T-10 parachute
The T-10 Parachute is a series of static line
Static line
A static line is a fixed cord attached to a large, stable object. It is used for safety in construction andto open parachutes automatically for paratroopers and novice parachutists.-Use in parachuting:...

-deployed parachute
A parachute is a device used to slow the motion of an object through an atmosphere by creating drag, or in the case of ram-air parachutes, aerodynamic lift. Parachutes are usually made out of light, strong cloth, originally silk, now most commonly nylon...

s used by the United States armed forces
United States armed forces
The United States Armed Forces are the military forces of the United States. They consist of the Army, Navy, Marine Corps, Air Force, and Coast Guard.The United States has a strong tradition of civilian control of the military...

 for combat mass-assault airborne operations and training. The most current version is the T-10D, which is currently being replaced by the T-11
T-11 parachute
The Non-Maneuverable Canopy Personnel Parachute System is the newest personnel parachute system to be adopted by the United States armed forces. The T-11 replaces the T-10, introduced in 1955...

 parachute system.


Depending upon air density
Density of air
The density of air, ρ , is the mass per unit volume of Earth's atmosphere, and is a useful value in aeronautics and other sciences. Air density decreases with increasing altitude, as does air pressure. It also changes with variances in temperature or humidity...

 and the jumper’s total weight, the parachute’s average rate of descent is from 22 to 24 ft/s (6.7 to 7.3 m/s); total suspended weight limitation is 360 pounds (163.3 kg). The parachute is deployed using either a 15 or static line, allowing the parachutist to be delivered by either C-130 or C-17 aircraft. The T-10D main parachute is a parabolic
In mathematics, the parabola is a conic section, the intersection of a right circular conical surface and a plane parallel to a generating straight line of that surface...

-shape and has a nominal diameter of 35 feet (10.7 m), 30 suspension lines and a mesh anti-inversion net.

The T-10D Parachute assembly consists of five components: pack tray, troop harness, deployment bag, riser, and canopy
Canopy (Parachute)
The term Canopy is used by skydivers or parachutists to describe the actual parachute itself, as opposed to the parachute system as a whole....

. The parachute has a combined service life of 16.5 years; service life is 12 years and shelf life is 4.5 years. The T-10D Parachute must be repacked every 120 days. The T-10D Parachute is made of nylon
Nylon is a generic designation for a family of synthetic polymers known generically as polyamides, first produced on February 28, 1935, by Wallace Carothers at DuPont's research facility at the DuPont Experimental Station...

 materials commonly used in the manufacturing of parachutes.

The Modified Improved Reserve Parachute System (MIRPS) includes a standard T-10 reserve parachute canopy assembly, integrated with a commercial deployment assistance device composed of a bridle line, pilot parachute
Drogue parachute
A drogue parachute is a parachute designed to be deployed from a rapidly moving object in order to slow the object, or to provide control and stability, or as a pilot parachute to deploy a larger parachute...

, and spring. The pack tray includes a line bag for stowing suspension lines and an inner staging flap that holds the reserve parachute until sufficient tension is achieved through the bridle/pilot parachute assembly during deployment. The MIRPS pack tray is slightly larger than that of the T-10 reserve pack tray so it can accommodate a larger pilot chute
Pilot chute
A pilot chute is a small auxiliary parachute used to deploy the main or reserve parachute. The pilot chute is connected to the deployment bag containing the parachute by a bridle. On modern skydiving rigs three types of pilot chutes can be found:...

, spring, and bridle. The pack tray has a yellow stripe along the rip cord protector flap and is made of nylon textile materials commonly used to make parachute systems.
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