Service difficulty report · Overheat Sensor · Swrngn SA227AC

Difficulty date
January 3, 2008
Submitted
January 3, 2008
Operation
Air carrier
Aircraft
N159MC
Make and model
Swrngn SA227AC
Aircraft serial
AC728B
Aircraft time
29,265 hours, 40,661 cycles
Engine
Garrtt TPE3311U
Part
Overheat Sensor
Part number
434422122
Condition
Defective
Location
Lt Nacelle
Stage of operation
CL
How discovered
O
Nature of condition
N
Precautionary procedure
E, A

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

What was found

WHILE ON CLIMB OUT, THE PILOT NOTICED THAT THE LT WING OVERHEAT LIGHT ILLUMINATED. FOLLOWING PROCEDURE, THE LT GENERATOR WAS SHUTDOWN, BLEED AIR TURNED OFF AND THE LANDING GEAR EXTENDED. AFTER 3 MINUTES THE LIGHT WAS STILL ILLUMINATED AND PROCEDURES CALL OUT FOR ENGINE SHUTDOWN. SHORTLY AFTER ENGINE SHUTDOWN THE LIGHT EXTINGUISHED. THE PILOT INFORMED THE TOWER OF HIS SITUATION AND WAS CLEARED TO RETURN TO DEPARTURE WHERE HE MADE AN UNEVENTFUL LANDING. UPON INVESTIGATION, NO EVIDENCE OF FIRE OR OVERHEATING COULD BE FOUND IN THE WING AND GEAR WELL AREAS. IT IS SUSPECTED THAT DUE TO HIGH WINDS DURING THE PILOT’S BACK TAXI TO THE ACTIVE RUNWAY, HE MAY HAVE HAD TO APPLY CONSTANT BRAKE PRESSURE TO KEEP HIS TAXI SPEED LOW. THIS WOULD HAVE CAUSED EXCESSIVE HEATING OF THE BRAKE ASSEMBLY AND ONCE THE GEAR WAS RETRACTED, CAUSED THE WING OVERHEAT LIGHT TO COME ON. IT WAS ALSO REPORTED THAT THE CABIN HEAT WAS SELECTED TO THE FULL HOT POSITION, WHICH MAY HAVE ALSO BEEN A FACTOR.