Service difficulty report · Control Unit · Boeing 737890

Difficulty date
November 5, 2008
Submitted
November 13, 2008
Operation
Air carrier
Aircraft
N559AS
Make and model
Boeing 737890
Aircraft serial
35178
Aircraft time
8,418 hours, 2,527 cycles
Part
Control Unit
Part number
8300005604
Part serial
8149D
Condition
Faulty
Location
Window Heat
Part time
8,418 hours, 2,527 cycles
Stage of operation
NR
How discovered
O
Nature of condition
J
Precautionary procedure
K

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

What was found

RIGHT SIDE WINDOW HEAT OVERHEAT LIGHT ILLUMINATED, TRIPPED MASTER CAUTION ANTI ICE. AMBER OVERHEAT LIGHT ILLUMINATED GREEN ON LIGHT EXTINGUISHED. RIGHT SIDE WINDOW WAS COOL TO THE TOUCH. LEFT SIDE WINDOW WAS WARM TO TOUCH (APPROX 8 000 FT ALG). TURNED RIGHT SIDE HEAT OFF FOR APPROX 2 MIN. TURNED SWITCH BACK ON OVERHEAT LIGHT ILLUMINATED AGAIN, APPROX 3 TO 4 MIN LATER. VERIFIED FAULT NR 2 WINDOW HEAT INOP, PERFORMED FIM 30 41 00 810 801 FOUND P5 CONTROL POWER FAULT. CKD VOLTAGE ALL NORMAL. RERACKED WHCU SYSTEM OPS NORMAL. FVR FLIGHT FOR RIGHT SIDE WINDOW HEAT PASSED.