KT97-220-1

KT97-220-1 brake assembly in the main landing gear

The KT97-220-1 is an aircraft wheel brake assembly used in the main landing gear braking system of Mi-8, Mi-17, Mi-171 and related helicopter versions. The unit is installed inside the KT97-310 brake wheel and provides braking force during landing rollout, taxiing, parking and ground handling. It works as part of the helicopter pneumatic brake system, where compressed air from the onboard pneumatic circuit is used to actuate the brake mechanism. The brake assembly is one of the key components that allows the crew to control wheel braking after touchdown and during movement on the ground.

Braking function of KT97-220-1 on Mi-8 helicopters

During ground operation, the KT97-220-1 helps slow the helicopter, hold it in position and control movement on the airfield or landing site. The brake is especially important after landing, when the main wheels need controlled deceleration, and during taxiing, when the crew may need short, precise brake inputs. On heavier helicopters such as the Mi-8 / Mi-17 family, the brake must handle high dynamic loads and repeated heating cycles. A weak, leaking or incorrectly adjusted brake assembly can affect stopping distance, parking hold and directional control on the ground.

KT97-220-1 inside the KT97-310 wheel

The KT97-220-1 is designed to work with the KT97-310 main brake wheel. It is mounted inside the wheel drum and matched to the geometry of the main landing gear axle and brake flange. The brake assembly is used with the 865 × 280 tube-type aircraft tire installed on the corresponding wheel. This fit is important because the brake shoes, drum, mounting flange and air supply connection must all align with the approved landing gear configuration. The unit should not be selected only by general wheel size or aircraft type; the full brake and wheel designation must be checked.

Pneumatic actuation of the KT97-220-1 brake

The KT97-220-1 is a pneumatic shoe-type brake. When the crew applies the brake, compressed air is supplied from the helicopter pneumatic system into the brake actuator chamber. The textile-rubber brake bladder expands and presses the friction shoes against the inner surface of the rotating wheel drum. This creates braking force. When air pressure is released, the brake shoes return from the drum and the wheel can rotate freely again. The system is simple, but its reliability depends on clean air, correct pressure, good sealing and proper condition of the friction elements.

Side execution and KT97-220-1 / KT97-220-2 difference

The KT97-220-1 is one execution of the brake assembly, while KT97-220-2 is the corresponding opposite-side or mirrored version, depending on production series and air-line arrangement. This distinction matters during ordering and installation. The two assemblies may be similar in function, but they can differ by air connection direction, mounting orientation or side application. For a maintenance request, it is better to specify the complete designation, the side of installation if known, the wheel type KT97-310, and the helicopter modification. This helps avoid receiving the wrong brake execution.

Wear items and service checks for KT97-220-1

The KT97-220-1 includes friction elements and an actuating mechanism that should be checked during maintenance. The most important inspection points are brake shoe wear, condition of heat-resistant linings, actuator bladder integrity, sealing, air connection condition, mounting surfaces and signs of overheating or uneven contact inside the drum. Since the brake works in a pneumatic system, contamination or moisture in the compressed air can also affect service life. If the brake response is weak, uneven or delayed, the fault may be in the brake assembly itself, but also in the air supply, reducing valve, lines or control mechanism.

Supply, resource and documentation for KT97-220-1

The KT97-220-1 is aircraft technical equipment and is normally supplied with passport or manufacturer documentation. For installation, the documentation should confirm designation, condition, acceptance, storage or repair status, and resource limits. The assembly may be supplied individually or as part of a wheel-and-brake set, depending on the order. When buying for service use, it is important to clarify whether the part is new, first-category from storage, repaired, overhauled or supplied with friction elements installed. For aircraft operation, the brake must be matched with the KT97-310 wheel and the applicable Mi-8 / Mi-17 maintenance documentation.

Product Type: Aircraft wheel brake assembly
Designation: KT97-220-1
Drawing / Product Number: KT97.220-1
Alternative Designations: KT97-220-1; KT97-220-01
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
Typical Installation: Inside the KT97-310 main brake wheel
Side / Execution: KT97-220-1 execution; opposite or mirrored version — KT97-220-2 depending on series and air-line arrangement
Compatible Aircraft / Equipment: Mi-8T, Mi-8MT, Mi-8MTV-1, Mi-17, Mi-171, Mi-172 depending on landing gear configuration
Associated Wheel: KT97-310 main brake wheel
Associated Tire Size: 865 × 280 tube-type pneumatic aircraft tire
Brake Type: Pneumatic shoe-type brake
Actuation Medium: Clean compressed air from the onboard pneumatic system
Nominal Working Pressure: 0.31 ±0.03 MPa / 3.1 ±0.3 kgf/cm²
Maximum Test / System Check Pressure: Up to 0.45 MPa / 4.5 kgf/cm²
Actuating Element: Ring-type textile-rubber brake bladder / chamber
Friction Elements: Replaceable brake shoes with heat-resistant friction linings
Mounting: On the axle flange of the main landing gear shock strut
Climatic Suitability: Suitable for operation in all climatic conditions
Assigned Resource: Up to 600 takeoff-landing cycles, depending on production series and manufacturer bulletins
Calendar Service Life: Up to 28 years, subject to inspections, overhaul and applicable documentation
Warranty Period: 6 years from entry into service within assigned resource limits
Scope of Supply: Brake assembly with friction elements and actuating mechanism, depending on order
Technical Documentation: Product passport / manufacturer documentation

All shipments are carried out from our international warehouse in Dubai (UAE), as well as from our partners’ remote warehouses.

In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.

Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.

Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.

Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

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.