BHT-412-MM-2
5-00-00
15 DEC 2015 Rev. 23 Page 161
Export Classification C, ECCN EAR99
a. Visually examine exterior surface and TEMP-PLATE
overtemperature indicators of outer coupling for discoloration
and evidence of overheating. A change in color of
TEMP-PLATES (from white to black) indicates a possible
overheat condition and/or component degradation. The cause
of TEMP-PLATES and/or exterior surface discoloration shall be
determined and corrected prior to continued operation.
Refer to BHT-412-CR&O for disassembly, cleaning,
assembly, inspection procedures, and wear and
damage limits.
b. Remove retaining ring, end plate, and packing. Remove
retaining ring, retainer, and packing.
c. Check torque of bolt 204-040-612 by applying torque.
Do not exceed 100 foot-pounds (136 Nm). If bolt turns under
torque, inspect for serviceability after removal. Replace as
required. After torque verification, remove bolt 204-040-612.
d. Remove outer coupling and inner crown tooth coupling.
e. Remove inner coupling from outer coupling. Remove
retainer 214-040-633/427-044-121, seal
214-040-812/412-340-004, and housing
214-040-634/427-044-113 from female coupling as an
assembly. Using an arbor press, ensure retainer
214-040-633/427-044-121 is fully seated in housing
214-040-634/427-044-113.
f. Remove all old grease from inner outer coupling teeth
using clean, lint-free cloth. Clean teeth thoroughly.
g. Visually inspect internal spline teeth of male coupling
and mating spline of gear for evidence of fretting and/or
corrosion. Visually inspect teeth of inner and outer coupling for
evidence of wear, pitting, dings, or chipped teeth.
h. Inspect seal 214-040-812/412-340-004, in place for
distortion, cuts, tears, and deterioration.
i. Visually examine wear sleeve of male coupling for
evidence of wear and/or overheating.
5-31. EACH 2500 HOURS OF TAIL ROTOR DRIVE SYSTEM OPERATION (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
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