Definition

Instrument approach procedure (IAP). 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. Instrument approach procedures are classified as follows:

• Non-precision approach (NPA) procedure
• Approach procedure with vertical guidance (APV)
• Precision approach (PA) procedure

Source: ICAO Doc 8168 PANS-OPS

Description

An instrument approach procedure may have five separate segments: