Figure 3-11 TACAN Minimums

CHAPTER THREE

RADIO INSTRUMENTS

Figure 3-11 TACAN Minimums

TACAN Components

TACAN approaches are usually flown from the IAF only for practice, or if two-way radio failure

has occurred. If radio communications and RADAR are available, most instrument approach

procedures (IAP) have four segments: the initial segment, the intermediate segment, the final

segment, and the missed approach segment (reference: OPNAVINST 3722.16_ "TERPS").

NOTE

Clearance for an approach is clearance for ALL 4 segments of an

approach.

TACAN approaches are most frequently flown via radar vectors to the final approach course (see

below).

TACAN Initial Approach Course Alignment

A "penetration" is the type of initial approach segment most often used in High Altitude IAPs.

The initial segment begins at the IAF. Most, but not all, approaches begin with a descent at the

IAF. If a High TACAN approach begins with a descent at the IAF, it is considered good practice

to begin the descent only after becoming established on the initial approach course. At times, an

aircraft will be cleared to an IAF on a course significantly different from the initial approach

course. In such cases, any one of three methods may be used to establish the aircraft on course,

as shown in Figure 3-12.

3-36

RADIO INSTRUMENTS