Instrument Flight
Flight Procedures
When intercepting an arc from a radial that is significantly more or less than a 90 degree turn, adjust the
lead point by applying the following:
*
For turns of approximately 45 degrees use 1/3 of the distance calculated for a 90 degree turn.
*
For turns of approximately 60 degrees use 2/3 of the distance calculated for a 90 degree turn.
*
Turns of 30 degrees or less, require very little lead.
13
12
11
10
10 DME Arc
Lead Point DME
300 KGS
1/2 SRT
1% GS = Radius of Turn
Figure 22: RADIAL TO ARC INTERCEPT PROCEDURE
Maintaining an Arc Around a Station
Two ways of maintaining an arc around a station are the chord method and the angle of bank method.
Either procedure (or a combination of the two) will work at any distance from a station. However, the
chord method is generally more practical when you’re flying a distant arc (usually more than 12 DME from
a station) while the angle of bank method usually works better when you’re flying an arc close in (12 DME
or less). The chord method consists of a series of short straight legs, connected by turns. The angle of
bank method is flown as a shallow turn with variable AOB to maintain a constant arc.
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