# SDR AALA202402275616

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 26, 2024
- Submitted: February 27, 2024
- Operation: Air carrier
- Aircraft: [N812NN](https://openairdocs.org/aircraft/N812NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 33520
- Aircraft time: 42,894 hours, 17,979 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Part number: 1762000101
- Part serial: 12527
- Condition: Faulty
- Location: Left
- Part time: 21,193 hours, 90,941 cycles
- Stage of operation: CL
- How discovered: V
- Nature of condition: G
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202402275616

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO:  AFTER ROTATION BOTH PFDS LOST ALL VERTICAL AND LATERAL NAVIGATION; AIRCRAFT RETURN TO AND LANDED SAFELY AT DFW. REMOVED AND REPLACED LEFT (FMC) FLIGHT MANAGEMENT COMPUTER. PER AMM 34-61-02, OPERATIONAL TEST GOOD, NO FAULTS FOUND.

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