865×280 Model 1A

865×280 Model 1A tire for aircraft landing gear

The 865×280 Model 1A is an aircraft pneumatic tire used as part of the landing gear wheel assembly. It provides ground contact between the aircraft and the surface during taxiing, takeoff, landing and ground handling. The tire works as the main elastic element of the wheel, carrying vertical load and reducing vibration transmitted from the runway or landing area to the landing gear structure. It is a tube-type tire and must be used with compatible wheel and tube components according to the aircraft documentation.

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.

Product Type: Aircraft tire
Function: Ground contact, load absorption, vibration damping
Application / Where Used: Aircraft landing gear wheel assemblies
System / Installation Area: Main landing gear wheels
Compatible Aircraft / Equipment: Mi-8, Mi-8MT, Mi-17, Mi-171, Mi-172, Mi-9, Mi-19, Il-14M
Tire Construction: Tube-type
Ply Rating: 14
Tread Type: Rubber tread with longitudinal grooves
Bead Seat Diameter: 429 mm
Overall Dimensions: 865 × 865 × 280 mm
Weight: Not more than 28.7 kg
Operating Pressure, No Load: 0.54–0.64 MPa
Proof Pressure: Not less than 2.55 MPa
Maximum Static Load, Takeoff: 39,730–50,180 N
Maximum Static Load, Landing: 37,770 N
Maximum Takeoff Speed: 160 km/h
Maximum Touchdown Speed: 155 km/h
Maximum Autorotation Speed: 70–90 km/h
Assigned Service Life: 10 years
Technical Documentation: TU 38.404276-94

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Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.