# SDR CALA2025121812215

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 15, 2025
- Submitted: December 18, 2025
- Operation: Air carrier
- Aircraft: [N2138U](https://openairdocs.org/aircraft/N2138U), registered now
- Make and model: Boeing 777-300ER
- Registry model: [Boeing 777-300ER](https://openairdocs.org/model/boeing-777-300er) (OpenAirDocs)
- Aircraft serial: 62649
- Aircraft time: 36,138 hours, 3,874 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Part number: 4917740
- Part serial: 108150117
- Condition: Failed
- Location: Zone 100
- Part time: 36,123 hours, 3,873 cycles
- Stage of operation: CL
- 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/CALA2025121812215

## Discrepancy

SHORTLY AFTER T/O L FMC FAILURE. ACCOMPLISHED NON-NORMAL. NO HEL P FMC AND DISPLAY UNIT ORDERED TO B29. NO FMC FAULTS AT CURRENT TIME OR IN RECENT HISTORY. ACOMPLISHED FMC OPERATIONAL TEST AND SYSTEM TEST REF AMMS 34-61-00-710-801 AND 34-61-00-730-801. INCLUDING BOTH AIMS' OPERATIONAL TEST/ RESET REF AMM TASK 31-41-00-710-801.NO FAULTS. REINSTALLED NAV COMPUTER, PRIMA  IAW AMM TASK 34-61-00-470-801.  FMC IS NOT A INDIVUAL UNIT TO BE INSTALLED. REF SDS 34-61-00-002. PER MANAGEMENT REQUEST INSTALLED LEFT PFC PER AMM TASK 27-02-01-000/400-801. S/W AND OPS TESTS GOOD. NO PFC FAULTS.

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