SDR 2017FA0000065

Service difficulty report · Gcu · Amd FALCON50MYST

Difficulty date: August 25, 2016
Submitted: February 17, 2017
Operation: General aviation
Aircraft: N733G
Make and model: Amd FALCON50MYST
Aircraft serial: 340
Aircraft time: 4,240 hours, 2,373 cycles
System (JASC): 2421 · AC Generator-Alternator
Part: Gcu
Condition: Malfunctioned
Location: Nr 1
Stage of operation: TX
How discovered: 9
Nature of condition: O
Precautionary procedure: O

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

What was found

DURING NR 1 ENGINE START, STARTER DID NOT DISENGAGE. STARTER TOOK N1 TO 35% AND KEPT GOING, IGNITION ALSO REMAINED ON. SELECTED MOTOR START/STOP TO DISENGAGE THE STARTER. THREE MESSAGES PRESENT, ENG1/DEEC CAPABLE, ENG1/CHECK ECTM, AND DEEC ACQUISITION FAULT. NEXT START WAS NORMAL. REMOVED AND REPLACED THE NR 1 GCU.