# SDR ASAA2016090117913

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 1, 2016
- Submitted: September 6, 2016
- Operation: Air carrier
- Aircraft: [N597AS](https://openairdocs.org/aircraft/N597AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35689
- Aircraft time: 32,122 hours, 9,941 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [7320 · Fuel Controlling System](https://openairdocs.org/jasc/7320)
- Part: Switch
- Part number: 2688072
- Condition: Failed
- Location: Nr 1 Hmu
- Stage of operation: NR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2016090117913

## Discrepancy

LEFT ENGINE FUEL VALVE CLOSED LIGHT DOES NOT APPEAR TO GO BRIGHT WHEN VALVE TRANSITIONS.  ACFT GROUNDED. RANG OUT THE NR 1 ENGINE HMU SWITCH VIA DP1207, PINS 1 AND 3. READS OPEN. SWITCH STUCK OPEN. REMOVED AND REPLACED HIGH PRESSURE SHUTOFF VALVE SWITCH IAW  AMM 73-21-09-000-801 AND 73-21-09-400-801.

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