BHT-206L4-MM-1
5-00-00
25 FEB 2011 Rev. 13 Page 167
ECCN EAR99
5-55. ENGINE COMPRESSOR STALL OR SURGE
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
DATE: __________________W.O. _____________________
FACILITY: __________________________________________
HELICOPTER S/N: ___________________________________
REGISTRY NO.: _____________________________________
TOTAL TIME:_______________________________________
SIGNATURE:________________________________________
An engine compressor stall or surge can be
described as a sharp rumble, a series of loud sharp
pops, severe engine vibration, or a rapid rise in
Turbine Outlet Temperature (TOT) depending on the
severity of stall or surge. When a stall or surge is
suspected, follow steps as dictated by reported
conditions.
The components removed from the helicopter for
evaluation following a compressor stall or surge shall
be evaluated as a matched group. The records
accompanying each component shall
cross-reference part and serial numbers of other
drive system components removed for evaluation.
1. Obtain a pilot's report of the circumstances related to the
suspected compressor stall or surge to determine if it
corresponds to one of the following conditions:
• If the stall or surge occurred on the ground or in flight at
any N
R
speed or torque setting and there was no
noticeable yaw of the helicopter, do Part I and Part II of
this inspection.
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