# SDR ASAA2017082321709

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 23, 2017
- Submitted: August 25, 2017
- Operation: Air carrier
- Aircraft: [N462AS](https://openairdocs.org/aircraft/N462AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36362
- Aircraft time: 13,208 hours, 4,356 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Trim System
- Condition: Malfunctioned
- Location: Mach
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017082321709

## Discrepancy

MACH TRIM FAILURE ANNUNCIATOR ON RECALL AFTER ENGINE START. CANCELS ON MASTER CAUTION RESET.  ACFT GROUNDED. FOUND AFCS SYSTEM A CANCEL EXC AC BRAKE OPEN ON PA18-1 PANEL. RESET THE CIRCUIT BREAKER IAW AMM 20-60-1. PERFORMED BITE CHECK MACH TRIM SYSTEM IAW AMM 221-11-00-740-806. MACH TRIM SYSTEM OPERATIONAL CHECKED GOOD.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.