Service difficulty report · Modulating Valve · Boeing 737990ER
FAA SDR system
- Difficulty date
- November 8, 2023
- Submitted
- November 9, 2023
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 36354
- Aircraft time
- 36,641 hours, 11,551 cycles
- Part
- Modulating Valve
- Part number
- 3989085
- Part serial
- 20271
- Condition
- Faulty
- Location
- Lh Ecs Bay
- Part time
- 30,132 hours, 10,556 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
CONT CAB ZONE TEMP LIGHT ILLUMINATED UPON RECALL IT DOES RE-SET. GROUNDED - YES. (RESOLVED ON W/O: 1976139 TASKCARD: N/R-00004 ) CONFIRMED FAULT, #2 PACK/ZONE TEMP CONTROLLER SHOWS HARD FAIL "FLIGHT DECK TCV" FAULT. REMOVED & REPLACED V143 TCV REF AMM 21-61-21, GROUND FUNCTIONAL CK NML REF AMM 21-61-00-700-806-002. PULLED & RESET 1 TOTAL C/B. AIRCRAFT RELEASED FROM MEL 21-21G, C/N 08035453. SEAMC NOTIFIED "ASHRAF." REVERSAL OF CONFIGURATION CHANGES NOT REQUIRED.