# SDR IPXA2024052827333

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 23, 2024
- Submitted: May 28, 2024
- Operation: Air carrier
- Aircraft: [N423UP](https://openairdocs.org/aircraft/N423UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 25325
- Aircraft time: 34,315 hours, 22,519 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Warning Message
- Condition: Illuminated
- Location: Cabin Pressure
- Stage of operation: CL
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2024052827333

## Discrepancy

**SUPPLEMENTAL SDR**  **ATB** AT TOP OF CLIMB, FL400, RECEIVED CABIN ALTITUDE WARNING, CABIN AUTO INOP. AIR TURN BACK TO SDF REPAIRED DUCT SENSOR MOUNTING BOSS IAW SREO-21276-REQ001.  REINSTALLED ORIGINAL DUCT.  OPS CHECK GOOD WITH REF TO MM 21-00-00-862-001.

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