# SDR DXTA2010110204285

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 1, 2010
- Submitted: November 2, 2010
- Operation: Air carrier
- Aircraft: [N920QS](https://openairdocs.org/aircraft/N920QS), registered now
- Make and model: Cessna 750
- Registry model: [Cessna 750](https://openairdocs.org/model/cessna-750) (OpenAirDocs)
- Aircraft serial: 7500120
- Aircraft time: 9,920 hours, 6,039 cycles
- Engine: Rroyce AE3007C1
- System (JASC): [2161 · Cabin Temperature Controller](https://openairdocs.org/jasc/2161)
- Part: Acm
- Condition: Failed
- Location: Cockpit
- Stage of operation: DE
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2010110204285

## Discrepancy

ON INITIAL DESCENT, CREW & PAX NOTICED STRONG, PUNGENT ODOR (LIKE A STRUCK MATCH).  ON REACHING A LOWER ALTITUDE, ISOLATED EACH PACK AND FOUND THE COCKPIT PACK TEMPERATURE TO BE UNCONTROLABLE IN AUTO & MANUAL.  REMOVED AND INSTALLED COCKPIT ACM IAW MM 21-51-00.  OPS CHECKED GOOD.

---
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.