# SDR SROM200700001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 5, 2007
- Submitted: January 7, 2007
- Operation: General aviation
- Aircraft: [N245US](https://openairdocs.org/aircraft/N245US), registered now
- Make and model: Boeing 737201
- Aircraft serial: 22751
- Aircraft time: 53,834 hours, 46,538 cycles
- Engine: Pwa JT8D15
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Duct
- Part number: 65544709
- Condition: Ruptured
- Location: A/C Pack
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SROM200700001

## Discrepancy

UPON TAKEOFF A POP WAS WAS HEARD FOLLOWED BY PERCEIVED SMOKE (DUST) IN THE CABIN.  PACS WERE SELECTED TO OFF AND A IMMEDIATE LANDING MADE AT THE DEPARTURE AIRPORT.  ALL COCKPIT INDICATIONS NORMAL.  FOUND LT AIR CONDITIONING PAC MIXING CHAMBER AND HOT AIR SUPPLY DUCT SEPARATED/ DAMAGED ALLOWING HOT CONDITIONED AIR TO ENTER CABIN THROUGH RETURN GRILLS, THUS CREATING DUST.  APPEARS TO HAVE EXPERIENCED INTERNAL DAMAGE RESULTING IN BACK PRESSURE WHICH CAUSED THE DUCT/FLANGE FAILURE.  NO OTHER DAMAGE NOTED.  REPLACED MIXING AND HOT AIR DUCTS.

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