# SDR P5CA2009062501601

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 25, 2009
- Submitted: June 25, 2009
- Operation: Air carrier
- Aircraft: [N416MC](https://openairdocs.org/aircraft/N416MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 32838
- Aircraft time: 33,108 hours, 5,176 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Acm
- Condition: Defective
- Location: Nr 1
- Stage of operation: CR
- 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/P5CA2009062501601

## Discrepancy

IN CRUISE A LOUD RUMBLING WAS HEARD THROUGH THE PACK SYSTEM AND AN ODOR WAS NOTICED COMING THROUGH THE VENTS.  CONDITIONAL INSPECTION WAS PERFORMED IAW MM 05-51-56 AND IT WAS CONFIRMED THERE IS A BAD PACK 1 ACM.  PACK 1 WAS DEACTIVATED AND DEFERRED IAW MEL 21-51-1.

---
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.