Service difficulty report · Modulating Valve · Boeing 737990ER

Difficulty date
December 21, 2022
Submitted
December 28, 2022
Operation
Air carrier
Aircraft
N453AS
Make and model
Boeing 737990ER
Aircraft serial
36354
Aircraft time
33,680 hours, 10,610 cycles
Part
Modulating Valve
Part number
3989085
Part serial
20370
Condition
Failed
Location
Rt Acm
Part time
22,693 hours, 7,046 cycles
Stage of operation
CR
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

RT PACK LIGHT ON RECALL, LIGHT GOES OUT ON RESET (FL330). GROUNDED - YES. RIGHT PACK TCV FAILED DURING BITE. REMOVED & REPLACED RIGHT PACK TCV. REF B737-900 AMM 21-51-10-000-801 & 21-51-10-400-801.