Instrument Approach Procedure
|Term||Instrument Approach Procedure|
A series of predetermined manoeuvres by reference to flight instruments with specified protection from obstacles from the initial approach fix, or where applicable, from the beginning of a defined arrival route to a point from which a landing can be completed and thereafter, if a landing is not completed, to a position at which holding or en-route obstacle clearance criteria apply.
ICAO, Official definition, Annex 2 (Rules of the Air) and 4 (Aeronautical Charts), PANS-OPS/I and PANS-OPS/II
Aeronautical Information Feature Data Dictionary (AIFDD)
Instrument approach procedures are classified as follows: 1. Non-precision approach (NPA) procedure: An instrument approach procedure which utilizes lateral guidance but does not utilize vertical guidance; 2. Approach procedure with vertical guidance (APV): An instrument procedure which utilizes lateral and vertical guidance but does not meet the requirements established for precision approach and landing operations; 3. Precision approach (PA) procedure: An instrument approach procedure using precision lateral and vertical guidance with minima as determined by the category of operation. Note that lateral and vertical guidance refers to the guidance provided either by: a) a ground-based navigation aid; or b) computer-generated navigation data.