# SDR DALA2020120703996

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 6, 2020
- Submitted: December 7, 2020
- Operation: Air carrier
- Aircraft: [N697DL](https://openairdocs.org/aircraft/N697DL), registered now
- Make and model: Boeing 757232
- Aircraft serial: 30318
- Aircraft time: 70,118 hours, 26,671 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Coupling
- Condition: Broken
- Location: Shutoff Valve
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2020120703996

## Discrepancy

THE AIRCRAFT WAS DIVERTED TO MEM DUE TO A "CABIN ALTITUDE" WARNING LIGHT AT FL400, WITH ONLY A LT PACK EICAS MESSAGE.  THE CREW DID ACCOMPLISH AN EMERGENCY DESCENT.  CORRECTIVE ACTION: MAINTENANCE REPLACED THE LT PRSOV CONTROLLER & PRSOV AND A BROKEN LEADING EDGE DUCT COUPLING.  PERFORMED ENGINE BLEED, SINGLE PACK CONFIDENCE & EXCESSIVE LEAK DOWN CHECKS.  OK FOR SERVICE.

---
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.