# SDR ASAA2020080532992

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 5, 2020
- Submitted: August 10, 2020
- Operation: Air carrier
- Aircraft: [N531AS](https://openairdocs.org/aircraft/N531AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35199
- Aircraft time: 38,386 hours, 11,185 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [7311 · Engine Fuel/Oil Cooler](https://openairdocs.org/jasc/7311)
- Part: Heat Exchanger
- Part number: 453328039
- Part serial: YB040232
- Condition: Leaking
- Location: Nr 1 Engine
- Part time: 37,622 hours, 11,154 cycles
- Stage of operation: IN
- How discovered: O
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020080532992

## Discrepancy

DURING #1 ENGINE START, NOTICED FUEL LEAKING FROM THE MAIN FUEL/OIL HEAT EXCHANGER. THE LEAKAGE RATE WAS A STEADY STREAM DURING INITIAL ENGINE START. AFTER ENGINE START IT WAS 5 DROPS A MINUTE. AFTER 5 MINUTES IDLE RUN ALL LEAKAGE STOPPED. GROUNDED - YES. REMOVED AND REPLACED #1 ENG MAIN OIL/FUEL HEAT EXCHANGER REF B737-800 AMM 79-21-02-000-801-F00 & AMM 79-21-02-400-801-F00. 5 MIN IDLE LK CK'D GOOD. NO LK'S NOTED.

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