8-1950-000

Collective and cyclic pitch control through 8-1950-000

The 8-1950-000 assembly changes the pitch of the main rotor blades in two ways. Collective movement changes the pitch of all blades together, which affects lift and allows the helicopter to climb, descend or maintain hover. Cyclic movement changes blade pitch depending on the blade’s azimuth position during rotation, which allows the rotor disc to tilt and the helicopter to maneuver. The swash plate must transmit these inputs smoothly and accurately, because any play, binding, bearing wear or incorrect adjustment can affect control response and rotor stability.

8-1950-000 between stationary and rotating control systems

The 8-1950-000 swash plate assembly includes stationary and rotating components connected through bearings. The stationary part receives motion from the flight control system and hydraulic boosters, while the rotating part follows the main rotor rotation and transmits movement to the blade pitch links. This arrangement allows non-rotating cockpit commands to be passed into the rotating rotor head. The assembly must maintain correct geometry while operating under continuous rotation, vibration and changing aerodynamic loads. For this reason, bearing condition, lubrication, slider movement and pitch link guide condition are important during inspection.

Construction of the 8-1950-000 swash plate mechanism

The 8-1950-000 assembly consists of a rotating plate, stationary plate, bearing elements, pitch link guides and a linear slider. These parts work together to provide axial movement and tilting of the swash plate according to pilot inputs. The slider travel and tilt limits define the permitted control movement range of the assembly. Since the mechanism is connected directly with main rotor blade pitch control, its adjustment must correspond to aircraft maintenance documentation. Incorrect installation or deviation from permitted movement limits may affect blade incidence, control range and flight safety.

Application of 8-1950-000 on Mi-series helicopters

The 8-1950-000 swash plate assembly is used on Mi-8, Mi-17, Mi-171 and corresponding modifications equipped with compatible main rotor control systems. It operates as part of the primary flight control system and main rotor pitch-control transmission. Because helicopters may differ by modification, overhaul history, control system configuration and service bulletin status, applicability should be confirmed by the aircraft parts catalog and technical documentation before ordering or installation. A visually similar swash plate should not be treated as interchangeable without confirming the exact designation and approved configuration.

Identification and ordering of 8-1950-000

The assembly may be referenced under designations 8-1950-000, 8-1950-000 PS and 81950000. These references relate to the same swash plate assembly, but the passport designation, condition and documentation set should still be confirmed before supply. For correct ordering, it is useful to specify the helicopter type, required condition, passport availability, overhaul status, completeness and whether the unit is needed for operational replacement, overhaul stock or repair support. Since the swash plate is a flight-control component, traceable documentation and maintenance records are important for acceptance.