SKNA-22-2A

Aircraft ignition unit SKNA-22-2A

SKNA-22-2A is an aircraft ignition unit used in gas turbine engine starting systems. Its job is to convert onboard DC power into high-voltage ignition pulses for semiconductor surface-discharge spark plugs. The unit is part of the ignition circuit, not a standalone start system. It works with aircraft power supply, start control circuits, high-voltage wiring and ignition plugs installed in the engine combustion area. In maintenance documents it is usually treated as one of the main electrical units of the engine ignition system.

High-voltage discharge from SKNA-22-2A

During start, SKNA-22-2A receives power from the aircraft DC network and charges its internal storage elements. The stored energy is then discharged through the high-voltage output to the spark plug. This creates a surface discharge on the semiconductor plug and ignites the fuel-air mixture in the combustion chamber. The unit is built for short-time operation during start, so continuous energizing outside the specified mode should be avoided. If ignition is unstable, the plug, high-voltage cable, connector and control circuit should be checked together with the unit.

SKNA-22-2A with semiconductor spark plugs

The SKNA-22-2A is intended for ignition systems using semiconductor surface-discharge spark plugs. This type of plug needs a strong pulse across its working surface, rather than a simple low-energy spark. The ignition unit, plug and cable form one working chain. A mismatch between the unit and plug type can cause weak discharge, poor start or accelerated wear of components. For replacement work, the installed plug type and engine documentation should be checked before confirming the SKNA-22-2A as a direct substitute.

Construction of the SKNA-22-2A unit

The unit is built in a metal enclosure and contains induction coils, selenium rectifiers, storage capacitors, activators and arresters. These components form the charging and discharge circuit for the high-voltage pulse. The metal housing protects the internal elements and provides a fixed installation base in the aircraft or engine equipment area. Because the unit operates with high voltage, attention during inspection should go to insulation condition, connector cleanliness, grounding, cable shielding and any signs of overheating or moisture ingress.

Identification and ordering of SKNA-22-2A

Before ordering SKNA-22-2A, the marking should be compared with the aircraft parts catalog, engine ignition documentation or product passport. Similar ignition units may look close externally but differ by discharge frequency, connector arrangement, plug compatibility or approved application. For correct selection, provide the aircraft type, engine type, ignition plug type, existing unit marking and a photo of the data plate if possible. The product is also known under alternative designations SKNA-22-2A and СКНА-22-2А.

Product Type: Aircraft ignition unit
Function: Conversion of onboard voltage and generation of high-voltage ignition pulses
Application / Where Used: Gas turbine engine ignition systems
System / Installation Area: Engine ignition system
Compatible Equipment: Systems using semiconductor surface-discharge spark plugs
Operating Voltage: 27 ±1 V DC
Stored Energy: 2 J
Discharge Frequency: 620 discharges/s
Current Consumption: 4.5 ±1 A
Output Voltage: ≥ 7 kV amplitude
Operating Mode: Short-time operation
Operating Temperature Range: −60 to +80 °C; up to +120 °C in non-operating condition
Service Life: 1500–800 h / up to 14 years, depending on application
Dimensions: 310 × 175 × 112 mm
Weight: ≤ 6.5 kg
Construction: Induction coils; selenium rectifiers; storage capacitors; activators; arresters in metal housing
Technical Documentation: Product passport and operational documentation

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Warranty
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