# SDR UIEA2023070500690

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 5, 2023
- Submitted: July 6, 2023
- Operation: Air carrier
- Aircraft: [N409MC](https://openairdocs.org/aircraft/N409MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 30558
- Aircraft time: 95,002 hours, 15,121 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Packing
- Part number: NAS16126A
- Part serial: NSN
- Condition: Unknown
- Location: Unknown
- Stage of operation: CL
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2023070500690

## Discrepancy

HYD QTY LOW 4  EICAS MESSAGE(<P>ITEM 1: FOUND ACCUMULATOR ISOLATION VALVE UPPER BLANK AND LOOSE, TIGHTENED 1 TURN IAW AMM 20-51-01 (FOR SOURCE SELECTOR 1 VALVE).  ITEM 4: LEAK CHECK C/W AND FAILED. ITEM 7: FOUND O-RING ON TOP PLUG OF ACCUMULATOR VALVE DAMAGED, REPLACED AND LEAK CHECK GOOD.</P>)

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