HI.XI.I.R6

From the FAA library

• Helicopter Flying Handbookp. 11-11
  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…

• Helicopter Flying Handbookp. 11-12
  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…

• Aviation Instructor's Handbookp. 9-7
  Chapter 9: Techniques of Flight Instruction › The Telling-and-Doing Technique › Instructor Tells—Instructor Does

  maintain altitude. Maintain coordinated flight by applying rudder in the direction of the turn. ⦁ Remember, the ailerons control the roll rate, as well as the angle of bank. The rate at which the aircraft rolls depends on how much aileron ... deflection is used. How far the aircraft rolls (steepness of the bank) depends on how long the ailerons are deflected, since the aircraft continues to roll as long as the ailerons are deflected. When the desired angle of bank…

• Helicopter Flying Handbookp. 11-13
  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…

• Helicopter Flying Handbookp. 11-13
  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…