landing minimums, IFR

landing minimums, IFR (instrument flight rules)

The minimum visibility prescribed for landing a civil aircraft while using an instrument approach procedure. This visibility minimum is in addition to the minimums with respect to the decision height/decision altitude prescribed in the instrument approach procedures as follows:
i. Straight-in landing minimums. A statement of the MDA (minimum descent altitude) and the visibility, or the decision height (DH) and the visibility, required for a straight-in landing on a specified runway.
ii. Circling minimums. A statement of the MDA and the visibility required for the circle-to-land maneuver.
Descent below the established MDA or DH is not authorized during an approach unless the aircraft is in a position from which a normal approach to the runway of intended landing can be made and adequate visual reference to required visual cues can be maintained. See circling minimums.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved