EMT-244

EMT-244 electromagnet in anti-icing control systems

The EMT-244, including the EMT-244A modification, is an aircraft DC push-type plunger electromagnet. It is used as a small actuator in anti-icing systems of Soviet and Russian helicopter powerplants. The unit receives power from the onboard DC network and extends its plunger to move the linked part of the valve mechanism. It is not a control unit by itself. In the system, it works as the electromechanical element that physically acts on the air valve or spool.

Anti-icing valve operation through EMT-244

In helicopter anti-icing systems, the EMT-244 controls the air spool of the anti-icing valve. When voltage is applied, the electromagnet extends the rod and opens the valve for hot air bleed from the engine compressor. This hot air is then directed to heat the inlet guide vanes and engine air intake areas. The task of the electromagnet is simple but specific: it gives the valve the initial mechanical movement needed for switching the anti-icing air path.

EMT-244 in Mi-8, Mi-17 and Mi-24 installations

The EMT-244 / EMT-244A is associated with Mi-8 and Mi-17 helicopter installations, including engines of the TV2-117 and TV3-117 families, depending on aircraft version. In such systems, one actuator may be installed for each engine anti-icing valve. The unit is also known from Mi-24 powerplant control assemblies and earlier Mi-2 applications. The exact installation must be checked by aircraft type, engine version and anti-icing system diagram.

System links around EMT-244A

The electromagnet works with cockpit anti-icing controls, onboard DC wiring, relays, the anti-icing valve body, air spool, rods and return elements of the mechanism. If the valve does not open, the fault is not always inside the electromagnet. The cause may be missing power, a wiring fault, a sticking valve, incorrect adjustment, or mechanical resistance in the linked part. For this reason, troubleshooting normally includes both electrical and mechanical checks.

Identification and ordering of EMT-244

Before ordering EMT-244 or EMT-244A, the marking should be compared with the aircraft parts catalog, engine system documentation or repair records. The EMT-244 family includes several modifications, including EMT-244A through EMT-244D, so the exact version matters. Externally similar units may not always match the required installation. The product is also known under alternative designations EMT-244, EMT-244A, ЭМТ-244 and ЭМТ-244А.

Product Type: DC push-type plunger electromagnet
Function: Mechanical actuation of anti-icing air valve / air spool
Application / Where Used: Helicopter engine anti-icing systems and powerplant control assemblies
System / Installation Area: Anti-icing valve control circuit, engine air intake and compressor bleed air system
Compatible Aircraft / Equipment: Mi-8 / Mi-17 series, Mi-24, Mi-2 applications depending on modification
Associated Engines: TV2-117, TV3-117 applications depending on helicopter version
Operating Voltage: 27 V DC
Current Consumption: 2 A
Action Type: Push-type, plunger type
Basic Modifications: EMT-244A to EMT-244D
Technical Standard: TU 6B3.254.005TU
Technical Documentation: Aircraft and engine system documentation; product passport and technical specifications

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