SDR CA120118002

Service difficulty report · Drive Unit · Grob G120A

Difficulty date: January 17, 2012
Submitted: September 14, 2015
Operation: General aviation
Make and model: Grob G120A
Aircraft time: 2,337 hours
Engine: Lyc AEIO540D4D5
Propeller: Hartzl HCC3YR
System (JASC): 2750 · Trailing Edge Flap Control System
Part: Drive Unit
Part number: 120A4280
Condition: Failed
Location: Te Flaps
Part time: 9 hours
Stage of operation: AP
How discovered: O
Nature of condition: J
Precautionary procedure: A

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

What was found

(CAN) FLAP SYSTEM CIRCUIT BREAKER POPPED WHEN FLAPS OPERATED. TROUBLESHOOTING SHOWED SYS DREW 18 AMPS WHEN COLD SOAKED, OAT -20C. AFTER BEING HEATED IN HANGAR FOR 4 HOURS, THE FLAP SYSTEM DREW 6 AMPS. WHEN COLD SOAKED, FLAP DRIVE UNIT ALONE DREW 15 AMPS.

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