# SDR ASAA2017100822149

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 8, 2017
- Submitted: October 10, 2017
- Operation: Air carrier
- Aircraft: [N588AS](https://openairdocs.org/aircraft/N588AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35685
- Aircraft time: 37,920 hours, 11,516 cycles
- System (JASC): [2420 · AC Generation System](https://openairdocs.org/jasc/2420)
- Part: Warning Light
- Condition: False Activation
- Location: Nr 1 Source.
- Stage of operation: AP
- How discovered: V
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017100822149

## Discrepancy

ON VECTORS FOR APPROACH,  NR 1 SOURCE OFF LIGHT ILLUMINATED.  FOLLOWED QRH AND PUT APU ONLINE.  ACFT GROUNDED.  PERFORMED THE INSTRUMENT LANDING OPERATIONAL TEST IAW AMM 34-31-00-710-801 AND THE AIR DATA REFERENCE SYSTEM SELECT OPERATIONAL TEST IAW AMM 34-21-00-710-802. COULD NOT DUPLICATE DEFECT.  SOURCE OFF INDICATOR IS NOT ON.

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