# SDR 99ZZZX535

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 13, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N9923S
- Make and model: Doug DC3C
- Registry model: [Doug DC3C](https://openairdocs.org/model/douglas-dc3c) (OpenAirDocs)
- Aircraft serial: 25964
- System (JASC): [7921 · Engine Oil Cooler](https://openairdocs.org/jasc/7921)
- Part: Oil Cooler
- Part number: U16011
- Condition: Leaking
- Location: Nr 2
- Stage of operation: IN
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX535

## Discrepancy

OIL COOLER DEVELOPED LEAK IN CORE AT ONE END OF A COOLING TUBE.  SUBMITTER STATED POSSIBLY CAUSED BY HIGH OIL PRESSURE ON START-UP WITH COLD OIL.

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