TM 1-1520-238-23
5-256.4
Change 4
5.57A.
TAIL ROTOR HUB ASSEMBLY REMOVAL/INSTALLATION (AVIM) – continued
5.57A.5. Inspection
a. Check tail rotor fork for cracks and deformations. None allowed.
b. Check tail rotor fork for nicks, scratches, gouges, and dents (para 5.51).
c. Check tail rotor fork teeter stops, shoes, and securing holes for wear damage:
(1) Nicks, scratches, gouges, galling, scoring, and dents are acceptable if less than 0.010 INCH deep.
(2) Superficial scratches are acceptable if no material is raised above surrounding surface.
d. Check four rubber bumpers for looseness, splits, or deterioration. None allowed.
e. Check four elastomeric bearings for condition and looseness (para 5.51).
f. Check strap pack for broken, loose, deformed, or cracked strap laminates. None allowed.
(1) Acceptable for the outboard shoes on the strap pack to pivot in relation to the laminates.
g. Check strap pack for corrosion (para 1.49).
(1) Check strap laminates for pits. None allowed.
(2) Check strap for discoloration. Clean (para 1.47).
(3) Corrosion not to exceed 0.005 INCH on inboard or outboard shoes including diameter of teetering hole.
h. Check threaded bushings and teetering bolts for corrosion, cracks, or damaged threads. None allowed.
i. Check hub for cracks and damaged threads. None allowed.
j. Check hub for scratches, gouges, dents, and corrosion.
(1) Surface damage located within 3 INCHES of hub center may be blended out.
(2) Damage not to exceed 0.020 INCH.
k. Check hub for corrosion (TM 55-1500-344-23).
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