Service difficulty report · Modulating Valve · Boeing 737990ER

Difficulty date
January 15, 2023
Submitted
January 19, 2023
Operation
Air carrier
Aircraft
N448AS
Make and model
Boeing 737990ER
Aircraft serial
36356
Aircraft time
23,986 hours, 7,515 cycles
Part
Modulating Valve
Part number
3989085
Part serial
27637
Condition
Faulted
Location
Rt Acm
Part time
1,542 hours, 482 cycles
Stage of operation
TX
How discovered
O
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

RIGHT PACK LIGHT ILLUMINATED IN TAXI. EXTINGUISHES WITH MASTER RESET. GROUNDED - YES. REMOVED & REPLACED R. PACK TEMP CONTROL VALVE, REF B737-900 AMM 21-51-10.