T-6A INSTRUMENT NAVIGATION
Figure 4-16 illustrates a typical no-wind orbit. In this example, the inbound turn resulted in an
overshoot and a DTA intercept was set. The TAIL-RADIAL-WIND rule indicated a wind from
the north. This resulted in a 15° heading correction factor and the inbound timing of 50 seconds
indicated a 10-second timing correction factor.
The third and subsequent orbits in holding are called correction orbits. Correction orbits are
flown by applying the correction factors determined on your no-wind and subsequent correction
Figure 4-16 Correction Orbit
We will apply our heading correction to the outbound leg. The wind is from the north and the
correction factor is 15°. For the intercept to the inbound course, your heading would be 300°
(i.e., DTA intercept). This will get you on the holding course inbound to the fix. A 5° crab is
then required to maintain course. The no-wind outbound heading would be 090°. By applying a
triple drift of 15° to the outbound heading, our compensated heading is 075°. Therefore, use
075° as an outbound heading on the correction orbit.
The inbound leg in Figure 4-17 took 50 seconds, indicating a tailwind component with a 10
second correction factor. To make the inbound leg a full 60 seconds, longer outbound timing is
needed. Apply the 10-second factor to 60 seconds (original outbound timing). The outbound
timing on the correction orbit is then 70 seconds. If the inbound leg of the no-wind orbit was
longer than 60 seconds, use the timing correction factor to shorten the next outbound leg (to a
minimum of 30 seconds on your first outbound leg see "HOLDING DURING ADVERSE
WIND CONDITIONS" on the next page).