Turn to this updated heading.
Try to expedite these first six steps to establish the aircraft on a
heading that will take it in the general direction of the new fix.
Visually determine if the line that connects the two fixes is vertical. This line
represents your desired track. If it is vertical, you are on the correct heading at that
instant. Apply any wind corrections that are required to remain on the proper track.
If your line is not vertical, you must turn the aircraft to make it so. This can be done
without the aid of a straightedge. If the line tilts right, turn right to make the line
vertical. If the line tilts left, turn left to make the line vertical.
While enroute, twist in the desired fix radial or course to provide correct sensing and
enable you to accurately identify the fix. Toggle the VOR/TAC selector under the
altimeter to TACAN.
As the aircraft approaches the point, it will be necessary to determine which you will
reach first the radial or the DME. To come as close as possible to the new point, it
will be necessary to judge the rate at which the DME is moving and the rate at which
you are crossing radials. If it is determined that one rate is moving faster than the
other, it may be that the aircraft will reach the DME or radial first rather than
simultaneously. Keep the following in mind when trying to hit a point:
DME Rate of Change
When the needle is closer to the heading index than the 90º benchmark,
i.e., above the 45º benchmark, the DME will change faster than the
radials. The opposite is true when the needle is nearer the 90º
benchmark, i.e., when the needle is below the 45º benchmark.
Remember, when the head of the needle is above the 90º benchmark, the
DME will get smaller. When the head of the needle is below the 90º
benchmark, the DME will get larger. The only exception to these rules is
in the case of strong winds aloft.
To get your DME to "speed up," turn to place the needle closer to the
heading index. This will slow the rate at which you are crossing radials.
When going inbound, you will be working the head of the needle. When
going outbound, you will be working the tail.
Radial Rate of Change
To cross radials faster, turn to place the needle closer to the 90º
benchmark. Simultaneously, the rate that the DME is changing will slow.
6-56 RADIO INSTRUMENT FLIGHT PROCEDURES