# SDR ASAA2019032328737

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 23, 2019
- Submitted: March 25, 2019
- Operation: Air carrier
- Aircraft: [N428AS](https://openairdocs.org/aircraft/N428AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36353
- Aircraft time: 12,263 hours, 4,002 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Warning System
- Condition: False Activation
- Location: Cockpit
- Stage of operation: TX
- How discovered: O
- Nature of condition: N
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019032328737

## Discrepancy

DURING AFTER START CHECKLIST FLOW, THE "MACH TRIM FAIL" LIGHT ILLUMINATING DURING MASTER CAUTION RECALL. GROUNDED - YES. CYCLED POWER PER AMM 20-60-99 ALL OPS RESTORED. ACCOMPLISHED DFCS BITE SHOWS NO FAULTS MACH TRIM SYS TEST PASSES, BOTH CHANNELS PER FIM 22-11 TASK 801.

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