Tools of choice around aircraft are usually air driven to minimize the possibility of fuel vapor ignition due to commutator sparking or other electrical equipment arc. Article 513 makes a lot of sense since wall driven electrical tools and measurement equipment often find their way into a hangar as well. Even though some hangars have epoxy paint floors or other insulating flooring installed over the concrete, often the aircraft are grounded with a ground lead, so it is important that any wall power driven electrical tools or test equipment used around aircraft are GFCI protected, since a serious shock hazard can exist to personnel operating electrical equipment on or in a grounded aircraft if the power source is not GFCI protected. Ed Cohn (Electrician and A/P mech)
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