TM 1-1520-238-23
2-39
2.12.
CLASSIFICATION OF FUSELAGE DAMAGE AND TYPES OF REPAIR – continued
Category
Action
Limits
f. Main Landing Gear Cross Tube
A
Less than 25 PERCENT of cross section
and less than 10 PERCENT of thickness
or 0.040 INCH depth (whichever is less).
(Damage must clear fastener holes or
threads by 0.050 INCH minimum.)
Repair (TM 1-1500-204-23).
B
Exceeds A.
Replace.
g. Engine Mount Supports
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
counterbores by 0.050 INCH minimum.)
Repair (TM 1-1500-204-23).
B
Exceeds A.
Replace.
h. Mast Support Base Lightening Holes
A
Maximum allowable depth for triangular
cavity: Inboard curved walls are 0.265
INCH; outboard curved walls are 0.265
INCH; 1.00 INCH from base of triangle to
3.10 INCHES outboard is 0.265 INCH;
side walls are 0.125 INCH. Use flashlight
and mirror.
Perform impression inspection (para
2.88).
Maximum allowable depth for circular
cavity: Side walls are 0.125 INCH;
remaining inside walls and bottom of
cavities are 0.265 INCH. Use flashlight
and mirror.
Perform impression inspection (para
2.88).
B
Exceeds A.
Replace.
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