# SDR UIEA2025101001265

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 10, 2025
- Submitted: October 10, 2025
- Operation: Air carrier
- Aircraft: [N412MC](https://openairdocs.org/aircraft/N412MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 30559
- Aircraft time: 102,250 hours, 102,250 cycles
- System (JASC): [2913 · Hydraulic Pump (Electric/Engine), Main](https://openairdocs.org/jasc/2913)
- Part: Pump
- Part number: 3508806
- Part serial: MX527286
- Condition: Failed
- Location: Hyd System
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2025101001265

## Discrepancy

LOST #4 HYDRAULIC SYS ENROUTE TO JFK. EMERGENCY WAS DECLARED.  REMOVED & REPLACED #4 ENGINE DRIVEN PUMP IAW AMM- 29-11-05. LEAK & OPS CHECK GOOD.

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