BHT-412-MM-2
5-00-00
15 DEC 2015 Rev. 23 Page 225
Export Classification C, ECCN EAR99
5-43. AFTER ENGINE COMBINING GEARBOX CLUTCH NON-ENGAGEMENT,
MISENGAGEMENT, OR IN-FLIGHT SLIPPAGE
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
DATE: __________________W.O. _____________________
FACILITY: __________________________________________
HELICOPTER S/N: ___________________________________
REGISTRY NO.: _____________________________________
TOTAL TIME:_______________________________________
SIGNATURE:________________________________________
Accomplish after engine combining gearbox clutch
nonengagement, misengagement, or in-flight
slippage.
A nonengaged engine is indicated by near zero
torque, higher N
2
, and much cooler ITT as
compared to engaged engine.
AFTER ENGINE COMBINING GEARBOX CLUTCH
NONENGAGEMENT, MISENGAGEMENT, OR IN-FLIGHT
SLIPPAGE
Pratt & Whitney
Canada Engine
Maintenance Manual
1. Non-engagement — perform inspection in accordance
with applicable Pratt & Whitney Canada Engine Maintenance
Manual.
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:
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