It addresses the difference between a “megger” or high voltage resistance check, say 500 to 1000 or more volts, and a typical shop floor meter’s use. The “low voltage” referred to doesn’t hinge on exactly 8 or 10 volts. Although many volt meters use nine volts batteries, that’s close enough. A typical low voltage ohm meter (or the Tempest AT-5k meter which relies on a low voltage circuit) can help identify suspect plugs.
Hundreds of millions of spark plugs later it’s safe to say that the MIL Spec’s advice is good. It addresses checking spark plug resistance using a low voltage ohmmeter. Military Specification MIL-S-7886 provides guidance for aviation spark plug manufacturers. What we, as aircraft technicians, need is a useful available tool to identify a spark plug that might be causing a rough running engine. The question is “What’s causing the rough running engine and how can we fix it?” Conditions on a blazing hot or freezing cold ramp aren’t laboratory conditions. While what happens when 10,000 volts is forced across a resistor under laboratory conditions is interesting, it is hardly relevant to resolving the problems faced by IAs, A&Ps and AEs. Tempest Tech-Tip The “right” Way to Check Spark plug Resistorsĭiscussion about the “right” way to check spark plug resistance can go on until the cows come home.
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