A runway intended for the operation of aircraft using visual approach procedures, or an instrument approach procedure down to a height above aerodrome not lower than 500 feet.
A runway served by instrument navigation aids that provide at least lateral guidance adequate for an instrument approach procedure down to a HAT lower than 500 feet but not lower than 250 feet.
A runway served by instrument navigation aids that provide lateral and vertical guidance adequate for an instrument approach procedure down to a HAT lower than 250 feet.