# SDR ASAA2013051394798

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 13, 2013
- Submitted: May 15, 2013
- Operation: Air carrier
- Aircraft: [N538AS](https://openairdocs.org/aircraft/N538AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 41188
- Aircraft time: 3,884 hours, 1,122 cycles
- System (JASC): [2220 · Speed-Attitude Correction System](https://openairdocs.org/jasc/2220)
- Part: Circuit Breaker
- Condition: Tripped
- Location: Mach Trim
- 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/ASAA2013051394798

## Discrepancy

MACH TRIM FAIL ILLUMINATES ON RECALL.  ACFT GROUNDED. ON INITIAL DFCS BITE, FCC A SELF TEST FAILED.  FOUND MACH TRIM AC CIRCUIT BREAKER OUT.  RESET CIRCUIT BREAKER IAW RESET PROCEDURES IAW MM 20-60-01.  NO DEFECTS NOTED.   PERFORMED DFCS LRU INTERFACE TEST FOR FCC (DFCS/AT) BITE GRP NR 35 IAW AMM 22-11-33, LAND VERIFY TEST BITE NR 49 IAW AMM 22-11-00, HGS SENSOR TEST FOR FCC/AT AND HGS OPS TEST IAW SMM 34-36-00, ALL OPS NORMAL, NO FAULTS FOUND OR DEFECTS NOTED.  ACFT LWMP STATUS & SCREW UPGRADED TO CATIIIA A/L & HGS.

---
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.