- Difficulty date
- April 10, 2022
- Submitted
- April 13, 2022
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 44106
- Aircraft time
- 24,822 hours, 7,828 cycles
- Part
- Valve
- Part number
- 3989085
- Part serial
- 7765
- Condition
- Failed
- Location
- Left Ecs Bay
- Part time
- 51 hours, 15 cycles
- Stage of operation
- NR
- How discovered
- V
- Nature of condition
- J
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP ILLUMINATED ON MASTER CAUTION RECALL. GROUNDED - YES. PERFORMED PACK PZTC BITE PROCEDURE REF B737-900 FIM 21-62 TASK 801. FOUND BOTH PZTC 1&2 FLAGS FLIGHT DECK TRIM VALVE HARD FAILED (FIM 21-62 TASK 833). REMOVED AND REPLACED LH PACK TAV V143 REF B737-900 AMM 21-61-21, OPS CHECK GOOD. BITE AND RESET FAULT SUCCESSFUL, NO LEAKS NOTED.