# SDR 2003F00379

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 16, 2003
- Submitted: June 11, 2003
- Operation: Air carrier
- Aircraft: [N6764C](https://openairdocs.org/aircraft/N6764C), registered now
- Make and model: Cessna 402C
- Registry model: [Cessna 402C](https://openairdocs.org/model/cessna-402c) (OpenAirDocs)
- Aircraft serial: 402C0628
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Line
- Part number: 510011194
- Condition: Cracked
- Location: Hyd System
- Stage of operation: LD
- 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/2003F00379

## Discrepancy

THE PILOT WAS UNABLE TO NORMALLY EXTEND THE LANDING.  EMERGENCY GEAR EXTENSION PROCEDURES WERE SUCCESSFUL.  SUBSEQUENT INSPECTION REVEALED THAT THE RIGHT GEAR EXTENSION PRESSURE LINE HAD DEVELOPED A .5 INCH CRACK JUST PRIOR TO THE LANDING GEAR UPLOCK ACTUATOR.  THE AIRCRAFT LOST HYDRAULIC FLUID.  THE CRACK IN A LOCATION WERE THE LINE MADE A 180 DEGREE BEND.  THE CRACK APPEARS TO BE CAUSED BY FATIGUE.  THE LINE WAS THE ORIGINAL LINE AND WAS 21 YEARS.  THE LINE WAS REPLACED.  (M)

---
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.