TM 1-1520-238-23
2-424
2.117.
CLASSIFICATION OF WING DAMAGE AND TYPES OF REPAIR – continued
2.117.4. Corrosion
Category
Limits
Action
a. Structural
A
Less than 10 percent of material thickness
across 25 percent of cross section.
Remove corrosion (para 1.49).
B
Greater than 10 percent of material
thickness but less than 50 percent of
cross section.
Patch repair (TM 1-1500-204-23) as long
as area remaining allows attaching repair.
C
Greater than minor damage.
Replace.
b. Castings, Forgings
A
Less than 25 percent of cross section and
less than 10 percent of thickness or 0.040
INCH deep.
Repair corroded area
(TM 1-1500-204-23).
B
Exceeds A.
Replace.
c. Fasteners, Bearings, and Bushings
A
Removable or allowed to remain without
affecting size or function.
Repair (TM 1-1500-204-23).
B
Exceeds A.
Replace.
d. Covers
A
Not applicable.
B
Less than 10 percent of material thickness
and less than 4.00 SQUARE-INCHES
after clean up.
Repair (TM 1-1500-204-23).
C
Exceeds B or repairs will affect function.
Replace.
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