The Procedure Turn is the method at which aircraft perform precise turn-arounds to correct its course as needed. On an approach, sometimes it is necessary to fly OVER a navaid, a fix, or a point, continue OUTBOUND, then turn-around to become properly oriented for landing.
On this particular approach, a Procedure Turn is needed when flying from the WEST in order to turn the aircraft around heading 279°.
Typically, an inbound aircraft would fly to the GVO VORTAC then fly OUTBOUND on its 099° Radial. Once reaching the Initial Approach Fix (ZACKS) he would continue until he could perform a Procedure Turn (normally within the 10nm circle). After turning the aircraft around, he would re-align on the 099° Radial, and fly an INBOUND course of 279° to the Final Approach Fix (ZACKS) for landing.
The Procedure Turn is performed by the following method:
1. Turn the airplane 45° to the direction of the arrow/barb on the approach plate (Right 144°)
2. Fly this heading for 1 minute (staying inside the 10nm circle)
3. At ONE minute, turn the aircraft in the OPPOSITE direction to the reciprocal (Left 324°) until intercepting the GVO 099° Radial again
4. Turn again to the correct inbound course (Left 279°) to complete the Procedure Turn