# SDR ASAA2023072544232

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 25, 2023
- Submitted: July 28, 2023
- Operation: Air carrier
- Aircraft: [N434AS](https://openairdocs.org/aircraft/N434AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 61620
- Aircraft time: 27,245 hours, 8,451 cycles
- System (JASC): [8000 · Engine Starting System](https://openairdocs.org/jasc/8000)
- Part: Switch
- Part number: 66002849
- Condition: Faulty
- Location: #1 Engine
- Stage of operation: IN
- 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/ASAA2023072544232

## Discrepancy

REF. T/C 78273000 #1 ENG. HAS FAULT MESSAGE 73-303111 " THE START SWITCH SIGNAL AND ARINC BUS DATA DISAGREE" SHORT TIME FAULT. GROUNDED - YES. (RESOLVED ON W/O: 1963379 TASKCARD: N/R-00001 ) FAULT PRESENT ON EVERY LEG INCLUDING LEG 0, REPLACED #1 START SWITCH REF AMM 80-11-00 1 C/B OPEN & CLOSED. START SWITCH TEST PASS REF AMM 80-11-00-730-801-F00 FAULT HAS MOVED OFF LEG 0.PLT CLEARED SEAMC DARWIN NOTIFIED.

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