# SDR P5CA0801552

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 26, 2008
- Submitted: April 4, 2008
- Operation: Air carrier
- Aircraft: [N452PA](https://openairdocs.org/aircraft/N452PA), registered now
- Make and model: Boeing 747-46NF
- Registry model: [Boeing 747-46NF](https://openairdocs.org/model/boeing-747-46nf) (OpenAirDocs)
- Aircraft serial: 30810
- Aircraft time: 31,680 hours, 5,338 cycles
- System (JASC): [3600 · Pneumatic System](https://openairdocs.org/jasc/3600)
- Part: Relief Valve
- Part number: 80217010
- Part serial: 9910064
- Condition: Wrong Part
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/P5CA0801552

## Discrepancy

RETURN TO BLOCKS DUE TO "BLD 1 OVHT/PRV" EICAS MESSAGE.  FINDING THAT THE INCORRECT PRV VALVE WAS DELIVERED, MAINTENANCE SWAPPED THE NR 3 HPSOV WITH NR 1 PRV AND THEN DEFERRED THE NR 3 HPSOV, PER MM 36-11-00.

---
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.