Service difficulty report · Control Unit · Boeing 737990ER

Difficulty date
October 21, 2021
Submitted
October 26, 2021
Operation
Air carrier
Aircraft
N464AS
Make and model
Boeing 737990ER
Aircraft serial
40714
Aircraft time
28,589 hours, 8,969 cycles
Part
Control Unit
Part number
8300005604
Part serial
9737D
Condition
Faulty
Location
Ee Rack, E4
Part time
52,258 hours, 15,533 cycles
Stage of operation
DE
How discovered
V
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

ON DESCENT @ 10000 FT THE LEFT SIDE OVERHEAT AMBER LIGHT ILLUMINATED. FOLLOWED QRH AND TURNED POWER SWITCH OFF FOR 5 MINUTES, THEN BACK ON THE OVERHEAT LIGHT ILLUMINATED AGAIN AFTER 5 MINUTES. GROUNDED - YES. DUE TO PREVIOUS HISTORY REMOVED AND REPLACED LEFT SIDE (M322) WHCU PER B737-900 AMM 30-41-11/401 OPS CHECK GOOD, NO FAULTS NOTED AT THIS TIME. THIS CLEARS MEL 30-11E, PLACARD, AND CN REMOVED SEAMC WILL NOTIFIED.