Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date
September 5, 2018
Submitted
September 7, 2018
Operation
Air carrier
Aircraft
N481AS
Make and model
Boeing 737990ER
Aircraft serial
44106
Aircraft time
12,428 hours, 4,188 cycles
Part
Control Valve
Part number
3966081
Part serial
8778
Condition
Stuck
Location
Ac Bay
Part time
12,428 hours, 4,188 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

NR 2 ENG N1 TARGET DOES NOT CHANGE WITH RT PACK SWITCH POSTION. GROUNDED - YES. FOUND RIGHT PACK FLOW CONTROL AND SHUTOFF VALVE V19 NOT FULLY CLOSED. REMOVED & REPLACED RT FLOW CTRL & SHUTOFF VALVE REF AMM 21-51-01. LEAK & OPS CHECK GOOD. NR 2 ENG N1 TARGET NORMAL.