Double the Angle Intercepts

CHAPTER SIX

T-34C INSTRUMENTS

Determine the location of the desired radial relative to the tail of the needle (left or

right).

Start a turn toward the desired radial.

Stop the turn with the new course under the first 45 benchmark in the top half of the

RMI. Note and fly the associated heading.

NOTE

To ensure you have the proper intercept established, check that the

head of the needle is in a position to fall, or the tail of the needle in

a position to rise to the new course. Also, to ensure proper sensing

of the CDI, check that the course selected is in the upper half of the

RMI.

Maintain this intercept heading until the needle approaches the desired course.

Judge the rate of intercept and plan your turn to roll out on the new course.

Track on the desired course.

Common Errors

Turning toward the new COURSE vice RADIAL.

Not doing Steps 13 prior to beginning the turn.

Flying the benchmark instead of the heading.

609.

DOUBLETHEANGLE INTERCEPTS

Amplification The doubletheangle intercept is a maneuver that provides a shallow

and easily controlled rate of intercept to a desired course. The spacing between radials decreases

the closer you get to the station. A large intercept angle, when close to the NAVAID, could easily

result in overshooting the desired course. A shallow intercept (doubletheangle) would prevent

this.

Procedure

During the last half of your turn toward a desired course, note the number of degrees

between the head of the needle and the desired course inbound.

Utilizing the one-third rule, plan your rollout so as to stop on a heading double the

number of degrees from the desired course to the head of the needle. In other words,

place the head of the needle halfway between the aircraft heading and the desired

course.

6-24 RADIO INSTRUMENT FLIGHT PROCEDURES