# SDR DXTA2015111306123

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 13, 2015
- Submitted: November 16, 2015
- Operation: Air carrier
- Aircraft: [N920QS](https://openairdocs.org/aircraft/N920QS), registered now
- Make and model: Cessna 750
- Registry model: [Cessna 750](https://openairdocs.org/model/cessna-750) (OpenAirDocs)
- Aircraft serial: 7500120
- Aircraft time: 14,415 hours, 8,799 cycles
- System (JASC): [3233 · Landing Gear Actuator](https://openairdocs.org/jasc/3233)
- Part: Actuator
- Part number: 99144512
- Part serial: 256
- Condition: Failed
- Location: Mlg
- Part time: 14,415 hours, 8,799 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/DXTA2015111306123

## Discrepancy

NOSE GEAR DID NOT CATCH ON UNLOCK AFTER TAKEOFF.  PERFORMED GEAR BUMP TROUBLESHOOTING.  NLG & LT MLG ARE FUNCTIONING NORMALLY.  FOUND THE RT MLG UPLOCK ACTUATOR TO BE CYCLING UNCOMMANDED,  FOLLOWING THE RETRACT CYCLE CAUSING RT GEAR TO HAMMER UP & DOWN IN THE WW.  UPLOCK SWITCHES FUNCTION & ENGAGEMENT RIGGING CHECKED GOOD.  REMOVED RT MLG ACTUATOR, UPLOCK ACTUATOR & SPRING.  ADJUSTED RT MLG CAMBER.  CYCLING & HAMMERING OF RT MLG AFTER RETRACTION IS NO LONGER PRESENT.  RIGGED UPLOCK SWITCHES & EMERGENCY RELEASE SYS.  DISCOVERED EXCESSIVE MOVEMENT OF THE MLG RELEASE SECTOR IN THE MLG WW.  INSTALLED NEW BUSHING THAT WAS MISSING BETWEEN THE PIVOT BOLT & BEARING.  GEAR EXTENSION & RETRACTION OPERATING NORMAL.

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