aircraft icing Essay

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Introduction
Plane crashes occur for a number of reasons. There seems to be a consensus with the general public that flying is dangerous, engines fail and planes crash. That is true some times, although the majority of plane crashes occur largely due to a combination of human error and mechanical failure. In much of aviations accidents mechanical failure has been a contributing factor. It is impossible however to blame plane crashes on one reason since events leading up to an accident are so varied. Reasoning for plane crashes can be placed in a broad number of categories.
Environmental conditions play a vital part in aviation as a whole. Much planning goes into a flight based on the current and forecast weather conditions for safety
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The NTSB investigation concluded that the combination of the crew's use of thrust reverse on the ground for push back, and their failure to active the engine anti-ice system caused the crash. By failing to activate the engine anti-ice system, large amounts of snow and ice that were sucked into the engines during reverse thrust were allowed to remain there. Ice built up on the compressor inlet pressure probe, which measures engine power. As a result instrument indications in the cockpit showed an Engine Pressure Ratio of 2.04, while the power plants were in reality only producing 1.70 EPR, or about 70% of available power. The combination of the ice covered wings and low power caused an immediate stall on takeoff killing 74 people. (Kilroy, 9).
In Americans Eagle Flight 4184 October 31, 1994, heavy air traffic and poor weather postponed the arrival of this flight at Chicago's O'Hare International Airport, where it was to have landed en route from Indianapolis, Indiana.
The ATR-72, a twin-engine turboprop carrying 68 people, entered a holding pattern 65 miles southeast of O'Hare, which it maintained for over an hour in freezing rain. As the plane circled, a ridge of ice formed on the upper surface of its wings, eventually causing the aircraft's autopilot to suddenly disconnect and the pilots to lose control. The ATR disintegrated on impact with a field below, killing everyone aboard. Following an NTSB…

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