Figure 7 Collision Course Formula Application

INTERCEPT PROCEDURES TEXTBOOK

The first collision course correction method goes one step further. Since it is known that AO

must equal TA in a co-speed environment:

Example:

Figure 7

The intercept triangle can be visualized on the face of a BDHI with the center representing

the intersection of the two flight paths. Note that the dashed bogey bearing line can be

transposed to the center of the BDHI. Since the two dashed lines are parallel, they form equal

angles when cut by a transversal line represented by the bogey or the fighter flight path. Note

that the TA and AO within the intercept triangle can be depicted within the cut, where they are

shown to be equal to each other but opposite in direction.

The previous example (Figure 7) illustrated right TA, where we added the degrees from BR

to BB and then added that same number of degrees (continuing in the same direction) to find the

collision course.

Collision Course Correction Formula 2

Further CCCs with a contact on the scope will be done according to the second formula.

This method is important since the GCI controller's bogey bearing calls are less accurate than the

radar scope information. After the bogey is on the scope, aircrew can read AO directly off the

scope and compare it with the cut. The purpose is still to make AO equal in quantity but

opposite in direction to TA.