BELL HELICOPTER 430, Maintenance Manual

Page: 179 / 186

BHT-430-MM-2
5-00-00
26 JAN 2007 Rev. 15 Page 149
CONDITIONAL INSPECTIONS
5-52. 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 is a rumble or a series of
pops, severe engine vibration and a rapid rise in measured gas
temperature (MGT). When a compressor surge is reported do
step 1 through step 6 .
The compressor stall may cause severe torsional loading of the
main driveshaft. The torsional loading can cause scoring of the
transmission input quill gears and damage the main driveshafts.
The tail rotor gearbox attach fitting may also get distorted or
damaged.
1. Power plant:
a. Examine the inlet FOD screen or the particle separator
(if installed) for blockage.
b. Examine the compressor impeller blades for
accumulation of dirt, erosion or foreign object damage.
Rolls-Royce
250-C40B Operation
and Maintenance
Publication CSP
21000 (1) If the blades are found contaminated, clean them
and do a power check. Refer to the engine maintenance
manual.
(2) If the erosion or foreign object damage is more
than the accepted limits, do a tear down inspection. Refer to the
engine maintenance manual.
c. If the compressor stall or surge happened during
acceleration, refer to the engine maintenance manual.