# SDR ASAA2021101336288

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 13, 2021
- Submitted: October 18, 2021
- Operation: Air carrier
- Aircraft: [N442AS](https://openairdocs.org/aircraft/N442AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43293
- Aircraft time: 29,606 hours, 9,469 cycles
- System (JASC): [2840 · Fuel Indicating System](https://openairdocs.org/jasc/2840)
- Part: Pressure Switch
- Part number: 21C1321
- Condition: Faulty
- Location: L Wing Rear Spar
- Stage of operation: NR
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021101336288

## Discrepancy

#1 AFT MAIN FUEL PUMP LOW PRESSURE LIGHT DID NOT ILLUMINATE WHEN TURNED OFF. GROUNDED - YES. VERIFIED N O HARD FAULT FOUND. REMOVED AND REPLACED AS A PRECAUTION L/H AFT FUEL BOOST PUMP PSI SWITCH REF B737-900 AMM 28-42-11. OPS AND LEAK CK GOOD. NO DEFECTS NOTED.

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