# SDR IPMAS55030012121

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 21, 2021
- Submitted: January 22, 2021
- Operation: Air carrier
- Aircraft: [N509RP](https://openairdocs.org/aircraft/N509RP), registered now
- Make and model: Cessna S550
- Registry model: [Cessna S550](https://openairdocs.org/model/cessna-s550) (OpenAirDocs)
- Aircraft serial: S5500030
- Aircraft time: 9,227 hours, 7,602 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Coupling
- Part number: 6515315201
- Condition: Ruptured
- Location: Acm
- Part time: 9,227 hours, 9,227 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: S
- Precautionary procedure: B, G
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPMAS55030012121

## Discrepancy

DURING CLIMB A NOISE WAS HEARD FOLLOWED BY A CABIN DECOMPRESSION.  EMERGENCY DESCENT AND DECLARED EMERGENCY RETURNED AND LANDED WITHOUT FURTHER EVENT.  MAINTENANCE DISCOVERED OUTER DUCT TO ACM RUPTURED AND INNDER DUCT DISCONNECTED.

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