Helicopter Flight Information
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Helicopter Flight Information This domain is for sale. #1 in all relative searches, 12,000 views per month averaging 400 views per day! |
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Dynamic RolloverDynamic rollover is a condition that results from a lack of proper control by the pilot. There is no other reason for it, however there are conditions that lead to it. An interesting fact is that more than 90 percent of all dynamic rollover accidents occur by low-time pilots on level ground. Three conditions are necessary for dynamic rollover to occur; there must be main rotor thrust that equals helicopter weight, one skid must be in contact with the ground or a stationary object, and there must be an inappropriate lateral cyclic input (a rolling tendency about the skid which is in contact with the stationary object). It is imperative that all students, and all pilots obtain training that removes any fear of ground contact which commonly results in a pilot who quickly jerks the helicopter to a hover, and abruptly lands from a hover. A pilot with good technique can always land softly. Most cases of dynamic rollover occur when a low time pilot attempts to lift the helicopter into a hover while focused on the ground close to the aircraft rather than on the distant horizon as they should have been taught. As a result, they fail to notice that they had lateral cyclic applied, and they also fail to notice the rolling tendency as early as they would have if they had maintained a distant focus. Awareness involves knowing the necessary control position relative to the surface. This means that if you are taking off from level ground, then the controls must be centered. If you are taking off from sloping ground, then lateral cyclic must be applied into the slope, and this input is relative to the degree of the slope. Recognition is a rolling tendency about the skid that is in contact with the object or ground. The cause is an inappropriate lateral cyclic input while one skid is in contact with the ground or a stationary object while main rotor thrust equals helicopter weight. Correction is simply lowering the collective (this could mean full-down collective, but not necessarily). It is a fact that most dynamic rollover accidents occur by low time pilots (students) on level ground. Pilots landing on surfaces other than concrete or asphalt must be aware that when an incorrect lateral cyclic input is applied, the helicopter will roll rather than slide as it will on a hard surface. Low time pilots must use extreme caution when landing on soft surfaces. I forbid my students to make soft surface landings except in extenuating circumstances, until they have significant experience.
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