# SDR HVUA202605120811

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 28, 2026
- Submitted: May 12, 2026
- Operation: Air carrier
- Aircraft: [N641AT](https://openairdocs.org/aircraft/N641AT), registered now
- Make and model: Pilats PC1247
- Aircraft serial: 767
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 1037843
- Part serial: 86C0085
- Condition: Fod
- Location: Zone 100
- Part time: 13,788 hours
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: G, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HVUA202605120811

## Discrepancy

NEARING TOP OF CLIMB THE CABIN CONTINUED A SHALLOW CLIMB PAST THE SCHEDULED CABIN ALTITUDE. IN RESPONSE THE PILOT DONNED HIS OXYGEN MASK AND INSTRUCTED PASSENGERS TO DO THE SAME WHILE HE EXECUTED A NORMAL DESCENT. AN EMERGENCY DESCENT WAS NOT PERFORMED. THE MAXIMUM CABIN ALTITUDE REACHED 14,000 FEET WITH AIRCRAFT AT FL 220. THE DESCENT AND RETURN WAS NORMAL WITH NO FURTHER INCIDENT. AFTER LANDING NEITHER PILOT NOR ANY PASSENGERS REPORTED ANY PHYSIOLOGICAL ISSUES.

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