TM 1-1520-238-23
5-222.4
Change 5
5.49A.
MAIN ROTOR LOWER SHOE SCISSOR ATTACH SLEEVE BEARINGS REPLACEMENT – continued
5.49A.4. Cleaning
a. Clean mating bore and surrounding surfaces on lower shoe. Use dry cleaning solvent (item 74, App F)
and cloth (item 52, App F).
5.49A.5. Inspection
a. Check lower shoe for cracks. None allowed.
b. Check mating bore inside diameter in lower shoe for corrosion, scratches, nicks, and scoring. Damage
less than 0.005 INCH deep may be blended out.
CAUTION
Repair is limited to replacement of same size bearing only. If bore in main rotor head lower shoe is out
of tolerance for installation of same size bearing that was removed, the main rotor head must be
returned to depot for repair.
c. Measure and record diameter of mating bore in lower shoe for serviceable dimension. Use cylinder gage
and caliper. Record dimension.
(2) Mating bore diameter shall not exceed maximum listed in table at beginning of task.
(3) Out-of-roundness tolerance shall not exceed one-half the diametrical (size) tolerance listed in table at
beginning of task. The tolerance shall be maintained for the total depth of the housing mating bore. Use
cylinder gage and caliper.
d. Measure and record outside diameter of replacement sleeve bearing. Use caliper. Record dimension.
e. Verify interference fit of 0.001 – 0.0025 INCH between sleeve bearing and mating bore in lower shoe.
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