Intercepting a radial from an arc

T-45C TS INav-05

TACAN/VOR Navigation and Holding Procedures

(2) Determine direction to turn

(3) Determine desired lead point

(4) Initiate 90-degree intercept when DME equals

radius of arc plus or minus desired lead

NOTE: Add lead when you’re tracking to the

station; subtract lead when you’re tracking from

the station.

(5) Adjust AOB to maintain proper distance by

keeping bearing pointer on wingtip position

NOTE: You may combine the AOB and chord

methods to maintain the arc and aircraft control.

The two methods are normally distinguished

according to DME limits; however, outside of

12 DME, the AOB required to maintain an arc will

probably be too small to hold accurately.

COMMON ERROR: Not monitoring DME and

rolling out at the wrong time and on the wrong

DME arc.

3. Intercepting a radial from an arc

a. Set desired course in course selection window

b. Determine lead point - divide DME of arc into 60 and

multiply the product by 1 percent of ground speed.

15 = 4 radials;

------------- X 1% GS = LPC

250 x 1% = 2.5 ground speed;

Arc DME

4 x 2.5 = 10 radial lead

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