# SDR UIEA2018091201952

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 12, 2018
- Submitted: September 13, 2018
- Operation: Air carrier
- Aircraft: [N640GT](https://openairdocs.org/aircraft/N640GT), registered now
- Make and model: Boeing 767-3S1
- Registry model: [Boeing 767-3S1](https://openairdocs.org/model/boeing-767-3s1) (OpenAirDocs)
- Aircraft serial: 25221
- Aircraft time: 86,766 hours, 18,434 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Relief Valve
- Part number: 80217012
- Part serial: 200206148
- Condition: Sticking
- Location: Bleed Air Sys
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2018091201952

## Discrepancy

LEFT ENGINE BLEED OFF INDICATION WHEN TURNING WING ANTI-ICE ON (DUCT PRESS 10 PSI). WHEN USING WING AND ENGINE ANTI-ICE ON DESCENT THE LEFT ENGINE BLEED OFF INDICATION ON EICAS. FOLLOW QRH AND RIGHT DUCT PRESS WAS NOT ENOUGH TO SUPPLY THE DEMAND FOR THE ANTI-ICE OPERATION. FOUND LT ENGINE PRV STICKING. REMOVED AND REPLACED PRV IAW AMM 36-11-18-004/404. OPS TEST GOOD.

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