103 FAA Chart Users’ Guide - Terminal Procedures Publication (TPP) - Terms Altitudes Holding Patterns and Procedure Turns A procedure turn (PT) is the maneuver prescribed to perform a course reversal to establish the aircraft inbound on an  intermediate or final approach course. The procedure turn or hold-in-lieu-of procedure turn is a required maneuver when it  is depicted on the approach chart. However, the procedure turn or the hold-in-lieu-of PT is not permitted when the symbol  “NoPT” is depicted on the initial segment being flown, when a RADAR VECTOR to the final approach course is provided,  or when conducting a timed approach from a holding fix. The procedure turn will be shown in the planview and in the  profile of the chart. Waypoints designated as a holding fix are shown as fly-by, without the circle around the symbol. However, in the event  the holding fix/waypoint is also designated in some other part of the procedure (i.e., IAF) with a fly-over function, then the  holding fix/waypoint will be charted as a fly-over point. If a holding pattern has a non-standard speed restriction, it will be depicted by an icon with the limiting air speed shown  inside the holding pattern symbol. These elements, along with the direction of the turns, define the holding pattern. If two  types of holds are located at the same point, the procedural holding pattern will be shown in-lieu of arrival or missed ap- proach holding patterns. Timing or distance limits for Hold-in-lieu of Procedure Turn Holding Patterns will be shown. Missed Approach Hold In-Lieu of Procedure Turn Arrival Holding Patterns are used for many reasons, including deteriorating weather or high traffic volume. Holding might also be  required following a missed approach. Each holding pattern has a fix, a direction to hold from the fix, and an airway, bear - ing, course, radial, or route on which the aircraft is to hold. These elements, along with the direction of the turns, define  the holding pattern.  Altitudes that are shown along a route are minimum altitudes.  Restrictive altitudes along the procedure track are shown paired with their respective fix/ facility. Minimum, Maximum,  Mandatory and Recommended Altitudes are shown. Type Description Example Recommended Altitude Recommended altitude is depicted with no lines above or below it Minimum Altitude Minimum altitude is depicted as a number with a line below it Maximum Altitude Maximum altitude is depicted as a number with a line above it Mandatory Altitude Mandatory altitude is depicted as a number with a line above and below it Mandatory Block Altitude Mandatory block altitude is depicted with a minimum and a maximum altitude.