Service difficulty report · Thermostat · Boeing 747422

Difficulty date
October 29, 2012
Submitted
November 21, 2012
Operation
Air carrier
Aircraft
N121UA
Make and model
Boeing 747422
Aircraft serial
29167
Aircraft time
56,764 hours, 6,638 cycles
Engine
Pwa PW4056
Part
Thermostat
Condition
Unsecure
Location
Window Heat
Stage of operation
NR
How discovered
O
Nature of condition
O
Precautionary procedure
O

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

What was found

COCKPIT WINDOW 2R FREEZING OVER. HEAT ELEMENT IS BROKEN AND NOT ATTACHED. FOUND CONTROL THERMOSTAT DETACHED FROM RETAINER SPRING. SECURED THERMOSTAT ON POSITION AND ACP'D WINDOW HEAT TEST PER MM. NO FAULT FOUND. ALSO ACP'D 2R WINDOW INSPECTION PER MM. NO FAULT FOUND.