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Quality Control is monitoring routinely the status of the spacecraft (payload and platform) and to check if the derived products meet the quality requirements along mission life-time. Learn about the quality control activities for the ETM instrument:
When engaging slow or straight-receding targets, the operator tracks the target with the iron sights in the launch tube and applies half-trigger. This action "uncages" the seeker and allows its attempt to track. If a target IR signature can be tracked against the background present, this is indicated by a light and a buzzer sound. The shooter then pulls the trigger fully, and immediately applies lead and superelevation. This method is called a manual engagement. An automatic mode, which is used against fast targets, allows the shooter to fully depress the trigger in one pull followed by immediate lead and superelevation of the launch tube. The seeker will uncage and will automatically launch the missile if a strong enough signal is detected.
Once the missile is five and a half meters away from the gunner, c. 0.3 seconds after leaving the launch tube, it activates the rocket sustainer motor. The sustainer motor takes it to a velocity of 430 metres per second (1,400 ft/s; 960 mph), and sustains it at this speed. Once it reaches peak speed, at a distance of around 120 metres (390 ft) from the gunner, the final safety mechanism is disabled and the missile is fully armed. All told, the booster burns for 0.5 second and the driving engine for another 2.0 seconds.[11]
A Strela 2 was reportedly used by the Islamist militant group Ansar Bait al-Maqdis to destroy an Egyptian military Mil-8 helicopter operating in the northern Sinai region on 26 January 2014 near Sheikh Zuweid (close to the border with Gaza), killing its five occupants. This is the first attack of this type during the Sinai insurgency, which has raged on the peninsula due to the security and political turmoil since the 2011 revolution. The MANPADS is reported by United Nations to have come from former Libyan leader Muammar Gaddafi's large stocks, which have been widely proliferated after Libya's civil war chaos and have become a concern to regional and world security.[15]
During the civil war, several Strelas have made their way to rebel hands, and YouTube videos have shown them being fired. In 2013, Foreign Policy, citing rebels sources, reported the shipment, with Qatari help, of some 120 SA-7s from Libya (with large stocks acquired by Gaddafi and proliferated after that country's civil war) through Turkey and with Turkish authorities' knowledge[19][20]
During the Rhodesian Bush War, members of the military wing of the Zimbabwe People's Revolutionary Army brought down two Vickers Viscount civilian airliners near Kariba; the first in September 1978, the second in February 1979. There was great loss of life in both instances as the flights were returning from a well known tourist attraction.[67]
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