# SDR ASAA2017100622143

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 6, 2017
- Submitted: October 9, 2017
- Operation: Air carrier
- Aircraft: [N508AS](https://openairdocs.org/aircraft/N508AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35691
- Aircraft time: 35,239 hours, 10,608 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [7311 · Engine Fuel/Oil Cooler](https://openairdocs.org/jasc/7311)
- Part: Heat Exchanger
- Part number: 118411934
- Part serial: YB030278
- Condition: Leaking
- Location: Nr 1 Fuel-Oil
- Part time: 34,929 hours, 10,524 cycles
- 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/ASAA2017100622143

## Discrepancy

THE NR 1 ENGINE FUEL - OIL HEAT EXCHANGER HAS A RUNNING LEAK FROM MOUNTING BASE GASKET.   ACFT GROUNDED.  REMOVED AND REPLACED THE NR 1 ENGINE FUEL - OIL HEAT EXCHANGER IAW AMM 79-21-02-000-801-F00, AND 79-21-02-400-801-F00. ACCOMPLISHED TESTS LISTED IN THE POWERPLANT TEST REF TABLE TEST 3A. LEAK CHECKED GOOD.

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