SB2X-71-21 Upper Cowl Flexing affects a small number of SR22 airplanes. When the SR22T came on line a couple of years ago, we worked to create a common upper cowl between the SR22T and the SR22. To do this, we had to cut back some of the foam in the composite cowl for clearance to some parts on the SR22T. This area was supported by baffle ramps in the SR22T but there is no similar support in the SR22.
So over time, during high speed descents this local area (front right) of the cowl begins to bulge. This doesn't have any affect on the strength of the cowl, but it does result in a cosmetic issue (cracking paint) at a very early time (about 1 year). Our solution is to go back and put some foam back into the layup during production, and a similar field fix to put foam and fiberglass on the cowl to stiffen this area.
SB2X-05-02 Induction Duct Flapper Bolt Replacement Interval involves pre-perspective airplanes. There is a bolt that holds the alt air flapper valve and over time this bolt wears to the point where the nut and cotter pin could come loose. When that happens, it could cause the bolt and flapper valve to vibrate to the point where the bushing or other attaching hardware could break loose and get injested in the engine. There is an inspection point for this bolt at the annual maintenance interval, and this service bulletin adds a recommended replacement interval of 2 years or 500 hours for this bolt.
