PH.VIII.H.R6
Risk managementCritical rollover angle and rolling moment.
From the FAA library
- Chapter 11: Helicopter Emergencies and Hazards › Dynamic Rollover
critical rollover angle is exceeded, the helicopter rolls on its side regardless of the cyclic corrections made. Figure 11-4. Ground resonance. Dynamic rollover begins when the helicopter starts to pivot laterally around its skid or wheel. For dynamic rollover ... occur the following three factors must be present: 1. A rolling moment 2. A pivot point other than the helicopter’s normal CG 3. Thrust greater than weight This can occur for a variety of reasons, including the failure…
- Chapter 11: Helicopter Emergencies and Hazards › Dynamic Rollover › Critical Conditions
Critical Conditions Certain conditions reduce the critical rollover angle, thus increasing the possibility for dynamic rollover and reducing the chance for recovery. The rate of rolling motion is also a consideration because, as the roll rate increases, there ... reduction of the critical rollover angle at which recovery is still possible. Other critical conditions include operating at high gross weights with thrust (lift) approximately equal to the weight. Refer to Figure 11-5. The following conditions are most critical…
- Chapter 17: Aeromedical Factors › Health and Physiological Factors Affecting Pilot Performance › Diving or Rolling Beyond the Vertical Plane
Diving or Rolling Beyond the Vertical Plane This maneuver may produce extreme disorientation. While in straight-and-level flight, the pilot should sit normally, either with eyes closed or gaze lowered to the floor. The instructor pilot starts a positive ... coordinated roll toward a 30° or 40° angle of bank. As this is in progress, the pilot tilts his or her head forward, looks to the right or left, then immediately returns his or her head to an upright position…
- Chapter 11: Helicopter Emergencies and Hazards › Dynamic Rollover › Normal Takeoffs and Landings
Normal Takeoffs and Landings Dynamic rollover is possible even during normal takeoffs and landings on relatively level ground, if one wheel or skid is on the ground and thrust (lift) is approximately equal to the weight of the helicopter ... takeoff or landing is not performed properly, a roll rate could develop around the wheel or skid that is on the ground. When taking off or landing, perform the maneuver smoothly and carefully adjust the cyclic so that no pitch…
- Chapter 11: Helicopter Emergencies and Hazards › Dynamic Rollover › Precautions
cause the helicopter to bounce off the upslope skid or wheel, and the inertia can cause the helicopter to roll about the downslope ground contact point and over on its side. [Figure 11-7] Figure 11-6. Upslope rolling motion ... conditions on a slope, the collective should not be pulled suddenly to get airborne because a large and abrupt rolling moment in the opposite direction could occur. Excessive application of collective can result in the upslope skid or wheel rising…