Service difficulty report · Bushing · Gulstm 690A

Difficulty date
September 12, 2011
Submitted
September 16, 2011
Operation
General aviation
Aircraft
N690SD
Make and model
Gulstm 690A
Aircraft serial
11287
Part
Bushing
Part number
31035921
Condition
Unserviceable
Location
Torque Sensor
Part time
4,571 hours
Stage of operation
IN
How discovered
V
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

BUSHING, PN 31035921, SEPARATED FROM THE TORQUE SENSOR MAIN HOUSING PN 3103583-2 ALLOWING THE INTERMEDIATE BEARING AND DRIVE GEAR ASSY TO SHIFT FWD IN THE HSG. SPUR GEAR PN 3103406-2 CONTACTED THE MAIN HOUSING. SPUR GEAR, PN 3103406-2 CONTACTED THE MAIN HOUSING DUE TO THE SHIFT AND SUBSEQUENTLY FAILED, 2 GEAR TEETH BROKEN FREE FROM THE GEAR AND BECAME JAMMED IN THE MAIN DRIVE GEAR, PN 896884-1, CAUSING THE GEAR TO FRACTURE AND SEPARATE FROM THE DRIVE SHAFT. THIS SEPARATION CAUSED THE FUEL CONTROL DRIVE TRAIN TO "UNCOUPLE" AND THE ENGINE TO SHUTDOWN DUE TO LOSS OF DRIVE TO THE ENGINE DRIVEN FUEL PUMP.