TM 1-1520-238-23
2-38
2.12.
CLASSIFICATION OF FUSELAGE DAMAGE AND TYPES OF REPAIR
2.12.4. 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 depth.
Repair (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 and Doors
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 shall affect function.
Replace.
e. Step Assembly
B
Less than 10 PERCENT of wall thickness
or 25 PERCENT of tube circumference in
length or width after clean up.
Repair (TM 1-1500-204-23).
C
Exceeds B.
Replace.
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