56-1400-00 (56.1400.00)

Main rotor brake 56-1400-00 in the helicopter transmission system

56-1400-00 is a mechanical main rotor brake used in the transmission system of Mi-series helicopters. The unit is intended to reduce main rotor run-down time after engine shutdown and support safe ground handling after flight. Without a rotor brake, the main rotor continues rotating for a longer period because of the high inertia of the rotor system. The 56-1400-00 provides controlled braking action after shutdown, allowing maintenance personnel and ground crew to approach the helicopter sooner and work around the aircraft under safer conditions.

Controlled rotor deceleration through 56-1400-00

The 56-1400-00 brake performs controlled deceleration of the main rotor system. Its function is not to stop the rotor during normal powered flight, but to brake the rotor after the engines have been shut down and the transmission is no longer driving the rotor in flight mode. The brake must operate against high rotating mass and absorb mechanical energy during the stopping process. Because the rotor system has significant inertia, braking must be stable and predictable. Excessive wear, incorrect adjustment or damage inside the brake mechanism can affect stopping performance and may lead to abnormal vibration, noise or overheating.

56-1400-00 in Mi-8 / Mi-17 / Mi-171 applications

The 56-1400-00 main rotor brake is applied on Mi-8, Mi-17 and Mi-171 helicopters, where it works as part of the transmission and rotor braking system. These helicopters use a large main rotor with considerable stored rotational energy, so a dedicated braking unit is required for post-flight operations. Applicability still needs to be checked against the aircraft parts catalog and the installed transmission configuration. This is especially important for aircraft after overhaul, modernization or replacement of transmission-related assemblies, where the actual configuration may differ from a basic model reference.

Integration of 56-1400-00 with rotor brake mechanisms

The 56-1400-00 is integrated into the helicopter rotor brake mechanism and operates in the transmission area. It works with the mechanical linkage, control elements, mounting points and related transmission interfaces specified by aircraft documentation. The brake must remain secure under vibration, shock loads and changing ground operating conditions. During maintenance, the unit is normally inspected together with its attachment points, friction surfaces, actuation components, adjustment condition and signs of overheating or mechanical damage. Correct installation and adjustment are important because the brake works directly with a high-inertia rotating system.

Operating environment of the 56-1400-00 brake unit

The 56-1400-00 operates in a helicopter environment where vibration, shock, temperature variation and cyclic mechanical loads are expected. The unit must withstand repeated braking cycles after flight and ground operation. Its condition affects not only rotor stopping time, but also the practical safety of servicing around the helicopter. Wear of friction elements, contamination, incorrect clearance, damaged hardware or poor actuation can reduce braking efficiency. For this reason, the rotor brake should be checked according to the maintenance schedule and after any abnormal braking event or unusual noise during rotor stopping.

Identification and supply of 56-1400-00

Before ordering 56-1400-00, the designation should be confirmed against the aircraft documentation, transmission system configuration and required condition. The unit may be supplied as new, overhauled or repaired, depending on availability and customer requirements. Documentation, warranty terms and service status should be clarified before shipment, especially for operators and MRO organizations that need traceable components. For correct supply, it is useful to specify the helicopter type, required condition, documentation set, warranty requirement and whether the brake is needed for operational replacement, overhaul stock or repair support.

Product Type: Main rotor brake
Designation: 56-1400-00
Alternative Designations: 56140000, 56.1400.00
Function: Rapid stopping of main rotor after engine shutdown
Application / Where Used: Helicopter transmission and rotor brake systems
System / Installation Area: Transmission system and rotor brake mechanism
Compatible Aircraft / Equipment: Mi-8, Mi-17, Mi-171 helicopters
Construction: Mechanical brake unit for high inertial and vibration loads
Operating Conditions: High vibration and shock helicopter environments
Operating Role: Controlled main rotor deceleration during post-shutdown ground operation
Condition: New, overhauled or repaired, depending on availability
Warranty: Available depending on condition and supply terms
Logistics: International supply for operators and MRO organizations
Technical Documentation: Operational documentation supplied, aircraft parts catalog, maintenance documentation

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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.