# SDR AALA201807276001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 25, 2018
- Submitted: July 27, 2018
- Operation: Air carrier
- Aircraft: N186AN
- Make and model: Boeing 757223
- Aircraft serial: 32380
- Aircraft time: 60,973 hours, 15,113 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Part number: 4052506955
- Part serial: 0107F626
- Condition: Intermittent
- Location: Nr 1
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201807276001

## Discrepancy

SHORTLY AFTER TAKEOFF,  BOTH LEFT AND RIGHT FLIGHT MANAGEMENT COMPUTERS LOCKED UP AND WERE INOPERATIVE. CREW WAS DIRECTED MY MAINTENANCE CONTROL NOT TO ATTEMPT CIRCUIT BREAKER RESET. THE FLIGHT DECLARED AN EMERGENCY AND RETURNED TO DEPARTURE AND LANDED WITHOUT INCIDENT.  THE AIRCRAFT WAS GROUNDED.  MAINTENANCE REPLACED THE NR 1 FLIGHT MANAGEMENT COMPUTER IAW AMM 34-61-01.

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