# SDR SWAA2018040921012

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 6, 2018
- Submitted: April 9, 2018
- Operation: Air carrier
- Aircraft: [N7886A](https://openairdocs.org/aircraft/N7886A), registered now
- Make and model: Boeing 737752
- Aircraft serial: 35122
- Aircraft time: 36,877 hours, 17,580 cycles
- System (JASC): [3420 · Attitude and Direction Data System](https://openairdocs.org/jasc/3420)
- Part: Reference Unit
- Part number: HG2050AC07
- Part serial: 56011852
- Condition: Faulty
- Location: Nr 1
- Stage of operation: CL
- How discovered: O
- Nature of condition: P
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2018040921012

## Discrepancy

DURING  CLIMB OUT.  LOST LNAV, VNAV AND SOME FMC FUNCTIONS INCLUDING ROUTE WHICH WENT INACTIVE. LOST SPEED BANDS AND SOME MCP FUNCTIONS. FLT DIRECTORS LOST. AFTER TROUBLESHOOTING SYSTEM CAME BACK AFTER 10-15 MINS.  DIVERTED.   R & R THE NR 1 AIR DATA INTERIAL REFERENCE DATA UNIT IAW MM.

---
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.