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CHAPTER THREE
T-6A INSTRUMENT NAVIGATION
030 Radial
360
360
360
090
270
180
210 Radial
Figure 3-1 VOR Navigation
The above example concerned EHSI indications with the aircraft at a fixed position. Let us now
consider the changes in EHSI indications produced by a moving aircraft.
NOTE
The following examples assume no wind conditions.
When flying either directly inbound to or outbound from a NAVAID, you will be maintaining a
constant course and staying on the same radial. In Figure 3-2, aircraft "A" is flying inbound to
the NAVAID with a heading of 135. The position of the aircraft is northwest of the NAVAID
on the 315 radial. It stays on the same radial despite the fact its geographical position changes
(moves closer to the station).
Aircraft "B" in Figure 3-2 is outbound from the NAVAID with a heading of 225. Again the
geographical position changes but the aircraft remains on the 225 radial.
If you fly a heading that does not take you directly inbound or outbound in relation to a
NAVAID, your position relative will change. In Figure 3-2, while maintaining a heading of
360, aircraft "C's" position changes from southeast of the NAVAID on the 135 radial to
northeast of the NAVAID on the 045 radial.
Figure 3-2 illustrates two important principles:
The tail of the needle always indicates which radial the aircraft is on.
1.
2.  Maintaining a constant heading if not flying directly to or from a NAVAID, will cause the
tail of the needle to rise and the head to fall (assuming no wind conditions).
3-2
FUNDAMENTALS OF INSTRUMENT NAVIGATION


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