Accident Cessna 172RG N6272R, Saturday 10 January 2009
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Date:Saturday 10 January 2009
Time:11:00 LT
Type:Silhouette image of generic C72R model; specific model in this crash may look slightly different    
Cessna 172RG
Owner/operator:National Pilot Academy
Registration: N6272R
MSN: 172RG0134
Year of manufacture:1979
Total airframe hrs:5031 hours
Engine model:Lycoming O-360
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Location:Carson City, Nevada -   United States of America
Phase: Approach
Departure airport:Carson City Airport, NV (CSN/KCXP)
Destination airport:Carson City Airport, NV (CSN/KCXP)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
During the landing approach the pilot was unable to fully extend the right main landing gear. Following multiple troubleshooting attempts he retracted the left and nose landing gear and performed a partial gear-up landing. During the landing sequence the airplane sustained substantial damage to the belly structure. Postaccident examination revealed multiple fractures in the right main landing gear actuator housing and mechanical damage to the internal piston rack. Analysis of the fractures revealed that they had failed in overload. Examination of an exemplar actuator, piston, and sector gear revealed that the mechanical damage to the teeth on the sector gear occurred after the initial failure of the actuator housing and was not causal to the failure. The airplane manufacturer had released a service bulletin addressing repeated inspections for cracks at a specific location in the actuator body, a typical procedure for monitoring of fatigue cracks. Although it appeared that the operator had not complied with the service bulletin, the primary cracks were in a different location and displayed features consistent with an overload event. Although the airplane had been used for flight training, and the overload failure of the actuator was likely caused by a prior hard landing, the investigation was unable to determine the initiating event.

Probable Cause: The overload failure of the landing gear actuator at an undetermined time.

Accident investigation:
Investigating agency: NTSB
Report number: WPR09LA083
Status: Investigation completed
Duration: 1 year and 9 months
Download report: Final report




Revision history:

04-Oct-2022 08:25 ASN Update Bot Added

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