KV-112

KV-112 ignition unit in the KO-50 heater system

The KV-112 is an aircraft ignition unit used in the start system of kerosene-fired heaters. Its job is to generate high-voltage ignition energy for the spark plug during heater start-up. In the KO-50 heater, the unit works at the moment when fuel and air must be ignited inside the combustion chamber. Without a stable spark, the heater may fail to start, enter an unstable mode, or shut down through the protection system. The KV-112 is therefore one of the key electrical units in the heater ignition chain.

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.

Product Type: Aircraft ignition unit
Designation: KV-112 / КВ-112
Function: Generation of high-voltage ignition energy for fuel-air mixture ignition
Application / Where Used: Aircraft heating and ignition systems
System / Installation Area: KO-50 kerosene heater ignition system; heater compartment
Associated Heater: KO-50 aircraft kerosene heater
Compatible Aircraft / Equipment: Mi-8 / Mi-17 family helicopters and similar aircraft platforms using KO-50 or related heater systems
Associated Spark Plug: SD-96 ignition spark plug, depending on heater configuration
Power Supply System: Two-wire
Power Supply: 27 V DC from aircraft battery; parallel generator connection permitted according to aircraft electrical system configuration
Operating Voltage Range: 27 V DC ±10%
Current Consumption: Not more than 1.2 A
Ignition Function: High-voltage supply to ignition spark plug during heater start-up
Installation Location: Heater compartment / heater installation area depending on aircraft layout
Weight: Not more than 2.0 kg
Service Life: Assigned service life according to product passport
Storage Life: 1 year under manufacturer storage conditions
Condition: As applicable
Technical Documentation: Manufacturer passport and technical documentation available upon request

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.