The STG-12TM (Series 3) is a DC starter-generator designed for use in aviation power systems.
It serves a dual purpose — functioning both as a starter for engine start and as a generator supplying electrical power to the onboard network once the engine is running.

The unit is typically installed on the accessory gearbox (upper gearbox) of helicopter or aircraft engines, where it is driven mechanically through a gear train.
The generator delivers a nominal output of 28.5 V DC and provides reliable power for avionics, control systems, and onboard equipment.
It is widely used on Mi-8, Mi-17, and related helicopter series, as well as other aircraft requiring a robust combined starter-generator system.

Type: DC starter-generator, dual operational mode (starter and generator)
Series: 3rd series, latest modification of the STG-12TM line
Nominal output voltage: 28.5 volts DC
Nominal load current: up to 400 amperes
Rated power output: 12 kilowatts
Rotational speed range: from 4,200 to 9,000 revolutions per minute
Dimensions: 229.5 millimeters in diameter and 504 millimeters in length
Weight: approximately 35.5 kilograms
Mounting position: installed on the engine accessory (upper) gearbox
Drive system: mechanical drive through the engine gear train
Cooling method: air-cooled, self-ventilated through housing vents
Excitation type: shunt-excited DC machine for stable output voltage
Operating modes: starter mode and generator mode, automatically switched depending on engine state
Standard operating voltage system: 28-volt DC onboard electrical network
Typical application: Mi-8 and Mi-17 helicopter power systems, as well as other aircraft using similar 28-V DC systems

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