Service difficulty report · Warning System · Boeing 737990ER

Difficulty date
November 18, 2017
Submitted
November 20, 2017
Operation
Air carrier
Aircraft
N433AS
Make and model
Boeing 737990ER
Aircraft serial
41704
Aircraft time
16,253 hours, 5,318 cycles
Part
Warning System
Condition
False Activation
Location
Cockpit
Stage of operation
AP
How discovered
O
Nature of condition
N
Precautionary procedure
O

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

What was found

ON SHORT FINAL "L" SIDE WINDOW OVERHEAT LIGHT CAME ON, TURNED OFF SWITCH AND LANDED. GROUNDED - YES. AFTER PERFORMING AMM 30-41-00-710-801, FIM 30-41 TASK 814 AND FIM 30-41 TASK 801, DETERMINED FAULT TO BE INTERMITTENT AFTER BEING UNSUCCESSFUL IN DUPLICATING THE FAULT. DUE TO THE MULTIPLE FAULTS RECORDED IN THE APPLICABLE WHCU, OPENED 2 C/B'S, DISCONNECTED THE WIRE FROM THE PRIMARY SENSORS "D" TERMINAL AND INSTALLED ON THE SPARE "D" TERMINAL PER FIM 30-41 TASK 811. PERFORMED OPS TEST PER AMM 30-41-11-710-801, GOOD. REMOVED MEL 30-11E.