TM 9-2330-392-14&P
5-5.
CARGO BODY REPAIR (Con’t).
e.
REPAIR PARTS PREPARATION
1.
Repair parts or patches should be painted with epoxy primer before installation.
2.
Apply sealing compound (item 12, Appendix E) to mating surfaces to prevent corrosion.
3.
Install part as detailed in Subparagraph g, Repair by Patching, or Subparagraph h, Repair by Insertion.
4.
Refer to Section XIH, Chapter 4, for instructions on painting.
f.
REPAIR OF NEGUGIBLE DAMAGE
1.
Negligible cracks are repaired by drilling a small hole at each end of crack to stop crack propagation. This is called
"stop drilling." Table 5-1 gives proper drill sizes for ’stop drilling" cracks.
2.
Negligible holes are repaired by rounding and smoothing edges of hole to alleviate stress risers caused by sharp
notches.
CAUTION
Heat should never be used to reform parts because it greatly reduces part strength.
3.
Small dents and distorted areas may be repaired by bending or hammering, as long as the operation does not cause
materials to crack or tear. Sharp bends should not be attempted.
Table 5-1. Stop Drill Sizes for Negligible Cracks
Sheet Thickness (in.)
Minimum Stop Drill Size No.
0 to .032
40
0.033 and thicker
30
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