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BHT-206L4-MM-1

5-00-00

Page 168 Rev. 18 7 JUN 2013 Export Classification C, ECCN EAR99

• If the stall or surge occurred on the ground or in flight at

any N

speed or torque setting and there was a

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

Rolls-Royce 250-C30

Series Operation and

Maintenance Manual,

14W2

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.

CONDITIONAL INSPECTIONS

5-55. ENGINE COMPRESSOR STALL OR SURGE (CONT)

DATA REFERENCE INSPECTION TASK DESCRIPTION

INITIAL

MECH OTHER

Bell 206L User Manual

Other manuals for Bell 206L