TER-1M

TER-1M temperature regulator for cockpit windshield heating

TER-1M is an aircraft temperature regulator used for automatic control of electric heating in pilot cockpit glazing. The unit switches windshield heating circuits on and off to maintain the required glass temperature and reduce the risk of icing or fogging. It is used in aircraft anti-icing and heating systems, including applications on Mi-8 / Mi-17 family helicopters. The regulator works with a temperature sensor installed on the glass and with switching equipment that controls the heating power supply.

Automatic glass heating control through TER-1M

The TER-1M monitors the temperature condition of the heated glass through a connected resistance temperature sensor. When the glass temperature changes, the sensor resistance changes accordingly. The regulator processes this resistance value and, when the threshold is reached, sends a control signal to the magnetic contactor. The contactor then switches the heating circuit. This allows the system to maintain windshield temperature within the required range without constant manual switching by the crew. Stable operation of the regulator helps preserve visibility and reduce thermal stress on the glass.

TER-1M with TD-2 temperature sensor

The TER-1M operates together with a wire-type temperature sensor, such as TD-2, installed directly on the heated glass surface. The TD-2 sensor provides the temperature-dependent resistance input used by the regulator. The regulator does not heat the glass by itself; it controls the electrical switching of the heating circuit through associated contactors. Because the regulator depends on sensor accuracy and wiring condition, troubleshooting should include the TER-1M unit, TD-2 sensor, connector contacts, wiring harness, magnetic contactor and heating element circuit.

Installation of TER-1M in Mi-8 / Mi-17 cockpit equipment

On Mi-8 / Mi-17 type helicopters, TER-1M regulators are installed in the cockpit area, normally on equipment shelves behind the pilots’ seats, in the area of fuselage frames 4N–5N. Two regulators may be installed for the left and right heated cockpit glass panels. They operate as part of the windshield anti-icing system together with magnetic contactors and related electrical equipment, including the AT-8-3 autotransformer where applicable. Installation inside the cockpit protects the electronic unit from direct external environmental exposure and allows replacement during maintenance.

Construction and electrical integration of TER-1M

The TER-1M is a compact monoblock device in a screened metal housing with an aircraft electrical connector. It is integrated into the aircraft 27 V DC onboard electrical system and controls the heating circuit through associated switching devices. The unit is intended for operation in aircraft electrical equipment compartments and cockpit-mounted avionics areas. Its connector-based installation allows the regulator to be removed and replaced during service. During inspection, technicians normally check housing condition, connector pins, wiring continuity, sensor circuit resistance and contactor response.

Identification and ordering of TER-1M

Before ordering TER-1M, the aircraft type, glass heating circuit, sensor type, required condition and documentation set should be confirmed. If the unit is required for a Mi-8 / Mi-17 windshield heating system, it is useful to specify whether it is for the left or right heated glass circuit and whether the associated TD-2 sensor, magnetic contactor or AT-8-3 equipment is also required. For acceptance, the buyer should clarify the availability of product passport, test records, connector configuration and serviceability documentation.

Product Type: Aircraft temperature regulator
Designation: TER-1M
Alternative Designations: ТЭР-1М, TER1M, ТЭР1М
Function: Automatic switching control of cockpit glass electric heating
Application / Where Used: Cockpit glazing heating and anti-icing systems
System / Installation Area: Windshield heating system, cockpit electrical equipment shelves
Compatible Aircraft / Equipment: Mi-8 / Mi-17 family helicopters and other aircraft according to applicable documentation
Associated Sensor: TD-2 wire-type platinum temperature sensor
Associated Equipment: Magnetic contactor; AT-8-3 autotransformer where applicable
Power Supply: 27 V DC ±10%
Temperature Regulation Range: +20 °C to +45 °C
Controlled Resistance Range: 132 to 150 Ohm
Dead Zone / Hysteresis: Not more than 2 Ohm across the regulation range
TD-2 Sensor Nominal Resistance: 136.5 ± 2.5 Ohm at +20 °C
Installation Location Reference: Cockpit equipment shelves behind pilots’ seats, frames 4N–5N area on Mi-8 / Mi-17 type helicopters
Housing: Compact screened metal housing with aircraft plug connector
Weight: 0.250 kg
Condition: As applicable
Technical Documentation: Product passport, aircraft maintenance documentation, wiring diagram and connector pinout if available

All shipments are carried out from our international warehouse in Dubai (UAE), as well as from our partners’ remote warehouses.

In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.

Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.

Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.

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.