Textron Bell 206L3, Maintenance Manual

Page: 211 / 230

BHT-206L3-MM-1
5-00-00
25 FEB 2011 Rev. 16 Page 179 ECCN EAR99
CONDITIONAL INSPECTIONS
5-57. 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.
• If the stall or surge occurred on the ground or in flight at
any N
R
speed or torque setting and there was a
noticeable yaw of the helicopter, do Part I, Part II, and
Part III of this inspection.