TAIL ROTOR GEARBOX INPUT GEAR SEAL ASSEMBLY REMOVAL/INSTALLATION continued
a. Clean removed and attaching parts or surfaces (para 1.47).
a. Check retainer for nicks, gouges, and burrs.
(1) Repair damage 0.040 INCH or less deep by blending. Use depth gage.
(2) On mounting surface, repair damage 0.020 INCH or less deep by blending. Use depth gage.
b. Check retainer for loose or damaged clinch nuts (TM 1-1500-204-23).
c. Check retainer for elongated bolt holes. None allowed.
d. Check retainer and seal assembly for cracks. None allowed.
e. Check retainer and seal assembly for corrosion (para 1.49).
f. Check gearbox housing mating surface studs for damaged threads. None allowed.
g. Check seal assembly for scratches, nicks, and gouges. Casting defects on non-mating surfaces are
h. Check seal assembly carbon seal air gap measurement.
(1) Measure air gap between carbon seal surface and mating surface. Use gap setting gage.
(2) If less than 0.012 INCH, replace seal.
i. Check seal assembly for wear step on carbon seal mating surface (highly polished surface). None
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