# SDR DALA2026041702451

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 15, 2026
- Submitted: April 17, 2026
- Operation: Air carrier
- Aircraft: [N178DN](https://openairdocs.org/aircraft/N178DN), registered now
- Make and model: Boeing 767332
- Aircraft serial: 25143
- Aircraft time: 145,927 hours, 21,567 cycles
- Engine: Pwa PW4060
- Engine time: 119,571 hours, 19,044 cycles
- System (JASC): [7921 · Engine Oil Cooler](https://openairdocs.org/jasc/7921)
- Part: Heat Exchanger
- Condition: Leaking
- Location: Engine Oil
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2026041702451

## Discrepancy

DIVERTED TO HND FOR LEFT ENGINE OIL QUANTITY DECREASED TO ZERO WITH STABLE TEMPERATURE AND PRESSURE. RIGHT ENGINE ALSO HAD OIL QUANTITY DECREASING WITH STABLE TEMPERATURE AND PRESSURE.   REPLACED BOTH LEFT AND RIGHT ENGINE AIR OIL HEAT EXCHANGER FOR LEAKING.(8439433) (AIRCRAFT GROUNDED)

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