TM 1-1520-238-23
2-372
2.103.
CLASSIFICATION OF EMPENNAGE DAMAGE AND TYPES OF REPAIR – continued
2.103.4. Types of Damage (Examples): Limits and Action
Category
Limits
Action
a. Type: Skin Corrosion
A
Less than 20 percent of skin thickness
and no more than 25 percent of panel
area.
Remove corrosion (para 1.49).
B
More than 20 percent of skin thickness
and less than 50 percent of panel area
with no effect on adjacent structure.
Patch repair (TM 1-1500-204-23) not to
exceed 25 percent of total panel area.
C
More than 50 percent of panel area and
skin thickness.
Replace affected area with patch repair
(TM 1-1500-204-23).
b. Type: Skin or Sheet Metal Holes, Cracks, or Tears
A
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B
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C
No cracks or tears more than 25 percent
of shortest skin panel dimension.
Clean up and patch repair
(TM 1-1500-204-23).
No holes greater than 3.00 INCHES in
diameter (clean up can be no closer than
2.00 INCHES to support structure).
Clean up and patch repair
(TM 1-1500-204-23).
2.103.5. 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 area.
C
Greater than minor damage.
Replace.
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