Chapter 7 - Bell 206L4 Maintenance Manual

BHT-206L4-MM-1
5-55. ENGINE COMPRESSOR STALL OR SURGE (CONT)
DATA REFERENCE
Rolls-Royce 250-C30
Series Operation and
Maintenance Manual,
14W2
5-00-00
Page 168 Rev. 18 7 JUN 2013
CONDITIONAL INSPECTIONS
INSPECTION TASK DESCRIPTION
• If the stall or surge occurred on the ground or in flight at
any N speed or torque setting and there was a
R
noticeable yaw of the helicopter, do Part I, Part II, and
Part III of this inspection.
PART I: INVESTIGATE CAUSE OF COMPRESSOR
STALL OR SURGE
POWER PLANT
1. Examine the induction fairing for blockage. If the induction
fairing is found obstructed, refer to the appropriate Rolls-Royce
Operation and Maintenance Manual for further maintenance
action. If no blockage is found, do step 2.
2. Remove the induction fairing and examine the compressor
intake area as follows:
a. Examine the compressor rotor for contamination. If
contamination is found, perform a compressor wash. Refer to
applicable BHT-206L4-MM-9, Chapter 71.
b. Inspect compressor rotor for foreign object damage in
accordance with the appropriate Rolls-Royce Operation and
Maintenance Manual for proper action.
3. If step 1 and step 2 do not reveal an obvious cause for stall
or surge, refer to the appropriate Rolls-Royce Operation and
Maintenance Manual for further maintenance action.
MECH OTHER
Export Classification C, ECCN EAR99
INITIAL