courtesy Ranjit Singh Sekhon ji Bailing Out ( Ejection Seat) Ejection seat (or ejector seat) is a system designed to rescue the pilot or other crew of an aircraft (usually military) in an emergency. When a crewmember lifts the pull handle or yanks the face curtain down on the ejection seat, it sets off a chain of events that propels the canopy away from the plane and thrusts the crewmember safely out. Ejecting from a plane takes no more than four seconds from the time the ejection handle is pulled. The exact amount of time depends on the seat model and the crewmembers body weight. Pulling the ejection handle on a seat sets off an explosive cartridge in the catapult gun, launching the ejection seat into the air. As the seat rides up the guide rails, a leg-restraint system is activated. These leg restraints are designed to protect the crewmembers legs from getting caught or harmed by debris during the ejection. An underseat rocket motor provides the force that lifts the crewmember to a safe height. Prior to the ejection system launching, the canopy has to be jettisoned to allow the crewmember to escape the cockpit. There are at least three ways that the canopy or ceiling of the airplane can be blown to allow the crewmember to escape: Lifting the canopy - Shattering the canopy - Explosive hatches - The seat, parachute and survival pack are also ejected from the plane along with the crewmember. Many seats have a rocket motor fixed underneath the seat. After the seat and crewmember have cleared the cockpit, this rocket will lift the crewmember another 100 to 200 feet (30.5 to 61 m), depending on the crewmembers weight. This added propulsion allows the crewmember to clear the tail of the plane. As of January 1998, there had been 463 ejections worldwide using the ACES II system, according to the U.S. Air Force. More than 90 percent of those ejections were successful. There were 42 fatalities. Once out of the plane, a drogue gun in the seat fires a metal slug that pulls a small parachute, called a drogue parachute, out of the top of the chair. This slows the persons rate of descent and stabilizes the seats altitude and trajectory. After a specified amount of time, an altitude sensor causes the drogue parachute to pull the main parachute from the pilots chute pack. At this point, a seat-man-separator motor fires and the seat falls away from the crewmember. The person then falls back to Earth as with any parachute landing. Ejection Tie Club:-As of 20 June 2011 – when two Spanish Air Force pilots ejected over San Javier airport – the number of lives saved by Martin-Baker products was 7,402 from 93 air forces. The company runs a club called the Ejection Tie Club and gives survivors a unique tie and lapel pin.The total figure for all types of ejection seats is unknown, but may be considerably higher. We run an exclusive Ejection Tie Club for all pilots that have used one of our ejection seats. Life membership of the Ejection Tie Club is confined solely to persons who have ejected from an aircraft, in an emergency, using a Martin-Baker ejection seat which has thereby saved their life. Pilots have successfully ejected from underwater in a handful of instances, after being forced to ditch in water. Documented evidence exists that pilots of the US and Indian Navies have performed this feat Then Commander Peter Debras who retired after rising to a flag rank of Indian navy was the pilot of Seahawk aircraft on Board INS Vikrant who successfully ejected Helmut Schenk, became the first person to escape from a stricken aircraft with an ejection seat on 13 January 1942 Picture 1. Getting set for ejection: Picture 2 and 3. The parachutes opening on a Martin-Baker ejection seat during a test. The small parachute at the top is called the drogue parachute. Photo courtesy NASA Picture 4.A warning applied on the cockpit side of all aircraft using an ejection seat system. Intended especially for the maintenance and emergency crews.
Posted on: Tue, 28 Oct 2014 11:12:07 +0000
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