Service difficulty report · Unknown · Casa C212CC

Difficulty date
July 17, 2009
Submitted
July 20, 2009
Operation
Air carrier
Aircraft
N423C
Make and model
Casa C212CC
Aircraft serial
240
Aircraft time
15,946 hours, 18,288 cycles
Engine
Garrtt TPE33110R
Engine time
19,542 hours, 19,288 cycles
Propeller
Hartzl HCB4M
Part
Unknown
Condition
Unknown
Stage of operation
CR
How discovered
O
Nature of condition
J
Precautionary procedure
E, A

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

What was found

APPROX 15 MIN AFTER DEPARTURE, NR 2 GEN LIGHT CAME ON. SUCCESSFUL RESET. 5-10 MIN LATER SUDDEN YAW TO RIGHT. CREW SUSPECTED ENG FAILURE. CONFIRMED, SECURED ENGINE & RETURNED TO DEPARTURE. SUSPECTED HIGH EGT TEMPS NO RESTART ATTEMPT. LANDED SAFELY WITH NO INCIDENT. CONTACTED MFR, PERFORMED ENGINE INSP, REMOVED & INSPECTED ALL FUEL FILTERS & FLOW/DIVIDER. SUSPECT FUEL DELIVERY PROBLEM. VERIFIED NO BLOCKAGE AT P2T2 SENSE LINE PERFORMED ENGINE FLAMEOUT CHECK, NO DEFECTS NOTED. PERFORMED ENGINE RUNS, NO DEFECT NOTED. MFG FIELD ENGINEER INDICATES THAT ELECTRICAL SPIKE PRECIPITATED A SPURIOUS EGT ELEVATION, THAT REACHING PRESET TEMP, ACTIVATED AUTOMATIC FUEL FLOW REDUCTION TO PRECLUDE ENGINE OVERTEMP. RESULTING IN POWER LOSS & RESULTANT YAW, GIVING SENSATION OF FLAMEOUT. WITH A SPURIOUS EGT SPIKE, CREW FOLLOWED PROCEDURE IN SHUTTING DOWN ENGINE. IT APPEARS HIGHLY UNLIKELY THE TEMP SPIKE WAS ACCURATE OR THAT ENGINE ACTUALLY FLAMEDOUT OR SHUTDOWN AUTOMATICALLY. CONSENSUS OF OPINION IS THE CREWS ARE ON THE RT TRACK LOOKING FOR AN ELECTRICAL FAULT AS THE RAPIDLY FLUCTUATING EGT AFTER CYCLING GENERATOR ON GROUND POINTS TO A RESULTANT SPIKE IN CURRENT AS WELL. TROUBLESHOOTING THE WIRING HARNESSES ANYTHING THAT COULD PRECIPITATE THE PROBLEM IT IS NOT FELT EITHER COMPONENT CHANGE OR ENGINE CHANGE IS THE SOLUTION TO THE CURRENT PROBLEM.