KV-112

KV-112 and fuel-air mixture ignition

During start-up, the heater automation supplies fuel and air to the combustion zone, while the KV-112 sends high-voltage pulses to the ignition spark plug. The spark plug then ignites the fuel-air mixture. Once combustion becomes stable, the heater control system continues the operating sequence according to its own logic. The ignition unit does not regulate fuel or airflow; it only provides the electrical energy needed for the initial ignition. In maintenance, this distinction matters because poor heater start can be caused by the ignition unit, the spark plug, fuel supply, fan airflow, or control circuit.

Use of KV-112 with the KO-50 heater

The KV-112 is mainly associated with the KO-50 kerosene heater used on Mi-8 / Mi-17 family helicopters and similar aircraft heating systems. In this application, it works together with the SD-96 ignition spark plug and the heater’s fuel and air systems. The unit is installed in the heater compartment or near the heater installation area, depending on the aircraft layout. Its connection must be checked against the KO-50 wiring diagram and aircraft maintenance documentation, because the ignition circuit is part of the complete start and protection sequence.

Power supply and electrical layout of KV-112

The KV-112 operates from the aircraft DC electrical network. The unit uses a two-wire power supply system and is powered from the onboard battery, with parallel generator connection permitted according to the aircraft electrical configuration. During start-up, it must receive proper voltage and maintain stable high-voltage output to the spark plug. If the supply voltage drops, wiring resistance is high, or contacts are poor, the spark may become weak even if the ignition unit itself is serviceable. For that reason, troubleshooting should include both the unit and the supply circuit.

Installation and service checks for KV-112

The KV-112 is a compact electrical unit, but it works in a demanding area near heater equipment. During inspection, technicians normally check the housing, connector, wiring, insulation condition, mounting, and signs of overheating or moisture exposure. The high-voltage output path should also be checked carefully, since cracks, contamination, or poor insulation can cause leakage and weak spark at the plug. A heater that has fuel and airflow but does not ignite reliably should be checked through the full ignition chain, not only by replacing the spark plug.

Supply and identification of KV-112

For procurement or replacement, the full designation KV-112 / КВ-112 should be used. The unit may be supplied separately as a spare part or as part of a KO-50 heater assembly, depending on stock and order conditions. Before installation, it should be verified by passport, storage condition, service life, electrical compatibility, and connection with the required spark plug. It is also useful to specify whether the unit is needed for repair stock, overhaul of the heater, or immediate installation on an aircraft.

Related system equipment: KO-50, 748A, 610200A, 2416-4. These positions are grouped by system function and installation context, not as interchangeable replacements.

Confirmed installation context includes Mi-8 / Mi-17 family helicopters. The exact execution and installation position must be checked against the illustrated parts catalogue and documentation for the specific aircraft.