# SDR AALA202502071825

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 5, 2025
- Submitted: February 7, 2025
- Operation: Air carrier
- Aircraft: [N757AN](https://openairdocs.org/aircraft/N757AN), registered now
- Make and model: Boeing 777223
- Aircraft serial: 32636
- Aircraft time: 87,461 hours, 11,360 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Shutoff Valve
- Part number: 32153025
- Part serial: 5206
- Condition: Uncontrollable
- Location: Rt Engine
- Part time: 1,261 hours, 161 cycles
- 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/AALA202502071825

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: ON THE STATUS PAGE FAULT MESSAGE FOPR BLEED PRSOV, AFT CABIN TEMPS BEING TOO COLD AND UNCONTROLLABLE; AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT LHR. REPLACED RIGHT HAND ENGINE PRSOV - HIGH PRESSURE REGULATING AND SHUTOFF VALVE (AALA202502071825), PER AMM 36-11-09-400-801-001. ALSO REMOVE AND REPLACED RIGHT HAND PRSOV - HIGH PRESSURE REGULATING AND SHUTOFF VALVE CONTROLLER (AALA202502070597), PER AMM 36-11-18 PB 401. INSTALLATION TEST OK. NO LEAKS 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.