Service difficulty report · Autopilot Sys · Pilats PC1245

Difficulty date
June 4, 2015
Submitted
June 8, 2015
Operation
General aviation
Aircraft
N712BC
Make and model
Pilats PC1245
Aircraft serial
448
Aircraft time
4,027 hours, 4,461 cycles
Engine
Pwa PT6A67B
Engine time
4,027 hours, 4,461 cycles
Propeller
Hartzl HCE4A3D
Part
Autopilot Sys
Part number
065000860017
Part serial
X1855
Condition
Faulty
Location
Zone 200
Part time
2,230 hours, 2,267 cycles
Stage of operation
DE
How discovered
O
Nature of condition
B
Precautionary procedure
A

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

What was found

ON DESCENT, THE FLIGHT CREW REPORTED: AUTOPILOT DISCONNECTED IN FLIGHT FOLLOWED BY ELECTRICAL ODOR AND SMOKE IN COCKPIT". THE CREW DECLARED AN EMERGENCY, THE ACFT LANDED SAFELY WITHOUT INCIDENT. DURING TROUBLESHOOTING,THE AUTO PILOT MODE CONTROLLER WAS FOUND TO BE FAULTY AND THE SOURCE OF THE ELECTRICAL ODOR. THE MODE CONTROLLER/GLARESHIELD WIRING HARNESS WAS INSPECTED WITH NO DEFECTS FOUND. THE MODE CONTROLLER WAS DEFERRED IAW MEL 22-1 WHERE IT REPOSITIONED TO PSM FOR REPLACEMENT OF THE MODE CONTROLLER. MODE CONTROLLER, PN 065-00086-0017 WAS R & R IAW 12-A-22-10-05-00A-920A-A. OPS TESTED GOOD WITH NO FURTHER DEFECTS FOUND IAW 12-A-22-10-00-00A-903A-A.