TM 1-1520-238-23
2-460
Change 1
2.129.
CLASSIFICATION OF NACELLE DAMAGE AND TYPES OF REPAIR – continued
2.129.4. Corrosion
Category
Limits
Action
a. Structural
A
Less than 10 percent of material thickness
of 0.040 INCH depth across 25 percent of
cross section. Damage must clear fillets
and fastener holes by 0.50 INCH
minimum.
Remove corrosion (para 1.49).
B
Exceeds A.
Replace.
C
Impact or fatique damage, cracks, or
loose mounting – none allowed.
Replace or tighten.
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. Doors
A
Not applicable.
B
Less than 10 percent of material thickness
and less than 4.00 SQUARE-INCHES
after cleanup.
Repair (TM 1-1500-204-23).
C
Exceeds B or repairs will affect function.
Replace.
e. Engine Mount Support
A.
Less than 25 percent of cross section and
less than 10 percent of thickness or 0.040
INCH in depth. Damage must clear fillets
and fastener holes or counterparts by
0.50 INCH minimum.
Repair (TM 1-1500-204-23).
B.
Exceeds A.
Replace.
GO TO NEXT PAGE
