# SDR IPXA2026032687247

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 26, 2026
- Submitted: March 26, 2026
- Operation: Air carrier
- Aircraft: [N634UP](https://openairdocs.org/aircraft/N634UP), registered now
- Make and model: Boeing 747-8F
- Registry model: [Boeing 747-8F](https://openairdocs.org/model/boeing-747-8f) (OpenAirDocs)
- Aircraft serial: 37564
- Aircraft time: 35,857 hours, 5,322 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Part number: 4052508960
- Part serial: 40274582
- Condition: Inoperative
- Location: Zone 200
- Stage of operation: CR
- How discovered: O
- Nature of condition: P
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2026032687247

## Discrepancy

AIR TURN BACK DUE TO NO NAVIGATION INFO ON ND. FMC LT & RT NORMAL.  CURRENT LEG FAULT FMC-L FAIL INTERMITTENT AND FMC-R INTERNAL LOW PRIORITY FAILURE. REPLACED LEFT AND RIGHT FMC€™S REF AMM 34-61-01. VERIFIED CORRECT SOFTWARE PART NUMBERS ON CAPT AND F/O MCDU€™S REF AMM 34-61-00-752-101. PERFORMED GROUND TEST ON LEFT AND RIGHT FMC€™S REF AMM 34-61-00-745-222. BOTH LEFT AND RIGHT FMC PASS.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.