Instructor-assisted deployment (IAD) is a parachute deployment program most adequately similar to
static line
A static line is a fixed cord attached to a large, stable object. It is used to open parachutes automatically for paratroopers and novice parachutists.
Design and use
A static line is a cord attached at one end to the aircraft and at the oth ...
. The main difference is that instead of being deployed by a static line, the student's
jumpmaster
Jumpmasters are the expert paratroopers in an airborne unit who train and teach the military techniques for jumping from airplanes. They are responsible for training soldiers who enter Army Airborne School into paratroopers and managing airborne ju ...
(who is in the plane with them) deploys the student's parachute by throwing the pilot chute downward and clear of the door as the student exits.
Among the benefits to IAD is the ability to use the same parachute equipment as the students will use when they progress to deploying their parachutes on their own, and the decreased chance of an inconvenience called
line twists. Furthermore, in the situation of a
bag lock malfunction, the student won't stay attached to the plane.
Parachuting
{{Air-sports-stub