Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date
January 4, 2018
Submitted
January 8, 2018
Operation
Air carrier
Aircraft
N467AS
Make and model
Boeing 737990ER
Aircraft serial
36362
Aircraft time
14,117 hours, 4,721 cycles
Part
Control Valve
Part number
3989085
Part serial
1454
Condition
Faulted
Location
Rt A/C Pack
Part time
77,166 hours, 41,300 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 ON RECALL AFTER START. ACFT GROUNDED. ACCOMPLISHED A RT PACK ZONE TEMP CONTROLLER BITE TEST, INDICATES TCV FAULT. TCV RESET. REMOVED & REPLACED THE TEMP CONTROL VALVE IAW AMM 21-51-10/401. LEAK CHECKED AND BITE CHECKED GOOD.