Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date
August 16, 2018
Submitted
August 20, 2018
Operation
Air carrier
Aircraft
N402AS
Make and model
Boeing 737990ER
Aircraft serial
41189
Aircraft time
22,940 hours, 7,562 cycles
Part
Control Valve
Part number
3989083
Part serial
10046
Condition
Faulted
Location
Rt A/C Pack
Part time
41,464 hours, 12,365 cycles
Stage of operation
NR
How discovered
9
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 A/C PACK LIGHT ILLUMINATED ON MC RECALL & EXTINGUISHES ON MC RESET. ACFT GROUNDED. ACCOMPLISHED PACK ZONE TEMP CONT BITE IAW AMM 21-61-00-700-806-002. PREV HISTORY SHOWS RIGHT PACK TCV FAULT. FAULT CLEARED ON VERIFICATION. REMOVED & REPLACED THE RIGHT PACK TCV IAW AMM 21-51-10-400-801. LEAK CHECKED GOOD . PACK ZONE TEMP CONT BITE SHOWS NO FAULTS.