TM 1-1520-238-23
2-461
2.129.
CLASSIFICATION OF NACELLE DAMAGE AND TYPES OF REPAIR – continued
2.129.5. Impact or Fatigue Damage
Category
Limits
Action
a. Skin or Sheet Metal Holes, Cracks, or Tears
B
Holes: less than 3.00 INCHES in
diameter. (Cleanup can be no closer than
2.00 INCHES to supporting structure, and
no more than 5 percent of skin area.)
Clean up and patch repair
(TM 1-1500-204-23).
B
Cracks or tears: no longer than 25 percent
of shortest skin dimension.
Clean up and patch repair
(TM 1-1500-204-23).
b. Skin or Sheet Metal Nicks or Scratches
A
Less than 10 percent of material
thickness.
Clean up (para 1.47). (Area cannot
exceed 4.00 SQUARE-INCHES.)
B
Deeper than 10 percent but less than 25
percent of material thickness.
Clean up (para 1.47). (Area cannot
exceed five percent of skin area and can
be no closer than 2.00 INCHES to
supporting structure.)
C
Exceeds B.
Replace.
c. Skin Dents
A
Smooth dents less than 0.25 INCH deep.
Repair (TM 1-1500-204-23).
B
Dents with nicks or gouges or deeper than
0.25 INCH.
Patch repair (TM 1-1500-204-23). (Treat
dents as holes.)
C
Dents greater than 3.00 INCHES in
diameter or cleanup will exceed 5 percent
of skin area or will be closer than 2.00
INCHES to supporting structure.
d. Door Cracks, Tears, and Punctures
B
Less than 25 percent length of shortest
dimension.
Repair (TM 1-1500-204-23).
C
Exceeds B.
Replace.
GO TO NEXT PAGE
