# SDR ASAA2017052720883

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 27, 2017
- Submitted: May 30, 2017
- Operation: Air carrier
- Aircraft: [N483AS](https://openairdocs.org/aircraft/N483AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36350
- Aircraft time: 6,980 hours, 2,378 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Warning Message
- Condition: False Activation
- Location: Autopilot
- Stage of operation: CR
- How discovered: 9
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017052720883

## Discrepancy

AUTOPILOT B DISCONNECTED 3 TIMES AT CRUISE.  ABLE TO RECONNECT AFTER EACH EVENT. FAULT CODE 221 090 00.  ACFT GROUNDED.   PERFORMED DFCS BITE IAW FIM 22-11 TASK 801.  NO FAULTS. FLT LEG 1 HAS FAULT - MCP DATA INV - MSG 22-11607. PERFORMED FIM 22-11 TASK 817. NO FAULTS. MODE CONTROL PANEL TESTED OK IAW FIM 22-11 TASK 803.

---
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.