8-1930-000 Series 2

Main rotor hub assembly 8-1930-000 Series 02

8-1930-000 Series 02 is a main rotor hub assembly used on Mi-8 family helicopters as a primary load-bearing unit of the main rotor system. The hub connects the main gearbox output with the rotor blade set and transmits torque to the blades during operation. It also supports the mechanical movement required for blade pitch control and rotor response in flight. The assembly works under continuous aerodynamic, centrifugal and inertial loads, so its condition directly affects rotor stability, vibration behavior and flight control reliability.

Torque transmission and blade control through 8-1930-000

The 8-1930-000 hub transfers rotational power from the main gearbox to the main rotor blades. At the same time, it allows control inputs from the helicopter control system to change blade pitch. This combination of power transmission and controlled blade movement makes the hub one of the central units of the rotor system. During takeoff, hover, climb, cruise, descent and landing, the hub must keep the blade set correctly positioned while allowing the required axial and angular movement. Any wear, incorrect assembly or damage in the hub can affect blade tracking, control response and vibration level.

8-1930-000 Series 02 load-bearing rotor structure

The 8-1930-000 Series 02 assembly includes the structural elements needed to carry and distribute rotor loads. The hub housing, upper and lower cones, axial hinge components, bearings, seals and fastening elements work together as a single rotating unit. The hub absorbs loads coming from the blades and transfers them into the rotor mast and transmission structure. Its design also includes damping and limitation elements that help control blade movement and reduce unwanted oscillations. Because of this, the hub is not just a mounting point for blades, but a complete mechanical system within the main rotor.

Hydraulic damping elements in the 8-1930-000 hub

The 8-1930-000 Series 02 hub uses hydraulic damping elements to control blade movement during operation. Hydraulic dampers, including the 8-1930-700A type where applicable, work with the compensation reservoir and related hydraulic components. These elements help absorb oscillatory movement and reduce loads transmitted through the blade hinges and hub structure. The damping system is important for rotor smoothness and for limiting dynamic stresses during changing flight modes. During maintenance, the condition of dampers, seals, oil areas and compensation elements should be checked together with the main hub assembly.

Blade flapping control in 8-1930-000 Series 02

The 8-1930-000 Series 02 hub incorporates mechanisms that limit blade flapping and support controlled blade movement in the rotor plane. These elements are required because the blades must move within permitted limits while the helicopter operates under changing aerodynamic and inertial conditions. The passport data references upward and downward blade flapping angles, as well as blade pitch positions for normal operation and autorotation-related modes. These values are part of the technical control of the hub and should be checked through the aircraft maintenance documentation and the individual passport of the assembly.

Identification and service documentation for 8-1930-000 Series 02

Before ordering or installing 8-1930-000 Series 02, the designation, series, passport, serial number and component history should be checked. The attached passport identifies the item as a main rotor hub, series 02, with an individual product number and acceptance records. Service life, overhaul intervals, storage status and preservation records are controlled through the passport and operational documentation. For supply or overhaul planning, it is useful to specify the helicopter type, required condition, passport availability, completeness of the assembly, hydraulic damper configuration and remaining resource.

Product Type: Main rotor hub assembly
Designation: 8-1930-000 Series 02
Alternative Designations: 8-1930-000 Ser. 02, 8-1930-000 Series 2, 8-1930-000 C.02
Passport Designation: 8-1930-000 PS
Passport Item Number: 2348C191
Function: Transmission of torque from main gearbox to rotor blades and blade pitch control
Application / Where Used: Mi-8 family helicopter main rotor systems
System / Installation Area: Main rotor system / rotor mast area
Compatible Aircraft / Equipment: Mi-8T, Mi-8MTV and other Mi-8 family helicopters, depending on aircraft documentation
Functional Role: Primary load-bearing unit of the main rotor system
Number of Blades: 5
Rotation Direction: Counterclockwise, viewed from the lower cone side of the hub
Damper Type: Hydraulic
Blade Flapping Angle, Upward: 25° ± 30′ from the plane perpendicular to the axis of rotation
Blade Flapping Angle, Downward: 4° ± 20′ from the plane perpendicular to the axis of rotation
Blade Pitch Angle at Central Stop: 14°40′ ± 20′
Blade Pitch Angle at Autorotation Stop: 4° ± 20′
Blade Rotation Angle Relative to Longitudinal Hinge, Direction of Rotation: 13° ± 15′
Blade Rotation Angle Relative to Longitudinal Hinge, Opposite Direction: 11° ± 10′
Mass, Filled with Oil and Greases: Not more than 607.5 kg
Mass, Passport Entry: 603 kg
Packed Mass: Not more than 940 kg
Package Dimensions: 2145 × 2120 × 670 mm
Assembly Composition: Upper cone, lower cone, hub housing, hydraulic damper compensation reservoir, hydraulic dampers, axial hinge components, bearings, seals, fastening and locking elements
Damping Elements: Hydraulic dampers, including type 8-1930-700A where applicable
Limitation Mechanisms: Centrifugal blade flapping limiter
Lubrication and Oils Used: TS-GIP, MS-20, AMG-10 and related lubricants according to passport and maintenance documentation
Time to First Overhaul: 1500 h
Time Between Overhaul: 1500 h
Assigned Resource: 6000 h
Assigned Service Life: 8 years
Storage Life in Preservation: 6 years
Preservation Period: 6 months
Condition: As applicable
Technical Documentation: Factory passport, operational documentation, overhaul documentation, storage and preservation records

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