# SDR U2RA2021030400002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 23, 2021
- Submitted: March 4, 2021
- Operation: Air carrier
- Aircraft: [N919CA](https://openairdocs.org/aircraft/N919CA), registered now
- Make and model: Boeing 747428
- Aircraft serial: 25302
- Aircraft time: 101,456 hours, 15,107 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Part number: 4052508960
- Part serial: 00778668
- Condition: Failed
- Location: Right
- 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/U2RA2021030400002

## Discrepancy

DISCREPANCY:  LP 43593 - AIRCRAFT ENCOUNTERED A FAULT IN THE RIGHT FLIGHT MANAGEMENT COMPUTER (FMC).  SIMULTANEOUSLY WITH THIS FAULT, AN AUTO-PILOT (A/P) CAUTION ILLUMINATED WITH AN UNCOMMANDED "NOSE DOWN" PITCH IN THE AIRCRAFT WITH THE A/P ENGAGED.  IMMEDIATE ACTIONS:  A/P WAS DISCONNECTED AND NOSE DOWN CONDITION CORRECTED.  NO FURTHER ISSUES DURING THE REMAINDER OF THE FLIGHT.  CORRECTIVE ACTION:  THE RIGHT FMC WAS REPLACED WITH OPS CHECK NORMAL, AND THE A/P SYSTEM WAS WAS FUNCTIONALLY TESTED THROUGH ALL PARAMETERS WITH NO ISSUES NOTED.

---
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.