Guide: Holding Pattern Entry
Holding patterns are the holding rooms of the sky. When an airport is congested, or weather drops below minimums, Air Traffic Control (ATC) commands aircraft to fly repetitive, racetrack-shaped loops over a specific GPS waypoint or VOR station until space clears up. Because instrument flying relies on strict procedures, you cannot just randomly turn the aircraft into the holding pattern. The FAA and ICAO mandate specific entry procedures—Direct, Parallel, or Teardrop—depending on the angle at which your aircraft is approaching the holding fix. Flying the wrong entry maneuver can result in spatial disorientation, airspace violations, and flying outside the protected airspace buffer into oncoming traffic. Figuring out which entry to execute while flying a complex aircraft in the clouds is mentally exhausting. This calculator instantly computes the correct geometric sector and dictates the exact flight maneuver required.
How to Use This Tool
Enter your current Aircraft Heading—the magnetic direction you are currently flying to reach the holding fix. Next, input the Inbound Course given by ATC (e.g., "Hold East on the 090 radial, left turns"). Select the Turn Direction; standard holds use right-hand turns, but ATC frequently assigns non-standard left-hand turns for traffic separation. If you have a known Wind Drift correction angle, enter it; otherwise, leave it at zero. The calculator will project your vector onto the holding geometry.
The Math Behind It
The engine first calculates the Outbound Course by adding or subtracting 180 degrees from the Inbound Course. It then maps the 360-degree compass rose around the holding fix into three distinct, asymmetrical geometric sectors: a 70-degree Teardrop sector, a 110-degree Parallel sector, and a massive 180-degree Direct sector. The boundaries of these sectors flip horizontally depending on whether the turns are standard (right) or non-standard (left). The engine checks your inbound Aircraft Heading against these sector boundaries to output the legal maneuver.
Understanding Your Results
Recommended Entry provides the explicit name of the maneuver (Direct, Parallel, or Teardrop) you must execute upon crossing the fix. The Outbound Leg heading gives you the exact compass degree you must turn to once you enter the hold. The Maneuver text provides a visual, step-by-step cue for the stick-and-rudder action required the moment your GPS indicates you have hit the waypoint.
Real-World Example
A pilot is flying a heading of 090° (due East) directly toward a VOR station. ATC instructs: "Hold West of the VOR on the 270 radial, standard right turns." The Inbound Course toward the station from the west is 090°. The calculator determines the Outbound Course will be 270°. Because the pilot is already flying 090° inbound, they are approaching from the 180-degree direct sector. The Recommended Entry is Direct. The Maneuver instructs the pilot to fly directly over the fix, immediately execute a standard rate right turn to a heading of 270°, and fly the outbound leg for one minute before turning back inbound.
Frequently Asked Questions
What is the 'Protected Side' of a hold?
The protected side is the geographical area where the actual racetrack pattern is flown. ATC clears this specific airspace of all other traffic. The 'non-protected side' is the airspace outside the pattern. Parallel and Teardrop entries are specifically designed to keep the aircraft from wandering into the non-protected side while maneuvering.
What is an EFC time?
EFC stands for Expect Further Clearance. ATC is legally required to give you a time when they expect to let you out of the hold. If you lose two-way radio communications with ATC while in the clouds, you are legally required to leave the hold and shoot the approach the exact minute your EFC time arrives.
How do holding speeds work?
To keep aircraft inside the protected airspace boundaries, the FAA enforces strict maximum holding speeds based on altitude. From the surface to 6,000 ft, max speed is 200 KIAS. From 6,001 to 14,000 ft, it is 230 KIAS. Above 14,001 ft, it is 265 KIAS.
How long is a holding leg?
Standard holding legs are timed. At or below 14,000 feet, the inbound leg should take exactly 1 minute. Above 14,000 feet, the inbound leg should take 1.5 minutes. If there is a strong headwind on the inbound leg, the pilot must extend the outbound leg time to ensure the inbound leg hits the 1-minute mark perfectly.