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In aviation safety, parts departing aircraft or parts detached from aeroplanes (PDA), also known as objects falling off airplanes (OFA), things falling off aircraft (TFOA), and other analogous variations, can range from small fasteners like screws and rivets up to major sub-assemblies like hatch covers and doors. [1]
Foreign object damage to the compressor blades of a Honeywell LTS101 turboshaft engine on a Bell 222, caused by a small bolt that passed through the protective inlet screen FOD deflection system on a PT6T installed on a Bell 412. Air enters from upper right, and pure air follows the curved ramp down to the compressor inlet (also covered by a ...
The Haddon Matrix is the most commonly used paradigm in the injury prevention field. Developed by William Haddon in 1970, the matrix looks at factors related to personal attributes, vector or agent attributes and environmental attributes; before, during and after an injury or death. By utilizing this framework, one can then think about ...
Airborne leaflets have been used for military propaganda purposes at least since the 19th century. One early example is from the Franco-Prussian War when, in October 1870 during the Siege of Paris, a French balloon coming from the city dropped government proclamations over North German Confederation troops that stated the following (in German):
An unguided 500 lb (230 kg) Mark 82 bomb with no retarder An unguided bomb, also known as a free-fall bomb, gravity bomb, dumb bomb, or iron bomb, is an aircraft-dropped bomb (conventional or nuclear) that does not contain a guidance system and hence simply follows a ballistic trajectory.
Water causes damage and results from natural occurrences, technological hazards, or mechanical failures. Many cases of water damage can be traced to accidents or neglect. "A great many of the materials that museum objects are made of are highly susceptible to contact with water and can be severely damaged by even brief contact, while others may be exposed to water for longer periods without harm.
Based on T.P. Wright's original work on the man-machine-environment triad [3] at Cornell University, the 5M model incorporates a diagram of 3 interlocking circles and one all-encompassing circle.
An object dropped at the top of a drop tube. An object thrown upward or a person jumping off the ground at low speed (i.e. as long as air resistance is negligible in comparison to weight). Technically, an object is in free fall even when moving upwards or instantaneously at rest at the top of its motion.