SDR 95ZZZM692

Service difficulty report · Tq Sensor Brg · Mtsbsi MU2B36

Difficulty date
October 4, 1995
Submitted
March 26, 2000
Operation
Air carrier
Aircraft
N305CW
Make and model
Mtsbsi MU2B36
Aircraft serial
667
Engine
Garrtt TPE3316252M
Part
Tq Sensor Brg
Part number
31010351
Condition
Failed
Location
Nr 2 Engine
Part time
5,347 hours
Component
Garrtt · 8968268
Stage of operation
CR
Nature of condition
X
Precautionary procedure
E, A

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

What was found

AT FL 150 IN LEVEL CRUISE CONDITIONS, THE NR 2 ENGINE FLAMED OUT. AN UNEVENTFUL LANDING WAS ACCOMPLISHED AT IPT . TROUBLESHOOTING OF THE ENGINE REVEALED THE MAIN OIL AND SCAVENGE PUMPS NOT ROTATING, THESE PUMPS ARE DRIVEN BY THE TORQUE SENSOR, THE MAIN FUEL PUMP AND FUEL CONTROL ARE DRIVEN BY THE OIL PUMPS. ENGINE TEAR DOWN REVEALED THAT THE TORQUE SENSOR BEARINGS P/N 3103035-1 FAILED ALLOWING SPUR GEAR, P/N 896805-1, TO COCK AND SHATTER, THERE BY UNCOUPLING THE DRIVE TO THE PUMPS. THIS ENGINE HAD A LIMITED GEAR BOX REPAIR ACCOMPLISHED 47 HOURS PRIOR. SUBMITTER STATES, SUGGEST REPLACEMENT OF THE 3103035-1 BEARINGS ANYTIME THE TORQUE SENSOR IS DISTURBED.