# SDR ASAA2022061038614

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 10, 2022
- Submitted: June 13, 2022
- Operation: Air carrier
- Aircraft: [N407AS](https://openairdocs.org/aircraft/N407AS), registered now
- Make and model: Boeing 737-900ER
- Registry model: [Boeing 737-900ER](https://openairdocs.org/model/boeing-737-900er) (OpenAirDocs)
- Aircraft serial: 41731
- Aircraft time: 35,925 hours, 11,238 cycles
- System (JASC): [2840 · Fuel Indicating System](https://openairdocs.org/jasc/2840)
- Part: Switch
- Part number: 21C1321
- Condition: Faulty
- Location: Left Mlg Wheel W
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022061038614

## Discrepancy

DURING CROSSFEED OPERATION #1 LOW PRESSURE LIGHT DID NOT ILLUMINATE WHEN OFF SELECTED. LIGHT DOES WORK WHEN LIGHTS TEST COMPLETE & PUSH TO TEST. GROUNDED - YES. REPLACED #1 AFT LOW PRESSURE SWITCH PER B737-900 AMM 28-42-11. OPS CHECKED PER AMM 28-22-41. #1 LOW PRESSURE SWITCH ILLUMINATES WHEN SELECTED OFF AND DURING CROSSFEED OPERATION. OPS CHECK GOOD.

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