TM 1-1520-238-23
4-423
4.134.
NO. 1 OR NO. 2 ENGINE SECONDARY NOZZLE CRACK REPAIR (AVIM) – continued
CAUTION
To prevent damage to the cooling fins, all drilling must be performed from the exterior of the nozzle.
To prevent damage to cooling fins, stop drill hole locations may be deviated as required.
c. Stop drill cracks from outside surface of nozzle (TM 1-1500-204-23).
d. Grind weld bead flush, 2.30 INCHES long, with inside surface of nozzle. Use grinder.
e. Perform fluorescent penetrant test on crack and weld areas. Use fluorescent inspection kit
(TM 55-1500-335-23).
f. Remove three existing rivets from angle and nozzle (TM 1-1500-204-23).
g. Fabricate doubler (figure D-264, App D).
CAUTION
To prevent damage to the cooling fins, all drilling must be performed from the exterior of the nozzle.
h. Position doubler in place and match drill three existing holes through doubler for rivet installation.
CAUTION
To prevent damage to cooling fins and to prevent rivets from falling through stop drill holes and cracks,
rivet spacing may be deviated as required.
(1) Transfer remaining hole locations to be drilled to exterior surface of nozzle. Use dividers.
(2) Drill remaining holes through nozzle and doubler. Use #30 drill bit.
(3) Remove doubler and deburr holes.
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