Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date
September 17, 2015
Submitted
September 21, 2015
Operation
Air carrier
Aircraft
N457AS
Make and model
Boeing 737990ER
Aircraft serial
36355
Aircraft time
6,354 hours, 2,063 cycles
Part
Control Valve
Part number
3989084
Part serial
20929
Condition
Failed
Location
A/C Bay
Part time
6,354 hours, 2,063 cycles
Stage of operation
CR
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

RAM DOOR FULL OPEN STAYED, LIGHT ON DURING ENTIRE FLIGHT. ACFT GROUNDED. PERFORMED LT RAM DOOR FULL OPEN LIGHT FIM 21-51, TASK 803. NO FAULTS FOUND. NO FAULTS LOGGED IN NR 1 & 2 PACK/ZONE TEMP CONTROLLERS. WHILE PERFORMING RT RAM DOOR FULL OPEN FIM TASK 21-51, TASK 803, FOUND RT PACK TCV CONTINUOUSLY RUNNING WITH VALVE INDICATOR IN CLOSED POSITION. VALVE MOTOR EXTREMELY HOT. REPLACED RT PACK TCV REF AMM 21-51-10. GROUND VERIFICATION TEST PASSED REF MM 21-51-10.