A typical normally aspirate piston engine plane running at sea level on take-off power may need 11,000 volts from the ignition harness to make a spark at the plug. That’s10 kv (10,000 volts) to break the spark plug gap and another 1 kv (1,000 volts) at the distributor gear (magnetos). Voltage in cruise is much less (~1,000 volts overall) Add-on engine heat and vibration which the ignition harness must also endure and some wear down with use is inevitable.
What’s the cost for an ignition harness replacement on a Cirrus SR22?
We had one ignition harness on our Cirrus SR22-G3 overhauled because we were getting some interference in our avionics. Here’s cost detail from our work order at an authorized service center.
Ignition Harness Replacement Cost Summary
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Ignition harnesses wear down with usage and are an indirect variable cost of flying. The harness may deliver service through TBO or could show signs of failing before then. In a Cirrus shared ownership, you should consider a reasonable cost in the hourly rate for ignition harness replacement.
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