# SDR UIEA2022072600772

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 25, 2022
- Submitted: July 28, 2022
- Operation: Air carrier
- Aircraft: [N471MC](https://openairdocs.org/aircraft/N471MC), registered now
- Make and model: Boeing 747412
- Aircraft serial: 26557
- Aircraft time: 86,764 hours
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Isolation Valve
- Part number: 39831051
- Part serial: 4860
- Condition: Faulty
- Stage of operation: CL
- How discovered: O
- Nature of condition: O, S
- Precautionary procedure: A, J
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2022072600772

## Discrepancy

AFTER TAKEOFF, BOTH DUCTS INDICATED BETWEEN 7 AND 17 PSI(PERFORMED FIM TASK 36-11 TASK 826. FOUND RIGHT ISOLATION VALVE FAULTY. REMOVED AND REPLACED RIGHT ISOLATION VALVE IAW AMM 36-11-07-404 AND PERFORMED LEAK CHECK. OPS CHECK & LEAK CHECK GOOD.</P>)

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