# SDR ASAA2023091345106

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 13, 2023
- Submitted: September 14, 2023
- Operation: Air carrier
- Aircraft: [N407AS](https://openairdocs.org/aircraft/N407AS), registered now
- Make and model: Boeing 737-900ER
- Registry model: [Boeing 737-900ER](https://openairdocs.org/model/boeing-737-900er) (OpenAirDocs)
- Aircraft serial: 41731
- Aircraft time: 40,869 hours, 12,758 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023091345106

## Discrepancy

LEFT PACK LIGHT ILLUMINATED AFTER BLOCKOUT ( ON THE GROUND) AND PRIOR TO THE PACK SWITCH MOVED TO ON. RUN PACK ( TURNED ON ) AND ACCOMPLISHED QRH CHECKLIST, PACK LIGHT STILL ILUMINATED. RETURNED TO GATE FOR MAINTENANCE ACTION. GROUNDED - YES. PERFORMED PZTC BITE FOUND LEFT CONT "TCV THID PACK" FAULT.VERIFY PASSED IAW FIM 21-63 TASK 802.A/C OK FOR SERVICE. NO HISTORY 30 DAYS.SEAMC PAT NOTIFIED, GROUND VERIFICATION SECCESSFUL.

---
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.