BHT-212-MM-1
5-00-00
Page 228 Rev. 14 26 JUN 2013
Export Classification C, ECCN EAR99
2. Misengagement.
If a sprag clutch has failed to engage, and/or
subsequently engages with or without audible or
physical (helicopter jolt) indications, proceed as
follows:
Pratt & Whitney
Canada PT6T-3/-3B
Maintenance Manual
a. Combining gearbox shall be removed and inspected in
accordance with Pratt & Whitney Canada PT6T-3/-3B
Maintenance Manual.
b. Inspect transmission spiral bevel gear as follows:
SI 212-6 and
Chapter 63
(1) Gain access to left side of transmission and
remove rotor brake and quill assembly.
(2) Utilizing rotor brake quill port opening, inspect all
62 teeth of main spiral bevel gear convex side for unsatisfactory
conditions such as scoring, hard lines, nicks, dents, chipping,
metal deformation, etc. Inspect all 62 teeth on spiral bevel gear
concave side. Refer to Figure 5-6 for unacceptable conditions of
spiral bevel gear.
Inspection mirrors and a suitable light are required.
Turn rotor slowly to permit inspection of all gear
teeth.
SI 212-6 and
BHT-212-CR&O
(3) Remove and replace any gear that does not meet
inspection requirements set forth in step (2). Overhaul rotor
brake quill.
5-56. AFTER ENGINE COMBINING GEARBOX CLUTCH NONENGAGEMENT,
MISENGAGEMENT, OR IN-FLIGHT SLIPPAGE (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
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