- Difficulty date
- June 6, 2021
- Submitted
- June 9, 2021
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 44106
- Aircraft time
- 21,711 hours, 6,941 cycles
- Part
- Valve
- Condition
- Malfunctioned
- Location
- Cockpit Temp
- 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 INDICATION FLT DECK PRIMARY TEMP CONTROL INOP. GROUNDED - YES. VERIFIED FAULT, REMOVED & CLEANED & REINSTALLED. ALL 3 TEMP SENSOR FILTERS. ACCOMP PACK/ ZONE CONTLR BITE. #1 NO FAULTS #2 FAULTS FLT DECK TRIM VALVE. ACCOMP RESET. RE-ACCOMP BITE TEST, TEST PASS NO FAULTS. REF B737-900 AMM 21-61-06-400-801 & AMM 21-61-00-700-806-002.