Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date
November 12, 2023
Submitted
November 14, 2023
Operation
Air carrier
Aircraft
N409AS
Make and model
Boeing 737990ER
Aircraft serial
41733
Aircraft time
39,082 hours, 12,449 cycles
Part
Control Valve
Part number
3966081
Part serial
2366
Condition
Faulty
Location
Lh Ecs Bay
Part time
61,872 hours, 18,369 cycles
Stage of operation
NR
How discovered
O
Nature of condition
O
Precautionary procedure
K

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

What was found

NITROGEN GENERATION SYSTEM IS IN DEGRADED CONDITION. GROUNDED - YES. R/R LEFT FLOW CONTROL AND SHUTOFF VALVE IAW AMM TASK 21-51-01. OPS CHECK GOOD. NGS LIGHT SHOWS GREEN. NO LEAK. PACK/ZONE TEMP CONTROLLER FAULTS. SEAMC ANDY NOTIFIED. PLACARD REMOVED.