# SDR DXTA2024070312250

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 3, 2024
- Submitted: July 3, 2024
- Operation: Air carrier
- Aircraft: N378QS
- Make and model: Cessna 680CE
- Aircraft serial: 6800103
- Aircraft time: 13,858 hours, 9,307 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Duct
- Part number: 69150308
- Condition: Blown
- Location: Pneumatic System
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2024070312250

## Discrepancy

AT 39,000 FEET WHILE IN CRUISE WE HEARD A LOUD BANG. AT THAT TIME, CABIN ALTITUDE BEGAN RISING 750' PER MINUTE. WE WERE AT AROUND 9.0 PSI DIFFERENTIAL AROUND 6000 FEET CABIN ALT. WITHIN MINUTES WE KEPT CLIMBING TO 14000'  CABIN ALTITUDE.  EMERGENCY DESCENT AND DIVERSION RESULTED FROM THIS ISSUE.  THE AMBER AND RED  CABIN PRESSURIZATION CAS MSGS WERE DISPLAYED.  COMPLIED WITH DETAIL INSPECTION OF BOTH LH AND RH SIDE DUCTS. FOUND RH DUCT TO BE BUSTED. REMOVED RH C0NDID0NED AIR DUCT AND INSTALLED CUSTOMER PROVIDED NEW AIR DUCT PER AMM 21-22-05. OPS AND LEAK CHECK GOOD AT THIS TIME

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