![]() ![]() Some skydivers wear a visual altimeter, and some use audible altimeters fitted to their helmets. Depending on the country, AADs are often mandatory for new jumpers, and/or required for all jumpers regardless of their experience level. Many skydivers use an automatic activation device (AAD) that opens the reserve parachute at a predetermined altitude if it detects that the skydiver is still in free fall. The reserve parachute must be periodically inspected and repacked (whether used or not) by a certified parachute rigger (in the US, an FAA certificated parachute rigger every 180 days). In the US and in most of the western world, skydivers are required to wear two parachutes. Once clear of the aircraft, the ejection seat will deploy a parachute, although some older models entrusted this step to manual activation by the seat's occupant. In most designs, this will lead to the seat being propelled out of and away from the aircraft, carrying the occupant with it, by means of either an explosive charge or a rocket propulsion system. Said system is usually operated by the pilot, aircrew member, or passenger by engaging an activation device manually. In modern times, the most common means of escape from an aircraft in distress is via an ejection seat. While this method of escape is relatively rare in modern times, it was occasionally used in World War I by German military aviators, and utilized extensively throughout the air wars of World War II. Manually exiting an aircraft and parachuting to safety has been widely used by aviators (especially military aviators and aircrew) and passengers to escape an aircraft that could not otherwise land safely. Occasionally, forest firefighters, known as " smokejumpers" in the United States, use parachuting as a means of rapidly inserting themselves near forest fires in especially remote or otherwise inaccessible areas. Special operations forces commonly employ parachuting, especially free-fall parachuting, as a method of insertion. Modern militaries utilise parachuting for the deployment of airborne forces and supplies. In 2018, there were 3.3 million jumps in the US. Parachuting is performed as a recreational activity and a competitive sport, and is widely considered an extreme sport due to the risks involved. Further information: Parachute ยง History Common uses ![]()
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