# SDR NACA2025073100003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 31, 2025
- Submitted: September 26, 2025
- Operation: Air carrier
- Aircraft: [N566NC](https://openairdocs.org/aircraft/N566NC), registered now
- Make and model: Boeing 767-3BG
- Registry model: [Boeing 767-3BG](https://openairdocs.org/model/boeing-767-3bg) (OpenAirDocs)
- Aircraft serial: 30566
- Aircraft time: 78,361 hours, 20,248 cycles
- Engine: Pwa PW4060
- System (JASC): [7261 · Turbine Engine Oil System](https://openairdocs.org/jasc/7261)
- Part: Valve
- Condition: Leaking
- Location: Eng Oil
- Stage of operation: IN
- How discovered: V
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/NACA2025073100003

## Discrepancy

DURING WALK AROUND FOUND LH ENGINE HAS OIL LEAK. FOUND LH ENG AIR/OIL HEAT EXCHANGER VALVE RETURN TUBE LEAKING OIL . TIGHTENED A/O HEAT EXCHANGER VALVE RETURN B-NUT PER AMM 79-21-09

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