# SDR ASAA2023081844666

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 18, 2023
- Submitted: August 21, 2023
- Operation: Air carrier
- Aircraft: [N442AS](https://openairdocs.org/aircraft/N442AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43293
- Aircraft time: 36,399 hours, 11,459 cycles
- System (JASC): [8010 · Engine Cranking](https://openairdocs.org/jasc/8010)
- Part: Switch
- Part number: 66002849
- Condition: Inoperative
- Location: Flight Deck
- Stage of operation: IN
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023081844666

## Discrepancy

WHILE PERFORMING TASK CARD 78273000, FOUND FAULT 73-10312 "THE START SWITCH SIGNAL AND ARINC BUS DATA DISAGREE" ON ENGINE 2. GROUNDED - YES. PERFORMED START SWITCH SIGNAL AND ARINC BUS DATA DISAGREE IAW B737-800 FIM 73-24 TASK 813. FOUND START SWITCH INOP. REMOVED AND REPLACED START SWITCH IAW AMM 80-11-00. OPS CHECK GOOD. NO DEFECTS NOTED AT THIS TIME.

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