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Undercarriage
Lift one wing to check wheel bearings and main leg tightness. There is a PFA mod 10818 for the 2 seaters which permits an increase in the size of the rear bolts to AN6 which provides a much more secure undercarriage mounting. In any event, ensure that undercarriage legs are not loose by getting an assistant to lift a wing and shaking each leg in turn. Undercarriage Bolts Be very careful to ensure that these don't become thread bound. If this happens, you'll lose clamping action on the undercarriage leg assembly and the undercarriage will become loose. If this happens, the undercarriage will flop about, and in extreme cases, this could lead to the undercarriage bolts breaking from being bent back and forth due to plastic deformation. Putting a few washers under the nuts can prevent the bolt from becoming thread bound, but you should ensure you still have at least 1.5 threads showing at the top of the nut. Due to the nature of aviation bolts, the threaded past isn't long so you may need to replace the bolts with those of slightly different length so as to provide correct fit. Note that we strongly recommend the replacement of the rear bolts to AN6 as per the PFA's modification approval ref 10818 on all 2 seaters.
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