-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
Maximun length same as
or more than the duct
outside diameter.
R
R
R
If the damage is the sameas or more than the ductOD do the doubler and section repair (Ref. CFMI ESM 72-09-03 Repair No. 4).
5. Examine the anti-ice system middle duct, look for:
A. Wrinkles in bends. Maximum depth must be
less than 5 percent of
the duct diameter.
B. Dents. Maximum depth must be
less than 20 percent of
the tube outside
R diameter.
R Maximum radius of the
R dent must be less than 2
R times the duct wall
thickness.
Maximum of 4 dents per
each 1 ft. (0.30 m) of
duct.
Minimum distance of 1
in. (25.4 mm) between
dents.
No limit to dents
allowed except in bends,
no dents are allowed in
bends.
If the damage is more thanthe allowable limits,replace the duct (Ref. TASK 30-21-49-000-045) and (Ref. TASK 30-21-49-400-045).
If the dents are less thanthe allowable limits,repair the dents (Ref. CFMI ESM 72-09-03). If the dents are more than the allowable limits, replace the duct (Ref. TASK 30-21-49-000-045) and (Ref. TASK30-21-49-400-045).
-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
C. Flat areas. Maximum length must be If the flat areas are less
less than 3 times the than the allowable limits,
R outside diameter of the repair them (Ref. CFMI ESM
R duct. 72-09-03). If the flat
R Contour change must be areas are more than the
R less than 20 percent of allowable limits, replace
the outside diameter of the duct (Ref. TASK 30-21-
the duct. 49-000-045) and (Ref. TASK
30-21-49-400-045).
D. Nicks, scratches, Maximum depth must be If the damage is less than
chafing in less than 10 percent of the allowable limits,
straight section. the wall thickness of repair the damage (Ref.
R the duct. CFMI ESM 72-09-03). If the
R There is no limit to the damage is more than the
R number of nicks, allowable limits, replace
R scratches or chafing the duct (Ref. TASK 30-21-
allowed in the straight 49-000-045) and (Ref. TASK
section of the duct. 30-21-49-400-045).
E. Nicks, scratches, Maximum depth must be If the damage is less than
chafing in bends. less than 10 percent of the allowable limits,
the wall thickness of repair the damage (Ref.
R the duct. CFMI ESM 72-09-03). If the
R damage is more than the
R allowable limits, replace
R the duct (Ref. TASK 30-21-
49-000-045) and (Ref. TASK
30-21-49-400-045).
F. Splits, Maximun length must be If the damage is less than
cracks, less than the duct the duct OD do the weld
kinks outside diameter. repair (Ref. CFMI ESM
R 72-09-03 Repair No. 3).
Maximun length same as If the damage is the same
or more than the duct as or more than the duct
outside diameter. OD do the doubler and
R section repair (Ref. CFMI
R ESM 72-09-03 Repair No.
R 4).
6. Examine the anti-ice system upper duct, look for:
-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
A. Wrinkles in bends.
B. Dents.
R R R R C. Flat areas.
R R R R Maximum depth must be less than 5 percent of the duct diameter.
Maximum depth must be less than 20 percent of the tube outside diameter. Maximum radius of the dent must be less than 2 times the duct wall thickness. Maximum of 4 dents per each 1 ft. (0.30 m) of duct. Minimum distance of 1 in. (25.4 mm) between dents. No limit to dents allowed except in bends, no dents are allowed in bends.
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