Skydiving School (Dictionary)

Below are commonly used terms by expert skydivers and Skydive Philadelphia’s staff. If you do not see a term in our dictionary that you have a question about, feel free to give us a call!

Accelerated Freefall

A skydive that is performed without an instructor attached via harness. 2 Instructors will accompany the student during their jump to ensure that the skydive goes as planned.


A device that measures the skydivers current altitude. Altimeters are used to judge height above the landing zone and allow the instructors to deploy the parachute at proper altitude.

Automatic Activation Device (AAD)

A device that is connected to the reserve parachute container. AAD’s automatically deploy the reserve parachute at a pre-determined altitude, speed, or time.


Also known as parachutes, canopies allow each and every skydiver to land at a safe and comfortable speed.

Drop Zone

Any area that skydivers reserve to land. Drop Zone can also refer to the skydiving establishment, as a whole.


The time during a skydive that the skydiver is falling without the parachute deployed. Freefalls typically last anywhere from 45-60 seconds.


An object which holds the skydiver securely inside the parachute system.


To properly fold the parachute system before a scheduled jump.

Pilot Chute

A smaller parachute that is used to allow the main parachute to open correctly and promptly.


Refers to the sharing of one parachute system with another person. Tandem jumps are typically performed by newcomers and students.

Wing Suit

A jumpsuit that is designed specifically for the act of gliding horizontally until parachute deployment.

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- Derek Johnson

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- Scott

What a great experience! All staff was curtious and helpful. I jumped with Rod, great Dude with an awesome personality, he was kind and patient witih me as it was my first jump. Awesome jump, one of the best thrills of my life. Can't say enough about the great job all staff does. Can't wait to jump again! I wiil recommend Skyline Philadelphia to my friends.
- Eric Fleming