NTSB Identification: CHI07LA011.
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Accident occurred Sunday, October 22, 2006 in Ames, IA
Probable Cause Approval Date: 01/31/2008
Aircraft: Cessna R182, registration: N5274S
Injuries: 2 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
The airplane was operated as an instructional airplane when the nose landing gear collapsed during landing. The flight instructor stated that he and the dual student did not receive "a green light indicating gear down and locked" when landing. They reported cycling the landing gear several times but could not get a down and locked indication. Examination of the landing gear revealed that the two nose gear down lock actuator pins exhibited fatigue fracture over 70 percent of the fracture surface. Cessna service bulletin SEB95-20, recommends a reoccurring 200-hour inspection of the down lock pins for looseness. If looseness or movement is observed, Service kit SK210-155 is to be installed prior to further flight. The service bulletin does not provide for the visual inspection of the pins for fatigue cracks The pins were of the older design, and were reportedly inspected and no looseness was observed. Following the accident, the operator reported that one of the fractured pins was still not loose until he exerted a greater amount of force to check for looseness.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The fatigue failure of the landing gear actuator pin and the exterior visual maintenance inspection for cracks not possible by company maintenance personnel. Full narrative available
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