An instrument approach may be divided into as many
as four approach segments: initial, intermediate, final,
and missed approach. Additionally, feeder routes provide
a transition from the en route structure to the IAF.
Figure 5-26. Approach Chart Briefing Sequence.
The U.S. Standard for Terminal Instrument Procedures
(TERPS) criteria provides obstacle clearance for each
segment of an approach procedure as shown in Figure
5-27 on page 5-38.