Quick Hits

Episode 1: Scope, Exclusions & Below-Floor Pits (513.1 – 513.5(B))

SLIDE 1 (HOOK / COVER)

⚡ NEC Quick Hit: Aircraft Hangars Overview (Part 1 - Article 513) ⚡

Flammable aviation fuel, maintenance bays, and hangar floor classifications—welcome to Article 513! Which aircraft facilities fall under these strict code rules? Let's break it down! 👇

SLIDE 2 (SCOPE & EXCLUSIONS)

What Buildings Are Covered:

• The Scope: Applies to buildings housing aircraft containing Class I (flammable) liquids or Class II (combustible) liquids whose temperatures are above their flash points, and where aircraft undergo service, repairs, or alterations.

• Excluded Locations: Does not apply to locations used exclusively for defueled aircraft or aircraft that have never contained fuel.

• Jet-A Fuel Note: Jet-A is a Class II combustible liquid (flash point at or above 100°F); Article 513 does not apply unless the fuel is used or stored above its flash point.

SLIDE 3 (BELOW-FLOOR & GENERAL FLOOR CLASSIFICATIONS)

Hazard Boundaries Near the Floor:

• Pits and Depressions: Any pit or depression below the hangar floor is classified as a Class I, Division 1 or Zone 1 location extending up to floor level.

• General Hangar Area: The entire hangar area (and communicating areas not suitably separated) is classified as a Class I, Division 2 or Zone 2 location up to a level of 450 mm (18 in.) above the floor.

SLIDE 4 (WRAP-UP)

💡 Apprentice Pro-Tip: Always verify whether an aircraft under construction or storage has contained fuel—manufacturing plants building aircraft that have never held fuel are entirely outside the scope of Article 513!

💬 Save this post for your next aviation facility rough-in!

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