513.1 Scope. This article shall apply to buildings or struc tures in any part of which aircraft containing Class I (flam mable) liquids or Class II (combustible) liquids whose temperatures are above their flash points are housed or stored and in which aircraft might undergo service, repairs, or alterations. It shall not apply to locations used exclusively for aircraft that have never contained fuel or unfueled aircraft.
FPN No. I: For definitions of aircraft hangar and unfueled aircraft, see NFPA 409-2004, Standard on Aircraft Hangars.
FPN No. 2: For further information on fuel classification see NFPA 30-2008, Flammable and Combustible Liquids Code.
513.2 Definitions. For the purpose of this article, the fol lowing definitions shall apply.
Aircraft Painting Hangar. An aircraft hangar constructed for the express purpose of spray/coating/dipping applications and provided with dedicated ventilation supply and exhaust.
Mobile Equipment. Equipment with electrical components suitable to be moved only with mechanical aids or is provided with wheels for movement by person(s) or powered devices.
Portable Equipment. Equipment with electrical compo- nents suitable to be moved by a single person without mechanical aids.
513.3 Classification of Locations.
(A) Below Floor Level. Any pit or depression below the level of the hangar floor shall be classified as a Class I, Division 1 or Zone 1 location that shall extend up to said floor level.
(B) Areas Not Cut Off or Ventilated. The entire area of the hangar, including any adjacent and communicating areas not suitably cut off from the hangar, shall be classified as a Class I, Division 2 or Zone 2 location up to a level 450 mm (18 in.) above the floor.
(C) Vicinity of Aircraft.
(1) Aircraft Maintenance and Storage Hangars. The
area within 1.5 m (5 ft) horizontally from aircraft power plants or aircraft fuel tanks shall be classified as a Class I, Division 2 or Zone 2 location that shall extend upward
from the floor to a level 1.5 m (5 ft) above the upper surface of wings and of engine enclosures.
(2) Aircraft Painting Hangars. The area within 3 m (10 ft) horizontally from aircraft surfaces from the floor to 3 m (10 ft) above the aircraft shall be classified as Class I, Division 1 or Class I, Zone 1. The area horizontally from aircraft surfaces between 3.0 m (10 ft) and 9.0 m (30 ft) from the floor to 9.0 m (30 ft) above the aircraft surface shall be classified as Class I, Division 2 or Class I, Zone 2.
FPN: See NFPA 33-2007, Standard for Spray Application Using Flammable or Combustible Materials, for information on ventilation and grounding for static protection in spray painting areas.