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SDR QMLA2011093011097

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Service difficulty report · Engine · Bolkms BK117A4

FAA SDR system

Difficulty date
September 30, 2011
Submitted
October 14, 2011
Operation
Air carrier
Aircraft
N424MB
Make and model
Bolkms BK117A4
Aircraft serial
7082
Aircraft time
10,630 hours, 40,759 cycles
Engine
Lyc LTS101650B1
Engine time
9,097 hours, 18,938 cycles
System (JASC)
7200 · Engine (Turbine/Turboprop)
Part
Engine
Condition
Power Loss
Stage of operation
AA
How discovered
O
Nature of condition
R, J
Precautionary procedure
A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

THE PILOT REPORTED, AFTER PREFLIGHT AND CONFIRMATION CHECKS WERE CONDUCTED, LIFTED TO HOVER. USED THE ENGINE BEEP SWITCH TO SLIGHTLY INCREASE THE NR/N2 RPM TO 100 PERCENT. ON CLIMBOUT REACHING 900 FEET MSL, REDUCED COLLECTIVE TO 50 % ENGINE TORQUE TO ASSESS VISIBILITY IN RAIN AND NOTED NR/N2 DECREASED TO 99 %. THIS OUT OF NORM, PILOT TRIED USING THE BEEP SWITCH TO INCREASE THE NR/N2 BACK TO 100 %. WITH NO RESPONSE TO COMMAND AND BY INCREASING COLLECTIVE TO 60 % TORQUE WITH NO RESPONSE. PILOT ELECTED TO ABORT FLIGHT AND RETURNED TO BASE IAW RFM EMERGENCY INSTRUCTIONS UNDER DROOP COMPENSATION FAILURE.