Service difficulty report · Sensor · Boeing 737990ER

Difficulty date
November 17, 2018
Submitted
November 19, 2018
Operation
Air carrier
Aircraft
N457AS
Make and model
Boeing 737990ER
Aircraft serial
36355
Aircraft time
19,123 hours, 6,339 cycles
Part
Sensor
Condition
Failed
Location
Window Heat
Part time
19,121 hours, 6,338 cycles
Stage of operation
NR
How discovered
O
Nature of condition
J
Precautionary procedure
O

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

What was found

FWD RIGHT WINDOW HEAT LT ILLUMINATED. RESET WOULD NOT CLEAR. GROUNDED - YES. PER B737-900 FIM 30-41 TASK 801/812 FWD RH WHCU BIT SHOWS SENSOR FAULT. CHANGED SENSOR SWITCH POSITION. BIT FAULTS SENSOR AGAIN. CHECKED SENSOR PINS AT WHCU, BOTH POSITIONS OF SENSORS CHECK OPEN. SENSORS CHECK OPEN AT WINDOW. WINDOW RESISTANCE TAPS CORRECT FOR NEW WINDOW PER B737-900 AMM 56-11-11. 71505. REMOVED AND REPLACED FWD RH #2 WINDOW REF AMM 56-11-11-000-801 AND AMM 56-11-11-400-801. PERFORMED WINDOW HEAT SYSTEM OPS TEST PER AMM 30-41-00, OPS CKS GOOD.