Service difficulty report · Sensor · Boeing 737990ER

Difficulty date
May 27, 2022
Submitted
June 1, 2022
Operation
Air carrier
Aircraft
N453AS
Make and model
Boeing 737990ER
Aircraft serial
36354
Aircraft time
31,538 hours, 9,971 cycles
Part
Sensor
Part number
56100025
Part serial
15278H6901
Condition
Faulty
Location
Flight Deck
Part time
20,513 hours, 6,594 cycles
Stage of operation
NR
How discovered
V
Nature of condition
M
Precautionary procedure
K

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

What was found

LEFT SIDE WINDOW OVERHEAT ILLUMINATED. GROUNDED - YES. PERFORMED BITE OF LH SIDE WHCU M322 IAW B737-900 FIM 30-41 TASK 801. BITE PASSES, GREEN LED, BUT SHOWS WINDOW SENSOR ON EVERY LEG OF FAULT HISTORY. CHECKED WINDOW SENSOR RESISTANCE IAW B737-900 AMM 30-41-21-760-801, CHECKS GOOD, 306 OHMS. REF B737-900 WDM 30-41-12-2, CONNECTOR D10568 THROUGH COIL CORD ASSY, NO DEFECTS NOTED. DUE TO SENSOR ALREADY HAVING BEEN SWAPPED TO SPARE, AND DUE TO HISTORY, PERFORMED L2 WINDOW TAP WINDOW H16, MOVED TO TB5016-1 PER AMM TASK 30-41-21-000-801. REMOVED AND REPLACED CAPT NO. 2 SLIDING WINDOW PER AMM 56-12-11. OPERATIONAL AND AND FUNCTIONAL CHECKS GOOD.