Ice Valve (if installed) and the Air Cycle Machine

TASK 21-52-00-200-002-A
Detailed Visual Inspection of the Pipe Assemblies between the Heat Exchanger Unit, the Bypass Valve, the Anti-Ice Valve (if installed) and the Air Cycle Machine

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ABRASIVE PAPER - 320 TO 500 GRIT
No specific
1
BRUSH - BRISTLED, FIBER, MEDIUM
No specific
1
TAPE - MASKING
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.05EHL8)
Epoxy Adhesive-Non Structural - -
(Material No.08BAA9)
Non Aqueous Cleaner-General - -
(Material No.10ABC1)
Surface Pretreatment-Light Alloys Chemical Conversion Yellow -
(Material No.14SBA1)
Textile-Lint free Cotton -
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 21-52-23-000-001-A
Removal of the Pipe Assembly between the Main Heat Exchanger and the Air Cycle Machine
TASK 21-52-23-000-002-A
Removal of the Pipe Assembly between the Anti-Ice Valve (if installed), the Bypass Valve and the Air Cycle Machine
TASK 21-52-23-000-003-A
Removal of the Pipe Assembly between the Anti-Ice Valve (if installed) and the Bypass Air Duct of the Primary Heat Exchanger
TASK 21-52-23-400-001-A
Installation of the Pipe Assembly between the Main Heat Exchanger and the Air Cycle Machine
TASK 21-52-23-400-002-A
Installation of the Pipe Assembly between the Anti-Ice Valve (if installed), the Bypass Valve and the Air Cycle Machine
TASK 21-52-23-400-003-A
Installation of the Pipe Assembly between the Anti-Ice Valve (if installed) and the Bypass Air Duct Duct of the Primary Heat Exchanger
NTM 518000
F Pipe Assemblies - Component Location ** ON A/C NOT FOR ALL
F Pipe Assemblies - Component Location ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 21-52-00-010-058-A ** ON A/C NOT FOR ALL
A. Get Access
F Pipe Assemblies - Component Location ** ON A/C NOT FOR ALL
   (1) Remove as necessary:
     (a) The pipe assembly (Ref. AMM TASK 21-52-23-000-001),
     (b) The pipe assembly (Ref. AMM TASK 21-52-23-000-002) and/or
     (c) The pipe assembly (Ref. AMM TASK 21-52-23-000-003).
Subtask 21-52-00-010-058-B ** ON A/C NOT FOR ALL
A. Get Access
F Pipe Assemblies - Component Location ** ON A/C NOT FOR ALL
   (1) Remove as necessary:
     (a) The pipe assembly (Ref. AMM TASK 21-52-23-000-001) and,
     (b) The pipe assembly (Ref. AMM TASK 21-52-23-000-002).
4. Procedure
Subtask 21-52-00-220-051-A ** ON A/C NOT FOR ALL
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
  • Correct installation of the identification plates
  • Scratches.
   (2) Do an inspection of the sealing surfaces and the seal seats of 10HM and/or 11HM for:
  • Scratches
  • Nicks
  • Indentations
  • Corrosion.
   (3) Do an inspection of the threads of the screw for:
  • Indentations
  • Breaks
  • Scoring.
   (4) Do an inspection of the screw coil inserts for:
  • Tightness
  • Correct depth.
NOTE: The screw coil insert will be 1/4 turn below the surface of the hole.
   (5) When you do the inspection, do a check of the results as follows:
     (a) Small dents that have no effect on the cross sectional area of the pipe are permitted if:
  • They have no sharp bends and the depth is not more than 2 MM (0.08 IN.).
     (b) Remove the light scratches (with a depth of not more than 2 MM (0.08 IN.)).
     (c) Use the BRUSH - BRISTLED, FIBER, MEDIUM or the ABRASIVE PAPER - 320 TO 500 GRIT and remove the scratch.
     (d) After the removal of the scratch, make sure that the surface finish is smooth and there are no blemishes.
