# SDR ASAA2021040634523

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 6, 2021
- Submitted: April 8, 2021
- Operation: Air carrier
- Aircraft: [N469AS](https://openairdocs.org/aircraft/N469AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41702
- Aircraft time: 25,208 hours, 8,149 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Controller
- Condition: Malfunctioned
- Location: Cockpit Temp
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021040634523

## Discrepancy

CONT CAB ZONE TEMP LIGHT ON RECALL RESETS W/MC. GROUNDED - YES. A/C REL PER MEL 21-21G PRIMARY CONT CAB ZONE TEMP INOP. ACCOMP BITE CK OF #2 ZONE CONT PER B737-900 21-61-00. LOGGED FLT DECK TRIM VALVE. FAULT CLEARED & OPS CKS NML. THIS CLEARS MEL 21-21G, FLT CREW PLACARD REMOVED. GROUND VERIFICATION SUCCESSFUL. SEAMC CARLOS NOTIFIED.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.