Definition
A resistor or capacitor built into an aircraft magneto ignition system to reduce the high-energy electrical spark that occurs when the breaker points open. By dampening this spark, the suppressor reduces pitting and erosion of the points, extends their service life, and limits radio interference generated by the ignition system.
Plain English
A small electrical part inside the magneto that softens the spark made when the ignition contacts open and close. This stops the contacts from burning out quickly and keeps the ignition from causing static in the radios.
Context Anchor
Seen in aircraft exhaust system descriptions, maintenance inspections, and fire-prevention equipment on some engines.
Derivation
Suppressor comes from the Latin supprimere, meaning to press down or hold back. The part holds back the strength of the spark so it does less damage.
Why Pilots Care
Unsuppressed sparks create radio static that can mask ATC calls, navigation signals, and emergency transmissions.
Intuition Check
Do not confuse a spark suppressor with the spark plug or ignition system. It deals with hot particles leaving the exhaust, not with making the engine fire internally.
Example Sentence 1
The mechanic traced the radio noise to a worn spark suppressor in the left magneto.
Example Sentence 2
During the preflight, the pilot noticed radio noise and traced it to a failed spark suppressor on the generator.