# SDR AALA202607243503

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 21, 2026
- Submitted: July 24, 2026
- Operation: Air carrier
- Aircraft: [N784AN](https://openairdocs.org/aircraft/N784AN), registered now
- Make and model: Boeing 777223
- Aircraft serial: 29588
- Aircraft time: 100,861 hours, 12,510 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Relief Valve
- Condition: Deactivated
- Location: Zone 100
- Stage of operation: CL
- 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/AALA202607243503

## Discrepancy

AIRCRAFT WAS GROUNDED: DURING CLIMBOUT THE EICAS DISPLAYED "BLEED LOSS WING R" AND "PAC K R" MSG. STATUS PAGE DISPLAYED "BLEED PRSOV R" AND "BLEED HPSOV R" MSG. RIGHT DUCT PRESSURE INDICATED 8 PSI. DECESION MADE TO DIVERT TO BOS , EMERGENCY DECLARED AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REACTIVATED PRSOV VALVE IAW AMM 36-00-00-440-801. ACCOMPLISHED DEACTIVATION OF HPSOV IAW AMM 36-00-00-040-802. SEE MIC 8702727 FOR OPS CKS.

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