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SAIB: CE-11-06 Main Landing Gear – Tires and Wheels

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This Special Airworthiness Information Bulletin (SAIB) alerts you, registered owners and operators of small airplanes, to follow established safety criteria, guidance, and data when modifying your aircraft with tires that are oversized compared to the original equipment Federal Aviation Administration- (FAA-) approved type design. Oversized tires have been FAA approved by supplemental type certificates (STC) and field approvals on numerous small aircraft types for an assortment of reasons, such as maintaining ground clearance when installing larger propellers or improving landing performance for unique conditions. These oversized tires have customarily been referred to as “Tundra” tires.
At this time, the FAA has determined that this airworthiness concern is not an unsafe condition that would warrant airworthiness directive (AD) action under Title 14 of the Code of Federal Regulations (14 CFR) part 39. Investigation of a recent accident highlights the need for reminding operators of part 23 certificated airplanes that oversized tire modifications require analysis and substantiation as well as periodic inspections to prevent unsafe conditions. This SAIB reiterates the criteria to apply when evaluating the use of oversized tires and for determining the appropriate requirements to obtain necessary FAA approval.

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