Service difficulty report · Sensor · Boeing 747422

Difficulty date
March 31, 2011
Submitted
April 27, 2011
Operation
Air carrier
Aircraft
N174UA
Make and model
Boeing 747422
Aircraft serial
24381
Aircraft time
82,836 hours, 9,294 cycles
Engine
Pwa PW4056
Part
Sensor
Part number
S761S1028
Condition
Defective
Location
Cockpit Window
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

REPEAT WINDOW 2R HEAT FAULTS, MANEUVER WIRING AT S761 & S1028 ENSURE VOLTAGE READING DOES NOT FLUCT AND GND REMAINS STEADY. IF 115VAC NOT AT "B" CHK S1028 & S761 FOR OPEN. IF GND NOT AVAIL AT "A" SUSPECT R7338 DEFECTIVE. IF PWR & GND OK OPEN CB C69, DISC WIRING AT "A&B" ON WDO & CHK RESISTANCE OF WDO 2R PER FIM 30-40 FAULT TREE BOX 5. IF NO FAULT FOUND. REPLACE S761 & S1028. SEE HIST FOR PREV ACTIONS. COMPLETED ALL CHECKS AND MEASURMENTS ALL OK, REPLACED S761 AND S1028 OF WINDOW 2R.