# SDR ASAA2022020337350

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 3, 2022
- Submitted: February 8, 2022
- Operation: Air carrier
- Aircraft: [N453AS](https://openairdocs.org/aircraft/N453AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36354
- Aircraft time: 30,358 hours, 9,632 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- 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/ASAA2022020337350

## Discrepancy

ZONE TEMP CONT ZONE LIGHT IS ON WITH RECALL. GROUNDED - YES. PERFORMED PZTC BITE PER B737-900 FIM 21-62 TASK 801 #2 CONTROLLER FAULTED CONTROL CABIN TRIM AIR VALVE. PERFORMED FIM 21-62 TASK 832 INITIAL EVALUATION CONTROL CABIN FAULT RESET. OPERATED PACKS FOR 15 MINUTES AND FAULT DID NOT RETURN. REF B737-900 AMM 21-00-00-800-803. PACK IS OPERATING CORRECTLY.

---
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.