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precision approach procedure

precision approach procedure

A standard instrument approach procedure utilizing azimuth and glide-path information provided by an ILS (instrument landing system), an MLS (microwave landing system), or a PAR (precision approach radar).
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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References in periodicals archive
* For a precision approach procedure (ILS, GCA): Ceiling 600 feet and visibility of two statute miles.
IFR ALTERNATE AIRPORT WEATHER MINIMUMS--OTHER THAN HELICOPTERS
It says that as far as your alternate goes, if specific alternate minimums are not published for that airport (more on this in a minute), and if between an hour before and an hour after you expect to get there (same as the 1-2-3 rule), the airport is expected to have at least a 600-foot ceiling and two miles visibility, you can use it if and only if it has a precision approach procedure. If it has only a non-precision approach procedure, everything stays the same except the 600-foot minimum ceiling goes up to 800 feet.
Alternates made easy: When the weather's bad, choosing an alternate airport can be a tricky balance of time, distance, fuel and minimums. It doesn't have to be so hard
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