# SDR ASAA2022040137870

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 1, 2022
- Submitted: April 5, 2022
- Operation: Air carrier
- Aircraft: [N531AS](https://openairdocs.org/aircraft/N531AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35199
- Aircraft time: 41,907 hours, 12,125 cycles
- System (JASC): [2840 · Fuel Indicating System](https://openairdocs.org/jasc/2840)
- Part: Pressure Switch
- Part number: 21C1321
- Condition: Faulty
- Location: R Wing Rear Spar
- Stage of operation: TX
- How discovered: V
- Nature of condition: P
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022040137870

## Discrepancy

DURING PREFLIGHT - WITH MAIN TANK FUEL PUMP "OFF" - TANK #2 "LOW PRESSURE" LIGHT WAS OUT. GROUNDED - YES. R/R AFT BOOST PUMP PRESSURE SWITCH IAW B737-800 AMM 28-42-11 OP/LEAK CHECK GOOD.

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