Service difficulty report · Sensor · Boeing 737990ER

Difficulty date
June 9, 2018
Submitted
June 11, 2018
Operation
Air carrier
Aircraft
N474AS
Make and model
Boeing 737990ER
Aircraft serial
40715
Aircraft time
11,865 hours, 3,944 cycles
Part
Sensor
Condition
False Indication
Location
Window
Stage of operation
NR
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

RIGHT SIDE WINDOW OVERHEAT LIGHT ILLUMINATED, RAN CHECKLIST WAITED FOR 5 MINUTES TO TURN SWITCH BACK ON AND LIGHT ILLUMINATED AGAIN. ACFT GROUNDED. ACCOMPLISHED WINDOW HEAT CONTROL UNIT BITE PROCEDURE IAW FIM 30-41, TASK 801, BITE SHOWS F/O SLIDING WINDOW SENSOR FAULT. ACCOMPLISHED FIM 30-41, TASK 811. WINDOW SENSOR FAULT LIGHT ISOLATION. PRIMARY SENSOR READS 305 OHM. DISCONNECTED PRIMARY SENSOR UPPER D-TERMINAL WIRE & CONNECTED THE SPARE SENSOR (320 OHM) LWR D-TERMINAL, OPS CHECKED NORMAL.