Figure 9 - P-8010087
 Click here to make tpub.com your Home Page Page Title: Figure 9 Back | Up | Next

 Web www.tpub.com

Home

Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion

INSTRUMENT NAVIGATION
MAINTAINING ARCS
In theory, it is a simple matter to maintain an arc. The aircraft will fly in an exact circle
around the station if you maintain a relative bearing of 090° or 270° to the station at all times. In
practice, this would require a constant angle of bank throughout the whole arc.
Another method for maintaining an arc is to fly a series of short legs, keeping the head of the
#2 needle on or near the wingtip position (i.e., 9 or 3 o'clock) while maintaining the
desired range. This is sometimes known as the "Chord" method, for the aircraft will be tracing a
series of chords to the arc as it progresses along the arc.
Always remember the relationship between the head of the needle and DME. If the head of
the needle is above the "wingline" (90° fiducial marker on BDHI/RMI) the DME will decrease.
If the head of the needle is below the wingline DME will increase. These are no wind rules.
Figure 9
The flight path of an aircraft employing the Chord Method might look like the path depicted
by the dotted line.
(Figure 9)
The steps to follow when usinq the chord method are:
1. Start with the head of the #2 needle on the wing tip and the aircraft at the desired range.
2. Maintain heading and allow the head of the needle to move 10 degrees behind the
wingtip position. (This will cause the ran ge to increas e slightl y.)
3. Turn toward the station to place the head of the needle 10 degrees ahead of the wing tip.
4. Maintain this heading until the head of the needle again falls behind the wing tip.
TACAN POINT-TO-POINT 4-7

 Integrated Publishing, Inc. 6230 Stone Rd, Unit Q Port Richey, FL 34668 Phone For Parts Inquiries: (727) 493-0744 Google +