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roll over
- Sinônimos
- taxiing
- Fonte1
- FEDERAL AVIATION ADMINISTRATION. Helicopter flying handbook (FAA-H8083-21A). Washington, DC: FAA, 2012.
- Fonte2
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Manual of aircraft accident and incident investigation. Montreal, 2014. (Doc. 9756)
- Nota adicional1
- The helicopter will roll over if landing or takeoff is continued after cyclic limits are reached during slope operations.
- Contexto
- A Robinson R22 Beta rolled over during landing in a field.
- The collective should not be pulled suddenly to get air- borne, as a large and abrupt rolling moment in the opposite direction could occur. Excessive application of collective can result in the upslope skid rising suffi- ciently to exceed lateral cyclic control limits. This movement may be uncontrollable. If the helicopter develops a roll rate with one skid/wheel on the ground, the helicopter can roll over on its side.
- Dynamic rollover is the occurrence of a rolling motion introduced by a lateral component of main rotor thrust. When the helicopter touches the surface with one side of the landing gear, the aircraft may begin rolling and may get to the point where it cannot be controlled. During normal or slope takeoffs and landings while any part of the landing gear, skid or wheel, is acting as a pivot, a moment is produced by the lateral component of the main rotor thrust about the point of surface contact. Normally, the rolling moment is opposed by the position of the weight of the aircraft between the wheels or skids. The opposing moment to the rolling motion decreases as the aircraft rolls to progressively steeper bank angles while maintaining contact with the surface. The helicopter will reach a bank angle beyond which it is impossible to stop further rolling motion. If the helicopter remains in contact with the surface, it will roll over onto its side. The angle beyond which this is likely to happen is called the critical roll angle. The rate at which the initial rolling motion takes place significantly influences the critical roll angle.
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