procedure turn - manoeuvre which reverses the direction of an aircraft's flight during an instrument approach procedure to enable it to intercept the final approach course.
psi - pounds per square inch, a measurement of pressure.
Procedure turn. A maneuver prescribed when it is necessary to reverse direction to establish an aircraft on the intermediate approach segment or final approach course.
Procedure Turn: A maneuver for executing a 180 degree turn at a particular location using a compass and a radionavigation aid. Drawn on a piece of paper, it looks vaguely like those "teacup handle" exits on New Jersey highways.
Procedure Turn
Depending on which way a pilot enters an instrument approach, in may be necessary to turn the aircraft back toward the airport in order to fly the approach. A procedure turn is the safe, controlled, time-consuming way to do this.
PROCEDURE TURN INBOUND- That point of a procedure turn maneuver where course reversal has been completed and an aircraft is established inbound on the intermediate approach segment or final approach course.
PT
Procedure Turn
PTT
Push-to-talk (switch)
PULL-PULL
A linkage set up using two rods or wires. One is pulled for one direction, the other is pulled for the other.
That part of an instrument approach procedure which commences at the specified final approach fix or point, or where such a fix or point is not specified, at the end of the last procedure turn, base turn or inbound turn of a racetrack procedure, ...
(a) at the end of the last procedure turn, base turn, or inbound turn of a racetrack procedure, if specified, or ...
A straight in instrument approach is one where the final approach is begun without first having executed a procedure turn, not necessarily completed with a straight-in landing or made to straight-in landing minimums.
[edit] Circling To Land ...
Even on IFR flights, dead reckoning is important. Sometimes it's merely a convenience, and sometimes it's absolutely required; procedure turns and holding patterns are familiar examples.
14.3 Navigating by Instruments ...
One taught me to slow down, and get in the first notch of flaps, just prior to reaching the fix (a VOR in this case) before the procedure turn. The other had me slow down during the outbound leg of the PT.
 See also: Flight, Aircraft, Pilot, Instrument approach, Landing
  
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