Airworthiness Directives; REVO, Incorporated Models Colonial C-2, Lake LA-4, Lake LA-4A, Lake LA-4P, and Lake LA-4-200 Airplanes

This amendment adopts a new airworthiness directive (AD) that applies to all REVO, Incorporated (REVO) Models Colonial C-2, Lake LA- 4, Lake LA-4A, Lake LA-4P, and Lake LA-4-200 airplanes. This action requires measuring for a clearance of \5/32\ of an inch between the attachment fitting and the horizontal stabilizer rear beam, and a clearance of \1/16\ of an inch between the attachment fitting and the stabilizer skin. If either area does not meet these minimum measurements, this AD requires removing the affected horizontal tail half from the airplane and inspecting the attachment fitting for any evidence of fretting, cracking, or corrosion. If cracks, fretting, or corrosion are present, the attachment fitting must be replaced with a new fitting, and the stabilizer skin must be trimmed to provide a positive clearance for the fitting. This action is prompted by an incident report of an airplane losing control during flight after the attachment fitting to the horizontal stabilizer fractured. The actions specified by this AD are intended to prevent fatigue cracks to the horizontal and vertical stabilizer attachment fitting, which could result in loss of control of the airplane.