# SDR 2009FA0000505

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 20, 2009
- Submitted: June 8, 2009
- Operation: General aviation
- Aircraft: [N4971V](https://openairdocs.org/aircraft/N4971V), registered now
- Make and model: Cessna 172RG
- Registry model: [Cessna 172RG](https://openairdocs.org/model/cessna-172rg) (OpenAirDocs)
- Aircraft serial: 172RG0436
- Engine: Lyc O360F1A6
- System (JASC): [3233 · Landing Gear Actuator](https://openairdocs.org/jasc/3233)
- Part: Actuator
- Part number: 98820152
- Condition: Cracked
- Location: Mlg
- Part time: 995 hours
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2009FA0000505

## Discrepancy

DURING OCCURRENCE THE BODY OF THE MLG ACTUATOR HAS CRACKED AT THE UPPER PORTIONOF THE GEAR CAVITY OR THE BOLT HOLES.  THE ACTUATOR BODY (-10) IS CONSTRUCTED FROM ALUMINUM WHILETHE PISTON/TRUNNION (-5) AND THE PISTON ROLLER (-11) ARE STEEL.  CONSIDERING THE OPERATIONAL CHARACTERSTICS OF THE SYS THERE SEEMS TO BE A TORQUE LOAD BEING APPLIED TO THE BODY DURING LANDING.  AS A RESULT THE ACTUATOR BODY IS CRACKING AT THE ATTACH POINT BOLT HOLES.

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