IN THE VFR WORLD, reversing course is usually no big deal. If you want to turn, you clear the area to look for any potential conflict with other aircraft, then go ahead and make your move. In the instrument flying world things are more regimented-especially when it comes to instrument approaches. The whole idea behind many instrument approaches is to track a final approach course that's aligned with the destination runway-in other words, to make a straight-in approach. Sometimes this means flying outbound on the final approach course, then turning around to intercept that straight-in, final approach segment. In other words, making a procedure turn.
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