A320飞机维护手册 AMM ICE AND RAIN PROTECTION 防冰和排雨1(80)

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 B. Damaged flats.  Damage is permitted if the end fittings can keep the correct torque value.  If the end fittings cannot keep the correcttorque replace the hose(Ref. TASK 30-21-49-000-043) and (Ref. TASK 30-21-49-400-043).
 C. Safety wire hole damaged or worn.  Damage is permitted if the metal around the hole is not cracked or  Blend out damage. Ifnecessary drill a hole inthe undrilled corner. The
 torn.  new hole must be the same
 One undrilled corner  diameter and distance from
 must remain.  the end of the nut as the
 old hole.

 3. Examine the muscle pressure line forward and aft tube assemblies, look for:

 A. Cracks, splits or kinks.  None permitted.  Replace the tube(Ref. TASK 30-21-49-000-043) and (Ref. TASK 30-21-49-400-043).
 B. Wrinkles in bends.  Maximum depth cannot be more than 3 percent of the tube diameter or 0.060 in. (1.52 mm) which ever is smaller.  If wrinkles are more thanthe allowable limits,replace the tube(Ref. TASK 30-21-49-000-043) and (Ref. TASK 30-21-49-400-043).
 C. Dents.  Maximum depth cannot be more than 10 percent of the tube outside diameter. Maximum radius must be less than 2 times the wall thickness. If the dents are more thanthe allowable limits,replace the tube(Ref. TASK 30-21-49-000-043) and (Ref. TASK 30-21-49-400-043).

 1EFF : ALL 1 30-21-49Page 611 1 1 Feb 01/99R 1 1 1CES 1

 -------------------------------------------------------------------------------
INSPECT/CHECK  MAXIMUM REMARKS
 SERVICEABLE LIMITS

 -------------------------------------------------------------------------------Maximum of 2 dents for each 1 ft. (0.30 m) of tube length.
 D. Flat areas.  Maximum flat area cannot If the flat areas are more be more than 2 times the than the allowable limits, tube outside diameter. replace the tube The contour change (Ref. TASK 30-21-49-000-cannot be more than 10 043) and (Ref. TASK 30-21-percent of the tube 49-400-043). outside diameter.
 E. Nicks, scratches,  Maximum depth cannot be If the damage is more than chafing. more than 10 percent of the allowable limits,
 the wall thickness.  replace the tube (Ref. TASK 30-21-49-000-043) and (Ref. TASK 30-21-49-400-043).
 4. Examine the anti-ice system forward duct, look for:
 A. Wrinkles in bends.  Maximum depth must be If the damage is more than less than 5 percent of the allowable limits, the duct diameter. replace the duct
 (Ref. TASK 30-21-49-000-044) and (Ref. TASK 30-21-49-400-044).
 B. Dents.  Maximum depth must be If the dents are less than less than 20 percent of the allowable limits, the tube outside repair the dents (Ref.
R diameter. CFMI ESM 72-09-03). If the R Maximum radius of the dents are more than the R dent must be less than 2 allowable limits, replace R times the duct wall the duct (Ref. TASK 30-21-
thickness. 49-000-044) and (Ref. TASK Maximum of 4 dents per 30-21-49-400-044). each 1 ft. (0.30 m) of duct. Minimum distance of 1 in. (25.4 mm) between dents.

 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
No limit to dents
 allowed except in bends, no dents are allowed in
 bends.
R R R R  C. Flat areas.  Maximum length must be less than 3 times the outside diameter of the duct. Contour change must be less than 20 percent of the outside diameter of the duct.  If the flat areas are lessthan the allowable limits, repair them (Ref. CFMI ESM 72-09-03). If the flat areas are more than the allowable limits, replacethe duct (Ref. TASK 30-21-49-000-044) and (Ref. TASK 30-21-49-400-044).
R R R R  D. Nicks, scratches, chafing in straight section.  Maximum depth must be less than 10 percent of the wall thickness of the duct. There is no limit to the number of nicks, scratches or chafing allowed in the straight section of the duct.  If the damage is less thanthe allowable limits,repair the damage (Ref. CFMI ESM 72-09-03). If the damage is more than the allowable limits, replace the duct (Ref. TASK 30-21-49-000-044) and (Ref. TASK30-21-49-400-044).
R R R R  E. Nicks, scratches, chafing in bends.  Maximum depth must be less than 10 percent of the wall thickness of the duct.  If the damage is less thanthe allowable limits,repair the damage (Ref. CFMI ESM 72-09-03). If the damage is more than the allowable limits, replace the duct (Ref. TASK 30-21-49-000-044) and (Ref. TASK 30-21-49-400-044).
R  F. Splits, cracks, kinks  Maximun length must be less than the duct outside diameter.  If the damage is less thanthe duct OD do the weldrepair (Ref. CFMI ESM 72-09-03 Repair No. 3).
　
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