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 TM 9-2320-303-24-2
CAB BODY REPAIR - CONTINUED
0289 00
ALUMINUM REPAIR - CONTINUED
4.
Joint Design.
a.
Loads are applied through joint to fasteners holding joint together. These loads are applied to fasteners in form of
shear loads or tension loads. If load is perpendicular to axis of fasteners, fastener is loaded in shear. Fastener is
loaded in tension when load is along axis of fastener, causing pull on each end of fastener.
b.
Rivets (1) are designed to be loaded in shear. Do not create new joints during repairs that cause rivets to be used in
tension application. Bolts (2) should be used for tension applications or substituted for rivets in very high shear
load applications.
1
1
RIVETS LOADED IN SHEAR
2
2
BOLTS REPLACING RIVETS LOADED IN TENSION
Repair Parts Preparation.
5.
a.
Paint repair parts or patches with epoxy primer before installation.
b.
Apply sealing compound to mating surfaces to prevent corrosion.
c.
Install part or patch as detailed in Repair by Patching and Repair by Insertion on pages 0289 00-12 and 0289 00-
13.
d.
Paint repaired area with epoxy primer.
e.
Paint repaired area with polyurethane, as required.
6.
Repair of Negligible Damage.
a.
Negligible cracks, as defined in classification above, are repaired by drilling small hole at each end of crack to stop
crack propagation. This is called stop drilling. Table 8 gives proper drill sizes for stop drilling cracks.
b.
Negligible holes are repaired by rounding and smoothing edges of hole to alleviate stress risers caused by sharp
notches.
CAUTION
Never use heat to reform parts. Heat greatly reduces part strength.
c.
Small dents and distorted areas may be repaired by bending or hammering as long as operation does not cause
materials to crack or tear. Sharp bends should not be attempted.
0289 00-11
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