KT97-220-2

KT97-220-2 brake assembly in the main landing gear

The KT97-220-2 is an aircraft wheel brake assembly used in the main landing gear braking system of Mi-8, Mi-17, Mi-171 and related helicopter modifications. The unit is installed inside the KT97-310 main brake wheel and provides braking during landing rollout, taxiing, parking and ground maneuvering. In the landing gear system, this brake is one of the working units that turns pneumatic control pressure into braking force at the wheel. Its correct operation directly affects ground handling, stopping performance and the ability to hold the helicopter in position.

Braking role of KT97-220-2 during ground operation

During landing and taxiing, the KT97-220-2 helps the crew control wheel rotation and reduce helicopter speed after touchdown. It also supports parking and short brake applications during ground maneuvering. On Mi-8 family helicopters, the brake system has to work under high aircraft weight, repeated load cycles and changing runway conditions. If the brake assembly is worn, leaking, incorrectly adjusted or installed on the wrong side, braking may become weak, delayed or uneven. This is why the unit must be matched to the exact wheel, side and pneumatic control layout.

KT97-220-2 installation inside the KT97-310 wheel

The KT97-220-2 is designed for installation inside the KT97-310 main landing gear brake wheel. The brake geometry is matched to the wheel drum, main landing gear axle and air supply connection. The associated wheel uses an 865 × 280 aircraft tire. Mounting is linked to the axle flange of the main landing gear shock strut, so the brake cannot be selected by aircraft type alone. Before installation, the brake assembly must be checked against the wheel designation, landing gear configuration and helicopter maintenance documentation.

Pneumatic control of the KT97-220-2 brake

The KT97-220-2 operates from the helicopter onboard pneumatic system. Control air is supplied through the brake system, including reducing and accelerating components depending on the helicopter configuration. When pressure reaches the brake assembly, the actuating elements apply force to the friction group and create braking at the wheel. When pressure is released, the brake should return without dragging. Stable operation depends on clean compressed air, correct pressure adjustment, reliable hose connections, serviceable seals and proper condition of the friction parts.

KT97-220-2 and the opposite-side brake execution

The KT97-220-2 is normally supplied as one of the paired brake executions used together with KT97-220-1. These two units may correspond to left and right installation or to different pneumatic line orientation depending on production series and aircraft documentation. The difference is not cosmetic. The direction of air supply, mounting orientation and side assignment can matter during installation. For procurement, the full designation KT97-220-2 or KT97-220-02 should be stated, together with the wheel type KT97-310 and the required side if confirmed by the customer’s documentation.

Friction group and service checks of KT97-220-2

The KT97-220-2 includes the housing, actuating parts and friction elements. Depending on execution, the brake may be described with brake cylinder blocks and replaceable friction components, including metal-ceramic elements. In service, the friction group is inspected for wear, overheating, cracks, uneven contact and remaining thickness. The pneumatic actuator is checked for leakage, correct response and ability to release fully after braking. If the wheel heats up after taxiing or the helicopter pulls to one side under braking, the brake assembly and pneumatic supply line should be checked together.

Supply, resource and documentation for KT97-220-2

The KT97-220-2 is aircraft technical equipment and should be supplied with passport or manufacturer documentation. The brake may be supplied as a single unit, as a left / right pair, or together with the KT97-310 wheel depending on the order. For aircraft installation, documents should confirm designation, category, storage or repair condition, acceptance status and remaining limits. Since the brake has a landing-cycle resource and calendar service life, it should not be accepted for installation only by external appearance. Passport data and maintenance status are part of the product’s real value.

Product Type: Aircraft wheel brake assembly
Designation: KT97-220-2
Alternative Designations: KT97-220-2; KT97-220-02
Function: Braking of landing gear wheels during ground operations
Application / Where Used: Helicopter landing gear braking systems
System / Installation Area: Main landing gear wheel brake system, right-side execution depending on documentation
Typical Installation: Inside the KT97-310 main brake wheel
Associated Wheel: KT97-310 main landing gear brake wheel
Associated Tire Size: 865 × 280 aircraft pneumatic tire
Tire Model / Execution: 865 × 280, model 1A according to supplied technical description
Compatible Aircraft / Equipment: Mi-8T, Mi-8MT, Mi-8MTV-1, Mi-17, Mi-171 and related modifications depending on landing gear configuration
Opposite / Paired Brake: KT97-220-1 depending on side and pneumatic line arrangement
Brake Type: Pneumatic wheel brake assembly; disc / multi-disc execution according to supplied technical description
Friction Elements: Replaceable friction elements, including metal-ceramic brake elements depending on execution
Actuation Medium: Clean compressed air from the onboard pneumatic system
Control Drive: Pneumatic control through brake system units, including UP-03/2M reducing accelerator and PU-7N pressure-reducing valve depending on configuration
Nominal Brake Air Pressure: 11–13 kgf/cm² according to supplied technical description
Wheel Tire Charging Pressure: 5.5–6.0 kgf/cm²
Outer Diameter of Brake Unit: 480 mm
Inner Mounting Diameter for Axle: 80 mm
Maximum Landing Speed: 192 km/h
Permissible Static Load: Up to 4100 kgf per wheel
Climatic Suitability: Suitable for operation in all climatic conditions
Assigned Resource: 600 takeoff-landing cycles
Calendar Service Life: Up to 28 years, subject to scheduled maintenance and documentation status
Scope of Supply: Brake assembly with friction elements and actuating mechanism, depending on order
Technical Documentation: Product passport / manufacturer documentation

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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.