Transport Canada CF-2020-05

Requires a special detailed inspection of the aileron internal structures from aileron inboard end to outboard end, including front and rear spars, all aileron ribs, upper and lower skins, for cracks, creases or buckling, corrosion, damage to fasteners or other defects, using a flexible borescope through existing aileron drain holes, and immediate repair or replacement, if necessary. This AD stems from reports of cracks and corrosion damage found the aileron internal structure an in-service airplane.