# SDR HNAA2010063000158

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 6, 2010
- Submitted: June 30, 2010
- Operation: Air carrier
- Aircraft: N906HA
- Make and model: Dhav DHC8102
- Aircraft serial: 009
- Aircraft time: 64,229 hours, 72,651 cycles
- Engine: Pwa PW120A
- System (JASC): [7261 · Turbine Engine Oil System](https://openairdocs.org/jasc/7261)
- Part: Oil Cooler
- Condition: Leaking
- Location: Nr 1 Engine
- Stage of operation: CR
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HNAA2010063000158

## Discrepancy

IN FLIGHT, NR 1 ENGINE OIL PRESSURE DROPPED TO 40PSI FOR 3 MINUTES. SHUT NR1 ENGINE DOWN IAW CHECK LIST, LANDED NORMALLY WITH 1 ENGINE.  INVESTIGATED, FOUND HELICOIL BACKING OUT ON INPUT SIDE OF THE OIL COOLER. FOUND O-RING ON OUTPUT SIDE SLICED. R & R OIL COOLER AND O-RINGS IAW MM 79-20-11, OPS AND LEAKED CHECKED GOOD.

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