Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date
August 2, 2022
Submitted
August 12, 2022
Operation
Air carrier
Aircraft
N491AS
Make and model
Boeing 737990ER
Aircraft serial
44109
Aircraft time
24,927 hours, 7,865 cycles
Part
Control Valve
Part number
3966081
Part serial
9005
Condition
Faulty
Location
Left Ecs Bay
Part time
25,035 hours, 7,898 cycles
Stage of operation
NR
How discovered
V
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

NGS BLUE LIGHT. GROUNDED - YES. REMOVED AND REPLACED L/H PACK FLOW CONTROL AND SHUTOFF VALVE REF B737-900 AMM 21-51-01.