5-2, DESCRIPTION. Flat spring-steel main landing gear struts are installed on 1989 thru 1970 model aircraft. This installation is illustrated in figure 5-1, sheet 1. Beginning with 1971 models, tubular spring steermain gear struts are installed, and are illustrated on sheet 2 of figure 5-1. All models are equipped with air/oil, steerable nose gear shock struts. A bracket to attach a step to each main gear strut is bonded with an epoxy-base adhesive. Wheels with disc -type brakes and tube-type tires are installed.