The purpose of the initial approach segment is to
provide a method for aligning the aircraft with the
intermediate or final approach segment. This is
accomplished by using a DME arc, a course reversal,
such as a procedure turn or holding pattern, or by
following a terminal route that intersects the final
approach course. The initial approach segment
Figure 5-30. Procedure Turn Obstacle Clearance.
begins at an IAF and usually ends where it joins the
intermediate approach segment or at an IF. The letters
IAF on an approach chart indicate the location
of an IAF and more than one may be available.
Course, distance, and minimum altitudes are also provided
for initial approach segments. A given procedure
may have several initial approach segments.
When more than one exists, each joins a common
intermediate segment, although not necessarily at the
Occasionally, a chart may depict an IAF, although there
is no initial approach segment for the procedure. This
usually occurs at a point located within the en route
structure where the intermediate segment begins. In this
situation, the IAF signals the beginning of the intermediate