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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* For a precision approach procedure (ILS, GCA): Ceiling 600 feet and visibility of two statute miles.
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.

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