# SDR ASAA2019030528478

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 5, 2019
- Submitted: March 7, 2019
- Operation: Air carrier
- Aircraft: [N403AS](https://openairdocs.org/aircraft/N403AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41730
- Aircraft time: 25,227 hours, 8,295 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/ASAA2019030528478

## Discrepancy

AFTER PUSH-BACK AND MASTER CAUTION RECALL, FLT CREW OBSERVED SPEED TRIM AND MACH TRIM CAUTION LIGHT. GROUNDED - YES. FOUND DFCS SYS "B" INOP. CYCLED C/B'S ON P6-2 B1,B2,B4,C1, C2 AND C3 REF FIM 22-11 TASK 826 AND DFCS "B" POWERED UP. PERFORMED FCC INSTALLATION TEST PER AMM 22-11-33-401-801, OPS CKS NORMAL. FCC "B" MACH TRIM AND SPEED TRIM OPS NORMAL PER FIM 22-11 TASK 801.

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