EPK-2T-90

EPK-2T-90 windshield wiper drive mechanism

EPK-2T-90 is an aircraft electromechanical windshield wiper drive mechanism used in cockpit glazing cleaning systems of helicopters and aircraft. The unit drives the wiper arm and brush, providing mechanical cleaning of the forward cockpit windows from water, dirt, snow and other contamination during flight, taxiing and ground operation. It is used on Mi-8 / Mi-17 / Mi-171 family helicopters and on some transport aircraft, depending on the installed windshield wiper system and aircraft documentation.

Windshield cleaning function of EPK-2T-90

The EPK-2T-90 converts 27 V DC electrical power into oscillating movement of the windshield wiper brush. The mechanism moves the output shaft through a limited angular sector, and the attached arm transfers this movement to the wiper blade. This allows the brush to clean the pilot’s forward glazing and maintain visibility in precipitation or wet contamination. The drive must operate evenly, without jamming, irregular movement or excessive play. Brush pressure, arm length, sweep angle and electrical supply condition all affect the quality of windshield cleaning.

EPK-2T-90 construction with D-70T motor

The EPK-2T-90 includes a D-70T DC electric motor, a two-stage planetary reduction gear and a crank-rocker mechanism. The motor produces rotation, while the reduction gear lowers speed and increases torque. The crank-rocker mechanism then converts continuous shaft rotation into reciprocating movement of the wiper brush. This arrangement allows the mechanism to provide stable sweep movement within the required angular range. The unit is installed close to the cockpit windshield, so the drive housing, shaft seal, mounting points and external wiper linkage should be checked during maintenance.

Automatic return and reset mode of EPK-2T-90

The EPK-2T-90 has a built-in interrupter for automatic return and stopping of the brush in the end parked position. When the system is switched to reset mode, the mechanism returns the wiper to its initial position outside the main crew field of view. The stop is performed through the dynamic braking circuit, which helps fix the brush in the required end position. This function is important because a wiper blade left in the central viewing area can interfere with visibility. Correct reset operation should be checked together with motor performance and switch circuits.

Installation of EPK-2T-90 on Mi-8 / Mi-17 helicopters

On Mi-8 / Mi-17 / Mi-171 helicopters, EPK-2T-90 mechanisms are installed in the pilots’ cockpit, normally above the forward heated windshields on the cockpit canopy frame. The mechanism body is mounted inside the cockpit, while the output shaft passes through the structure to the outside, where the drive arm and wiper brush are attached. The system is usually installed in pairs: one mechanism for the left windshield of the captain and one for the right windshield of the second pilot. Control switches are placed on the cockpit electrical panels.

Identification and ordering of EPK-2T-90

Before ordering EPK-2T-90, the aircraft type, installation side, required condition and documentation set should be confirmed. The mechanism may be required for operational replacement, repair stock or overhaul support of the windshield cleaning system. It is also useful to confirm the arm length, sweep angle, connector configuration, control switch wiring and whether interchangeability with other EPK-2T versions is required. For acceptance, the buyer should clarify passport availability, serviceability records, repair status and installation documentation.

Product Type: Aircraft windshield wiper drive mechanism / electromechanical actuator
Designation: EPK-2T-90
Alternative Designations: ЭПК-2Т-90, EPK2T-90, ЭПК2Т-90
Function: Drive of windshield wiper brush and automatic return to parked position
Application / Where Used: Aircraft and helicopter windshield wiper systems
System / Installation Area: Cockpit windshield cleaning system
Compatible Aircraft / Equipment: Mi-8, Mi-17, Mi-171 helicopters and other aircraft according to applicable documentation
Installation Location: Inside cockpit above forward windshield, mounted on cockpit canopy frame structure
Installation Configuration: Left and right cockpit windshield wiper drives, depending on aircraft installation
Motor Type: D-70T DC electric motor
Transmission Design: Two-stage planetary reduction gear with crank-rocker mechanism
Automatic Return: Built-in reset / parked-position return mechanism
Braking Function: Dynamic braking circuit in reset mode
Power Supply: 27 V DC ±10%
Current Consumption: Not more than 2.6 A at first working speed; up to 3 A under full load
Output Shaft Sweep Angle: 50°–65°
Brush Pressure on Glass: 1.6–2.0 kgf
Recommended Drive Arm Length: 420 ±10 mm
Operating Modes: Start mode, first speed, second speed, reset / return mode
Start Mode Speed: Up to 145 double strokes per minute, continuous operation not more than 5 minutes
First Working Speed: 64–90 double strokes per minute
Second Working Speed: 38–60 double strokes per minute
Control Protection: AZSGK-10 windshield wiper circuit breakers, depending on aircraft installation
Condition: As applicable
Technical Documentation: Product passport, aircraft maintenance documentation, wiring diagram and installation documentation if available

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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.