# SDR DXTA2013012105250

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 18, 2013
- Submitted: January 24, 2013
- Operation: Air carrier
- Aircraft: [N603QS](https://openairdocs.org/aircraft/N603QS), registered now
- Make and model: Cessna 560XL
- Registry model: [Cessna 560XL](https://openairdocs.org/model/cessna-560xl) (OpenAirDocs)
- Aircraft serial: 5605203
- Aircraft time: 9,881 hours, 7,951 cycles
- System (JASC): [3230 · Landing Gear Retraction/Extension System](https://openairdocs.org/jasc/3230)
- Part: Uplock Hook
- Part number: 664163413
- Condition: Failed
- Location: Mlg
- Part time: 9,881 hours, 7,951 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2013012105250

## Discrepancy

AFTER TAKEOFF AND SELECTING GEAR UP, RED "UNSAFE" AND AMBER "HYD PRESS" LIGHT REMAINED ILLUMINATED.  AFTER APPROX 1-2 MINUTES A LOUD THUMP WAS HEARD FROM THE LT MAIN GEAR.  THE "HYD CONTROL" CIRCUIT BREAKER WAS PULLED IAW ABNORMAL CHECKLIST PROCUDURE.  WHEN CIRCUIT BREAKER WAS PULLED, THE LT MAIN EXTENDED WITH A LOUD THUMP, AND THE LT GREEN DOWN/LOCKED LIGHT ILLUINATED.  RESET THE "HYD CONTROL" CIRCUIT BREAKER AND SELECTED GEAR DOWN, AND RECEIVED THREE GREEN & NO RED.  REPLACED LANDING GEAR CONTROL PCB, UPLOCK HOOK ASSY, AND SPRING IAW MM 32-30-05. OPS CHECKED GOOD IAW MM 32-01-00, 32-30-00, & 32-90-10.

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