# SDR 2009FA0000482

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 27, 2009
- Submitted: June 3, 2009
- Operation: General aviation
- Aircraft: [N441FS](https://openairdocs.org/aircraft/N441FS), registered now
- Make and model: Cessna 441
- Registry model: [Cessna 441](https://openairdocs.org/model/cessna-441) (OpenAirDocs)
- Aircraft serial: 4410318
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Line
- Condition: Cracked
- Location: Hydraulic Sys
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2009FA0000482

## Discrepancy

HYDRAULIC FLUID DEPLETION HAVE OCCURRED.  (TWO WERE FLAP FAILURE TO EXTEND AND ONE THE LANDING GEAR HAD TO BE EXTENDED USING THE EMERGENCY EXTENSION SYS.  THESE FAILURES WERE CAUSED BY A CRACK AND LEAK FORMING IN A .3750 ALUM ALLOY HYDRAULIC LINE AT A BEND RADII.  NOTE: (1ST) THE CRACKS FORMED AT A BEND THAT WERE AT  THE INDUSTRY MIN RECOMMENDED RADII FOR TUBING. (2ND) THESE CRACKS FORMED AT WHAT LOOKED AS A MINOR TOOL DIE MARK OR STRESSED AREA IN THE BEND RADII. RECOMMEND ACFT HAVE ALL THE HYDRAULIC LINES INSPECTED BY REMOVING THE PAINT AT ANY BEND RADII ON HYDRAULIC LINE THAT LOOKS TO BE AT THE MINIMUM BEND RADII FOR ANY TOOLING DIE AND STRESS MARKS AND REPLACE THAT LINE.  ANY LINE THAT APPEARS TO BE UNDER THE MIN BEND RADII SHOULD BE REPLACED.  (K)

---
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.