# SDR DXTA2026091009622

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 8, 2026
- Submitted: September 10, 2026
- Operation: Air carrier
- Aircraft: [N447QS](https://openairdocs.org/aircraft/N447QS), registered now
- Make and model: Emb EMB-505
- Registry model: [EMB EMB-505](https://openairdocs.org/model/embraer-executive-emb-505) (OpenAirDocs)
- Aircraft serial: 50500635
- Aircraft time: 4,904 hours, 3,843 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Pressure Valve
- Part number: 1039182
- Part serial: 10391800780
- Condition: Faulted
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2026091009622

## Discrepancy

CABIN ALTITUDE HI CAS WARNING MESSAGE ILLUMINATED WHILE LEVELING AT 430. CABIN DID NOT SEEM TO GO ABOVE 10000FT AND PAX MASKS DID NOT DROP. ONCE AT 10000FT AIRCRAFT PRESSURIZATION DIFFERENTIAL SEEMED TO BE NOT NORMAL ALL THE WAY DOWN TO SEA LEVEL AND LANDING.  TROUBLESHOT TO FAULTY PRESSURE RELIEF VALVE ( SEE STEPS FOR TROUBLESHOOTING.) REMOVED AND INSTALLED WITH A NEW PRESSURE RELIEF VALVE IAW AMM 21-31-04 . OPS CHECK AND LEAK CHECK GOOD. NO FURTHER DEFECTS NOTED.

---
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.