# SDR ASAA2020102433406

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 24, 2020
- Submitted: October 26, 2020
- Operation: Air carrier
- Aircraft: [N579AS](https://openairdocs.org/aircraft/N579AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35187
- Aircraft time: 49,957 hours, 14,813 cycles
- System (JASC): [2822 · Fuel Boost Pump](https://openairdocs.org/jasc/2822)
- Part: Pump
- Part number: 607551005
- Part serial: 020736178
- Condition: Noisy
- Location: Fuel Boost
- Part time: 49,963 hours, 14,814 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020102433406

## Discrepancy

NR 1 FWD FUEL PUMP LOW PRESSURE LIGHT BLINKING.  GROUNDED-YES.  DISCONNECTED D72 AND RESET C/B P91 D1.  WITH NR 1 FWD PUMP ON, 115VAC CONSTANT ON ALL THREE PHASES B737-800 WDM 28-23-11.  PUMP INTERNAL CASE GROUND GOOD (.1 OHM) AND INSULATION >1M BETWEEN PINS 1, 2, 3 AND CASE GROUND 4, REF B737-800 AMM 28-22-00-760-802.  RECONNECTED D72, NR 1 FWD PUMP OPERATIONS NORMAL, BUT RECOMMEND REPLACEMENT DUE TO ABNORMAL CHATTERING NOISE DURING OPERATION.  REMOVED AND REPLACED NR 1 FWD BOOST PUMP, REF AMM 28-22-41-000-801 AND AMM 28-22-41-400-801.  OPERATIONS CHECK GOOD.

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