Textron Bell 412, Руководство по обслуживанию

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BHT-412-MM-2
5-00-00
Page 166
Rev. 16 26 FEB 2013 Export Classification C, ECCN EAR99
b. Inspect hanger and outer coupling TEMP-PLATES
overtemperature indicators and exterior surfaces for
discoloration and overheat condition. A change in color of
TEMP-PLATES (from white to black) indicates a possible
overheat condition and/or possible component degradation. The
cause of discoloration shall be determined and corrected prior
to continued operation.
c. Inspect shaft and outer coupling for nicks, dents,
enlarged holes, and cracks.
d. Inspect bearing for grease leakage and dislocation of
bearing seals.
e. Inspect bearing in hanger for smoothness of rotation
and binding by manually rotating bearing.
BHT-412-CR&O 5. Disassemble coupling assembly for internal inspection as
follows:
a. While holding end plate against spring, remove
retaining ring. Remove end plate and spring. Visually examine
end plate spring and retaining ring for evidence of wear and/or
corrosion.
b. Remove cotter pin. Check torque on nut by applying
torque. Do not exceed 50 inch-pounds (5.65 Nm). If nut rotates
under torque, inspect attachment hardware for serviceability.
Replace as required.
c. Remove bolt, nut, and plates. Visually examine faying
surfaces of plates for evidence of wear and/or corrosion.
Remove inner and outer couplings and sleeve from shaft.
d. Remove inner coupling from outer coupling. Remove
retaining ring. Remove retainer, seal, and housing from female
coupling as an assembly. Using an arbor press, ensure retainer
is fully seated in housing.
e. Remove sleeve from inner coupling and inspect for
evidence of wear and/or corrosion.
SPECIAL INSPECTIONS
5-31. EACH 2500 HOURS OF TAIL ROTOR DRIVE SYSTEM OPERATION (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER