INTERCEPT PROCEDURES TEXTBOOK
Recall that drift occurs away from the collision bearing and that the rate will increase as the
bogey gets further away from CB. (As range halves, degrees off CB will double)
(3) Scope Drift: This is the resultant rift that is perceived on the scope, for whatever reason.
If the fighter is not turning, then any drift on the scope will be due to intercept drift. If the
fighter is turning, then drift on the scope will be due to both turn and intercept drift.
After the displacement turn, the fighter is now in a position of increasing, maintaining or
decreasing lateral separation. Since the displacement turn has placed the target approximately
25° off collision bearing, intercept drift will occur. Additionally, since the DT moved the target
outside collision bearing, the drift will occur away from the fighter's nose.
At this point, the objective of the fighter is to start a turn to counter this outward drift. The
exact positioning of where to place the target on the scope will vary, depending on the amount of
turning room available when starting the counterturn.
This outward intercept drift is countered by maintaining a turn into the target and inducing
turn drift. This turn drift is in the opposite direction of the intercept drift, thereby maintaining
the bogey at a desired angle off.