SDR HEEA123017

Service difficulty report · Hmu · Bell 407

Difficulty date
January 5, 2009
Submitted
October 16, 2009
Operation
Air carrier
Aircraft
N401PH
Make and model
Bell 407
Aircraft serial
53615
Aircraft time
1,286 hours
Engine
Allsn 250C47B
Part
Hmu
Part number
23078031
Part serial
JGALM0411
Condition
Malfunctioned
Location
Engine
Part time
3,795 hours
Stage of operation
IN
How discovered
9
Nature of condition
O
Precautionary procedure
K

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

What was found

AIRCRAFT YAWED LEFT SUDDENLY FOLLOWED IMMEDIATELY BY DECREASE IN ENGINE NOISE, LOSS IN ALTITUDE, ACTIVATION OF LOW RPM AUDIO AND FADEC FAIL AUDIO. CAUTION LIGHTS THAT ILLUMINATED WERE FADEC FAIL, FADEC DEGRADED, RESTART FAULT, AUTO RELIGHT AND RPM, FADEC MODE SELECT TO MANUAL CONTROL. REMOVED HMU AND SENT TO REPAIR STATION FOR BENCH CHECK AS RECEIVED. NOTE: PREVIOUSLY SUBMITTED ON 2/6/09.

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