# SDR ASAA1058008

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 25, 2010
- Submitted: June 28, 2010
- Operation: Air carrier
- Aircraft: [N579AS](https://openairdocs.org/aircraft/N579AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35187
- Aircraft time: 12,554 hours, 3,736 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Condition: Malfunctioned
- Location: Ac Pack
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA1058008

## Discrepancy

AFTER PUSHBACK AND ENGINE START THE LEFT PACK LIGHT ILLUMINATED DURING MASTER CAUTION RECALL.  LIGHT EXTINGUISHED WHEN MASTER CAUTION RESET.  DUPLICATED LEFT PACK LIGHT ON RECALL.  BITE TEST NR 1 CONTROLLER SHOWED NR 1 TCV.  RESET FAULT.  LEFT PACK OPS NORMAL REF MM 21 00 00.  GROUND VERIFICATION SUCCESSFUL.

---
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.