# SDR DXTA2025011301927

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 11, 2025
- Submitted: January 13, 2025
- Operation: Air carrier
- Aircraft: [N591QS](https://openairdocs.org/aircraft/N591QS), registered now
- Make and model: Cessna 680A
- Registry model: [Cessna 680A](https://openairdocs.org/model/cessna-680a) (OpenAirDocs)
- Aircraft serial: 680A0144
- Aircraft time: 6,934 hours, 4,554 cycles
- System (JASC): [2900 · Hydraulic Power System](https://openairdocs.org/jasc/2900)
- Part: Screw
- Part number: S322C1020
- Part serial: NSN
- Condition: Loose
- Stage of operation: DE
- 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/DXTA2025011301927

## Discrepancy

HYDRAULIC SYSTEM PRESSURE INDICATION: DURING DESCENT INTO IAD AT 29,000', WE NOTICED THAT HYDRAULIC PRESSURE BEGAN TO FLUCTUATE AND WOULD DROP TO ZERO "---". THIS AROUND 1848Z. NO CAS INDICATION AND NO LOSS OF SYSTEMS. CORRECTIVE ACTION: TIGHTENED GROUND ATTACHMENT SCREWS. REPLACED PANEL SCREWS. IAW CE-680A AMM 20-30-00 & 20-10-65

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