EASA SIB CE-11-06: Small Aeroplanes - Main Landing Gear (Tundra) Tires and Wheels

What to do

Operators planning to install oversized tires must secure FAA-approved supplemental type certificates or field approvals based on approved data before modification. They should conduct initial and annual fluorescent penetrant inspections of wheels, use only approved tires and new tubes, determine appropriate tire pressures in consultation with manufacturers and FAA guidance, and monitor tire condition and pressure at least every two weeks. Reviewing FAA Advisory Circular AC 23-17B and SAFO 10007 is also recommended for comprehensive safety information.

Summary

The FAA Special Airworthiness Information Bulletin SAIB: CE-11-06 provides guidance on the use of oversized main landing gear tires, commonly known as tundra tires, on small airplanes including the Allied Ag Cat Productions, Inc. Model G-164B. It highlights safety concerns related to modifications involving larger tires such as the 29x11-10 size on the original Cleveland Wheel and Brake wheel part number 40-101. The bulletin emphasizes the need for FAA-approved data and inspections when installing these tires to ensure continued airworthiness.

What changed

This bulletin introduces recommendations for operators and owners of part 23 certificated airplanes to obtain supplemental type certificates or field approvals supported by FAA-approved data before installing oversized tires. It reiterates the importance of structural analysis, flight testing, and periodic inspections to prevent unsafe conditions associated with these modifications. The document also references FAA Advisory Circular AC 23-17B and Safety Alert for Operations SAFO 10007 for additional guidance.

Why it matters

Oversized tundra tires can affect aircraft ground clearance, brake system integrity, and flight handling characteristics, potentially leading to safety risks such as wheel failures and brake lockups. Aviation professionals, including operators and maintenance organizations, must understand these risks to maintain aircraft safety and compliance. Proper approval and inspection protocols help prevent accidents and ensure modifications do not compromise aircraft performance or structural integrity.