# SDR ASAA2020110333482

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 3, 2020
- Submitted: November 10, 2020
- Operation: Air carrier
- Aircraft: [N537AS](https://openairdocs.org/aircraft/N537AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35204
- Aircraft time: 33,270 hours, 9,695 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [7320 · Fuel Controlling System](https://openairdocs.org/jasc/7320)
- Part: Fuel/Oil Cooler
- Part number: 453328039
- Part serial: YB041778
- Condition: Leaking
- Location: Nr 2 Engine
- Part time: 33,300 hours, 9,708 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: K
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020110333482

## Discrepancy

DURING WALKAROUND NOTED FUEL LEAKING FROM BOTTOM OF NR 2 ENGINE COWLING.  EVIDENCE OF LEAK NOTED BELOW THE NR 2 ENGINE.  GROUNDED-YES.   OPENED COWLING FOUND STATIC FUEL DRIPPING FROM MAIN OIL HEAT EXCHANGER PAD DRAIN 36 DPM NOTED.  LEAK WITHIN LIMITS, REF B737-800 AMM 71-71-00.  DEFERRED PLT FOR 25 FLIGHT CYCLES.  REMOVED AND REPLACED MAIN OIL FUEL HEAT EXCHANGER, REF AMM 79-21-02.

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