# SDR NACA2023011900001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 19, 2023
- Submitted: January 24, 2023
- Operation: Air carrier
- Aircraft: [N321CM](https://openairdocs.org/aircraft/N321CM), registered now
- Make and model: Boeing 767323
- Aircraft serial: 29431
- Aircraft time: 86,441 hours, 14,635 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Controller
- Part number: 79275515
- Part serial: 930353
- Condition: Failed
- Location: Priority Valve
- Part time: 3,047 hours, 714 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/NACA2023011900001

## Discrepancy

DUCT PRESSURE ENGINE BLEED SPLIT, LEFT WAS @ 20 PSI, AND RIGHT WAS @ 35 PSI IN CRUISE AT 34,000 FT. PERFORMED FIM 36-10 FAULT TREE 830, PERFORMED AIR SUPPLY BITE, FOUND PRVC FAULT. REMOVED AND REPLACED PRV CONTROLLER PER AMM 36-11-19, INSTALLATION TEST AND LEAK TESTS GOOD.

---
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.