BHT-412-MM-2
5-00-00
Export Classification C, ECCN EAR99
BHT-412-CR&O 25. Inspect components in drive sump assembly 212-040-365:
a. Inspect mating surface and pilot diameter for evidence
of fretting and wear.
b. Remove and inspect sump output quill assembly. Do
not disassemble.
c. Visually inspect pinion 212-040-151 teeth for evidence
of wear, scoring, and pitting. Inspect tooth contact pattern.
d. Check freedom from binding and smoothness of roll of
bearings by rotating pinion gear by hand.
e. Visually inspect tail rotor input gear teeth for evidence of
wear, scoring, and pitting through the output quill bore. Inspect
gear tooth contact pattern. Do not remove input quill.
f. Check freedom from binding and smoothness of roll of
bearings by rotating pinion by hand.
g. Remove oil pump and visually examine spline for
general condition. Rotate pump by hand and check for freedom
of rotation.
h. Remove accessory quill (hydraulic and tach drive).
Visually examine pilot diameters and mating flanges for
evidence of wear and/or corrosion.
i. Visually inspect hydraulic pump and tachometer drive
gear for excessive wear, scoring, and pitting. Inspect tooth
contact pattern.
j. Check freedom from binding and smoothness of roll of
bearings by manually rotating gear 212-040-149.
k. Remove, inspect, and clean, chip detector 212-040-122
and screen assembly 204-040-237 for foreign material and
No. 4 oil jet for evidence of clogging.
l. Visually examine oil pump shaft, through pump bore in
case, for general condition of lower spines.
BHT-412-CR&O 26. Assemble transmission.
5-34. EACH 3000 HOURS OF TRANSMISSION (412-040-004) OPERATION (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
26 FEB 2013 Rev. 16 Page 183/184
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