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SDR CA150420006

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Service difficulty report · Engine · Bolkms BK117B2

FAA SDR system

Difficulty date
April 7, 2015
Submitted
August 5, 2015
Operation
General aviation
Make and model
Bolkms BK117B2
Aircraft time
9,282 hours
Engine
Lyc LTS101750B1
System (JASC)
7200 · Engine (Turbine/Turboprop)
Part
Engine
Condition
Malfunctioned
Location
Nr 2
Stage of operation
DE
How discovered
O
Nature of condition
Y, M, J
Precautionary procedure
R, A

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

What was found

(CAN) DURING AN AUTOROTATION FOR INITIAL PILOT TRAINING BOTH ENGINES THROTTLES WERE RETARDED TO IDLE. IMMEDIATELY FOLLOWING THE AUTOROTATION ENTRY NR 2 ENGINE N2 WAS SEEN DECREASING THROUGH 60 PERCENT AND N1 WAS NEAR 40 PERCENT. AN OVERSHOOT WAS COMMENCED WITH NR 1 ENGINE SET TO FLIGHT. WHEN ATTEMPTING TO RECOVER N1 WITH STARTER ENGAGED. THE TOT SURGED TO 830 DEGEES C AND THE THROTTLE WAS CUT OFF. A RESTART WAS CARRIED OUT AND THE ENGINE CONTINUED TO OPERATE NORMALLY IF LEFT IN THE FLY POSITION. THE ENGINE HAS BEEN REMOVED AND SENT TO AN ENGINE REPAIR FACILITY FOR FURTHER INVESTIGATION.