     (e) After the removal of the scratch, repair the corrosion protection surface (refer to Para.C.).
     (f) If there is minor damage in the corrosion protection surface, repair the corrosion protection surface (refer to Para.C.).
     (g) Safety the loose identification plates.
Subtask 21-52-00-220-051-B ** ON A/C NOT FOR ALL
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
  • Correct installation of the identification plates
  • Scratches.
   (2) Do an inspection of the sealing surfaces and seal seats of 10HM and/or 11HM for:
  • Scratches
  • Nicks
  • Indentations
  • Corrosion.
   (3) Do an inspection of the threads of the screw for:
  • Indentations
  • Breaks
  • Scoring.
   (4) Do an inspection of the screw coil inserts for:
  • Tightness
  • Correct depth.
NOTE: The screw coil insert will be 1/4 turn below the surface of the hole.
   (5) When you do the inspection, do a check of the results as follows:
     (a) Small dents that have no effect on the cross sectional area of the pipe are permitted if:
  • They have no sharp bends and the depth is not more than 2 MM (0.08 IN.).
     (b) Remove the light scratches (with a depth of not more than 2 MM (0.08 IN.)).
     (c) Use the BRUSH - BRISTLED, FIBER, MEDIUM or the ABRASIVE PAPER - 320 TO 500 GRIT and remove the scratch.
     (d) After the removal of the scratch, make sure that the surface finish is smooth and there are no blemishes.
     (e) After the removal of the scratch, repair the corrosion protection surface (refer to Para.C.).
     (f) If there is minor damage in the corrosion protection surface, repair the corrosion protection surface (refer to Para.C.).
     (g) Safety the loose identification plates.
Subtask 21-52-00-230-050-A
B. Penetrant Inspection of the Pipe Assembly
   (1) Do the penetrant inspection of the pipe assembly NTM 518000.
   (2) If you find any cracks then you must replace the defective item.
Subtask 21-52-00-380-050-A
C. Repair to the Corrosion Protection Surface
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
   (1) Preparation of the Corrosion Protection Fluid
     (a) Mix the necessary amount of corrosion protection fluid Surface Pretreatment-Light Alloys Chemical Conversion Yellow - (Material No.10ABC1) to the manufacturers instructions.
   (2) Application of the Corrosion Protection Surface
     (a) Use a Textile-Lint free Cotton - (Material No.14SBA1) which is wet with Non Aqueous Cleaner-General - - (Material No.08BAA9) to clean the affected areas.
     (b) Let the area dry.
     (c) Put TAPE - MASKING on the areas where no repair is necessary.
     (d) Use a Textile-Lint free Cotton - (Material No.14SBA1) to apply the corrosion protection fluid Surface Pretreatment-Light Alloys Chemical Conversion Yellow - (Material No.10ABC1) to the affected areas.
NOTE: You must apply three layers of the corrosion protection fluid Surface Pretreatment-Light Alloys Chemical Conversion Yellow - (Material No.10ABC1) 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 Epoxy Adhesive-Non Structural - - (Material No.05EHL8) or an equivalent to powdered or suspect areas of the repair.
       2 Remove the tape quickly, and look to see if the protective finish has been removed with the tape.
       3 If the protective finish has been removed then you must do the repair again.
5. Close-up
Subtask 21-52-00-410-056-A ** ON A/C NOT FOR ALL
A. Close Access
   (1) Install as required:
     (a) The pipe assembly (Ref. AMM TASK 21-52-23-400-001),
     (b) The pipe assembly (Ref. AMM TASK 21-52-23-400-002) and/or
     (c) The pipe assembly (Ref. AMM TASK 21-52-23-400-003).
Subtask 21-52-00-410-056-B ** ON A/C NOT FOR ALL
A. Close Access
   (1) Install as required:
     (a) The pipe assembly (Ref. AMM TASK 21-52-23-400-001) and,
     (b) The pipe assembly (Ref. AMM TASK 21-52-23-400-002).
[Rev.10 from 2021] 2026.04.02 06:11:24 UTC
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