Quantcast Figure 4-5 Turn to Course

 

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CHAPTER FOUR
T-6A INSTRUMENT NAVIGATION
408. DOUBLE-THE-ANGLE INTERCEPTS
The DTA intercept is a maneuver that provides a shallow and easily controlled rate of intercept
to a desired course. The spacing between radials decrease the closer you get to the station. A
large intercept angle, when close, could very easily result in overshooting the desired course. A
DTA intercept would prevent this.
PROCEDURE
1.
During the last half of the turn toward a desired course, note the number of degrees
between the head of the bearing pointer and the desired course inbound.
2.
Plan the rollout to stop on a heading double the number of degrees from the desired course
to the head of the bearing pointer. In other words, place the head of the bearing pointer halfway
between the aircraft heading and the desired course.
3.
The head of the bearing pointer is now in a position to fall to the desired course. Figure 4-5
illustrates a DTA intercept to a course of 260.
A/C Heading 260
265
260
A/C on 085 R
Figure 4-5 Turn to Course
4.
As the head of the bearing pointer falls, maintain heading until approaching the desired
course. Monitor the bearing pointer and CDI and initiate a turn to course. Once established on
course, apply drift correction and resume tracking procedures until station passage. Since the
aircraft is close to the station, only small changes in heading will be necessary to maintain
course.
COMMON ERRORS
1.
Overshooting the desired course.
2.
Not applying drift correction once established on desired course.
3.
Chasing the bearing pointers close to the station.
4-16 INSTRUMENT NAVIGATION


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