# SDR ASAA2020092033203

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 20, 2020
- Submitted: September 22, 2020
- Operation: Air carrier
- Aircraft: [N593AS](https://openairdocs.org/aircraft/N593AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35107
- Aircraft time: 46,436 hours, 13,988 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Autopilot Sys
- Condition: Disconnected
- Location: A System
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020092033203

## Discrepancy

AT CRZ FL380, SMOOTH AIR, AUTOPILOT "A" DISENGAGED FOR NO APPARENT REASON.  ALL SYSTEM & ENGINE INDICATIONS WERE NORMAL AT THE TIME.  AUTO PILOT "A" WAS REENGAGED WITH NO FURTHER ISSUES.  GROUNDED-YES.  PERFORMED DFCS OPS TEST/AUTOTEST, IAW B737-800 AMM 22-11-00-740-801, NO FAULTS CURRENT.  RAN ADDITIONAL TEST FOR AUTOPILOT A+B, DUAL CHANNEL, ALL TEST PASS.  AUTOPILOT "A" DISCONNECT WAS PRESENT IN FAULT HISTORY, REF B737-800 AMM 22-10-00-740-806.

---
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.