# SDR IPXA2019050941931

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 8, 2019
- Submitted: May 10, 2019
- Operation: Air carrier
- Aircraft: [N459UP](https://openairdocs.org/aircraft/N459UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 25480
- Aircraft time: 28,144 hours, 17,575 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Condition: Locked
- Location: Cockpit
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2019050941931

## Discrepancy

INSPECTION TYPE:SDR AIR TURN BACK. BOTH FMC'S FROZE UP AND SHOWED STANDBY ONE IN SCRATCH PAD. UNABLE TO CLEAR SCRATCH PAD & ENTIRE ROUTE CLEARED OUT INCLUDING PERFORMANCE PAGE. REPLACED LT FMC PRECAUTIONARY PER AMC. R&R'D LT FMC IAW AMM 34-61-01-2.  OPS CHECK GOOD.

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