Russian and Chinese made seats have proved to be nearly as reliable as the Western ones. Newer ejection seat designs are also modified so that they are much easier to install and remove from aircraft, saving several man hours per removal or installation. Martin-Baker supplies about two-thirds of the ejection seats for Western fighter aircraft including the F-35. Ejection seats, like cockpits in general, are built to accommodate a limited range (in terms of weight and size) of pilots. A recent modification has been made to handle the heavier HMDS helmets. Experience with the manually operated seats had shown that a number of fatalities had occurred, due to unconsciousness after ejection, inaction due to circumstantial stress, or lack of time to carry out the necessary manual operations when ejecting at low altitudes. Starting in 2017 the hundred or so F-35As with the unmodified ejection seats were upgraded at the rate of about 14 a month. And it's one of the safest ejection seats ever made. But all ejection seats are vulnerable to poor maintenance, which has been found to be the most common cause of ejection seat use fatalities.For example, in 2017 the U.S. Air Force accepted a modification to the US16E ejection seat used in its F-35A fighters. ejection fatalities are caused by “out of the envelope” ejection, i.e., too c lose to the ground or with an excess, downward aircraft vector. In the time -frame 1981-1984, … The rocket motor controls and stabilization system makes it less likely that the ejection seat will hit the tail of the aircraft or land at a bad (for the pilot) angle. With the higher speed, there was the danger of hitting the tail. This enabled the Russians to make smaller tanks. The restrictions were more common in aircraft, especially fighter aircraft. If Martin-Barker has to modify the MK16 seat again the actual engineering changes are not the main problem but the time and expense required to verify that the modified seat works reliably.Historically aircraft, and other military equipment were designed to handle people of only a certain weight and size. In Russia (and a few other countries) this extended to armored vehicles, especially tanks, where only the short of stature (and muscular, especially if you were the gun loader) could serve in tank crews. These used compressed air to propel the seat out of the aircraft. Actually, there is some risk for any pilots weighing less than 75 kg (165 pounds). Most ejection seats weigh about half a ton and are complex bits of technology. Some seat models have added a new parachute design that descends more slowly thus reducing the number of parachute related ejection seat landing issues. The first real use was on July 29 1946. This is particularly important for female pilots. Now all F-35 seats can accommodate pilots weighing from 46.4 kg (102 pounds) to 111.3 kg (245 pounds.) The first ejection seat design was developed in Germany where the seats were first installed in their He 219 night fighters during 1943.
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