865×280 Model 1A

Load absorption through 865×280 Model 1A

During ground operation, the tire absorbs part of the impact and vibration loads that occur when the aircraft moves over uneven surfaces or touches down during landing. It also supports stable rolling of the main landing gear wheels during taxiing and takeoff run. Correct pressure is critical for tire life and safe operation. Underinflation, overload or operation outside approved speed limits can increase heat buildup, damage the casing and reduce resistance to impact loads.

865×280 Model 1A on Mi-8 family helicopters

The tire is used on main landing gear wheels of Mi-8 family helicopters, including Mi-8, Mi-8MT, Mi-17, Mi-171 and Mi-172 configurations. It is also associated with Mi-9, Mi-19 and Il-14M aircraft applications where the same wheel size and load category are specified. Exact applicability depends on the wheel assembly, tube type, aircraft modification and maintenance documentation. A tire should not be selected only by outer size if the ply rating, pressure and approved aircraft type are not confirmed.

Construction of the 865×280 Model 1A tire

The tire has a rubber tread with longitudinal grooves and a tube-type carcass construction. The tread pattern is intended for straight-line rolling stability and water displacement on prepared surfaces. The carcass and bead area carry the operating load and hold the tire on the wheel rim under pressure. During inspection, maintenance personnel should check tread wear, sidewall cuts, bead condition, casing deformation, foreign object damage and any signs of overheating or pressure loss.

Identification and ordering of 865×280 Model 1A

Before ordering, the full designation should be checked against the aircraft parts catalog, wheel documentation and tire technical specification. The size alone may not be enough, because aircraft tires can differ by model, ply rating, pressure range and approved application. For correct selection, provide the aircraft type, wheel assembly, required tire model, tube requirement and any documentation reference. The product is also known under alternative designations 865×280, Model 1A and 865×280 1A aircraft tire.