If you’ve had the aileron hinges replaced on your high-wing Cessna in the last year they likely need to be inspected and possibly replaced. McFarlane Aviation Products has issued a Service Bulletin for hinges made between Feb. 22, 2019 and Jan. 3, 2020. Material defects have been discovered in some hinges made during that period and the job lots of the affected hinges are listed in the MSB. Because the numbers are on the inside of the hinge when installed, the job lots of the installed parts are best sourced from the maintenance logs.
If your airplane has the affected hinges, they must be disassembled and inspected within 25 hours or before July 7, 2020. If there are any extrusion cracks noted, the hinges have to be replaced. It’s a one-time inspection and no recurring inspections are required. The affected models are 150, 152, 170, 172, 175, 180, 182, 185, 205, and 210.