# SDR IPXA2023070402978

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 4, 2023
- Submitted: July 5, 2023
- Operation: Air carrier
- Aircraft: [N391UP](https://openairdocs.org/aircraft/N391UP), registered now
- Make and model: Boeing 767304
- Aircraft serial: 28039
- Aircraft time: 88,293 hours, 18,404 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Part number: RHFMC4052506955L
- Part serial: RHFMC9702905
- Condition: Frozen
- Location: Unknown
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2023070402978

## Discrepancy

AIRTURN BACK DUE TO BOTH FMC UNRESPONSIVE IN LEGS + ROUTE PAGES ENTIRE ROUTE WAS ERASED. BOTH FMC IN STANDBY ONE. REPLACED BOTH FMC IAW AMM: 34-61-02/401, REV: 139. OPS TEST SATIS, VERIFIRED CORRECT SOFTWARE P/N ARE INSTALLED IAW SOFTWARE MATRIX, REV: 130.<BR><BR>CRN97068215 / ULLMER / Q9DY421Y

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