# SDR ASAA2022111940844

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 19, 2022
- Submitted: November 21, 2022
- Operation: Air carrier
- Aircraft: [N423AS](https://openairdocs.org/aircraft/N423AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 35206
- Aircraft time: 34,741 hours, 11,041 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: A/C Pack
- Part number: UNKNOWN
- Condition: Warning Light
- 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/ASAA2022111940844

## Discrepancy

LEFT PACK LIGHT ILLUMINATED. RAN QRH, RESETS WITH MASTER CAUTION RESET. GROUNDED - YES. BITE OF LEFT PACK TEMP CONTROLLER SHOWS TCV FAULT LAST LEG. BITE OF CONTROLLER OPS NORMAL AND FAULT CLEARS REF B737-900 AMM 21-61-20-400-801.

---
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.