PH.VIII.H.R1
Risk managementSurface conditions conducive to dynamic rollover.
From the FAA library
- Chapter 11: Helicopter Emergencies and Hazards › Dynamic Rollover
Dynamic Rollover A helicopter is susceptible to a lateral rolling tendency, called dynamic rollover, when it is in contact with the surface during takeoffs or landings. For dynamic rollover to occur, some factor must first cause the helicopter to roll ... pivot around a skid or landing gear wheel, until its critical rollover angle is reached. The angle at which dynamic rollover occurs will vary based on helicopter type. Then, beyond this point, main rotor thrust continues the roll and recovery…
- 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 11: Aircraft Performance › Takeoff and Landing Performance › Water on the Runway and Dynamic Hydroplaning
Water on the Runway and Dynamic Hydroplaning Water on the runways reduces the friction between the tires and the ground and can reduce braking effectiveness. The ability to brake can be completely lost when the tires are hydroplaning because ... layer of water separates the tires from the runway surface. This is also true of braking effectiveness when runways are covered in ice. When the runway is wet, the pilot may be confronted with dynamic hydroplaning. Dynamic hydroplaning…
- Chapter 11: Helicopter Emergencies and Hazards › Dynamic Rollover › Precautions
When the upslope skid or wheel hits the ground, the dynamics of the motion can 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. Under normal conditions on a slope, the collective should not be pulled suddenly to get airborne because a large and abrupt rolling moment…
- Chapter 11: Helicopter Emergencies and Hazards › Low-G Conditions and Mast Bumping
lower the collective and check to see if the downslope skid or wheel is caught on something. Under these conditions, vertical ascent is the only acceptable method of lift-off. 12. Be aware that dynamic rollover can be experienced during ... operating from floating platforms should also exercise great caution concerning cranes, masts, nearby boats (tugs) and nets. Low-G Conditions and Mast Bumping “G” is an abbreviation for acceleration due to the earth’s gravity. A person standing…