# SDR ASAA2022032437792

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 24, 2022
- Submitted: March 30, 2022
- Operation: Air carrier
- Aircraft: [N921AK](https://openairdocs.org/aircraft/N921AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 43337
- Aircraft time: 1,488 hours, 448 cycles
- Engine: Ge CFM567B24
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: CR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022032437792

## Discrepancy

A/C ON A/P B LOST FLT PLAN AND LNAV ALONG WITH A/P D/RST AND P/RST FLASHING CAUTION LIGHTS. TRANSFERRED TO A A/P AND ENGAGED LNAV. OPERATED NORMALLY ON A SIDE. ALL MESSAGES CLEARED BY THEMSELVES. REENGAGED B SIDE AND OPERATED NORMALLY. GROUNDED - YES. PERFORMED DFCS BITE REF B737-9 AMM 22-11-00. NO FAULTS FOUND AND AUTOPILOT TESTS PASSED..

---
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.