Classification Level of Pit in Aircraft Hangar

Any pit or depression below the level of an aircraft hangar floor shall be classified as a _____ location that extends up to said floor level.

a) Class I, Division 1
b) Class I, Division 2
c) Class II, Division 1
d) Class III

See answer and applicable Code reference

The correct answer is: a) Class I, Division 1

Article 513 applies to buildings or structures that contain Class I or Class II liquids and where aircraft might undergo service, repair or alteration. As per 513.3(A), "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."

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