TM 1-1520-238-23
2-40
Change 1
2.12.
CLASSIFICATION OF FUSELAGE DAMAGE AND TYPES OF REPAIR
2.12.5. Impact or Fatigue Damage
Category
Limits
Action
a. Skin or Sheet Metal Holes, Cracks, or Tears
B
Holes: less than 3.00 INCH diameter.
(Clean up 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).
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 can not
exceed 5 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 (clean up can be no closer than
2.00 INCHES to support structure and will
not exceed 5 PERCENT of skin area.)
Repair (TM 1-1500-204-23).
d. Aluminum Honeycomb Panel Cracks, Tears, or Punctures
B
Less than 6.00 INCH diameter in either
direction after repair and clean up.
Repair (TM 1-1500-204-23).
C
Exceeds B or repair will hinder normal
operation or function.
Replace.
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