Service difficulty report · Valve · Boeing 737990ER

Difficulty date
October 10, 2020
Submitted
October 12, 2020
Operation
Air carrier
Aircraft
N464AS
Make and model
Boeing 737990ER
Aircraft serial
40714
Aircraft time
25,033 hours, 7,884 cycles
Part
Valve
Part number
3989085
Part serial
11542
Condition
Intermittent
Location
Right Ecs Bay
Part time
43,168 hours, 13,491 cycles
Stage of operation
NR
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 ILLUMINATES ON RECALL, EXTINGUISHES WITH RESET. GROUNDED-YES. PERFORMED PACK TEMP CONTROLLER BITE TEST, REF B737-900 FIM 21-62 TASK 801. FOUND RIGHT PACK TCV FAULTED ON BIT AND PREVIOUS FLIGHT TESTS, FAULT RECOVERED ON VERIFY. REMOVED AND REPLACED RIGHT PACK TCV AS PRECAUTIONARY, REF B737-900 AMM 21-51-10/401. OPERATIONS CHECK GOOD. LEAK CHECK GOOD. GROUND VERIFICATION SUCCESSFUL.