PH.VIII.I.K3
KnowledgeCorrective actions during low and normal rotor rpm speeds.
From the FAA library
- Chapter 11: Helicopter Emergencies and Hazards › Low-G Conditions and Mast Bumping
normal cruise speed. Turbulence (where high rotor flapping angles are already present), and higher airspeeds (where the controls are more sensitive) both increase susceptibility to low-G conditions. • Use a flight simulator to learn to recognize and experience low ... flapping clearances are exceeded, but because they retain some control authority at low G, occurrences are less common than for teetering rotors. Low Rotor RPM and Rotor Stall Rotor rpm is a critically important parameter for all helicopter operations. Just…
- Chapter 11: Helicopter Emergencies and Hazards › Low Rotor RPM and Rotor Stall
Other causes of a power-on low rotor rpm condition include the pilot rolling the throttle the wrong way in helicopters not equipped with a governor or a governor failure in helicopters so equipped. As the rpm decreases, the amount ... horsepower the engine can produce also decreases. Engine horsepower is directly proportional to its rpm, so a 10 percent loss in rpm due to overpitching, or one of the other scenarios above, will result in a 10 percent loss…
- Chapter 11: Helicopter Emergencies and Hazards › Autorotation
Following this general procedure of fitting airspeed and rotor rpm to existing conditions, a pilot can achieve approximately the same glide angle in any set of circumstances, and thereby estimate the touchdown point accurately. Figure 11-1. During an autorotation ... upward flow of relative wind permits the main rotor blades to rotate at their normal speed. In effect, the blades are “gliding” in their rotational plane. It is important that pilots experience autorotations from various airspeeds. This provides better understanding…
- Chapter 11: Helicopter Emergencies and Hazards › Ground Resonance
When another part of the landing gear strikes the surface, the unbalanced condition could be further aggravated. If the rpm is low, the only corrective action to stop ground resonance is to close the throttle immediately and fully lower ... collective to place the blades in low pitch. If the rpm is in the normal operating range, fly the helicopter off the ground, and allow the blades to rephase themselves automatically. Then, make a normal touchdown. If a pilot lifts…
- Chapter 4. Air Traffic Control › Section 4. ATC Clearances and Aircraft Separation › 4-4-12. Speed Adjustments
Instruct the pilot to “resume published speed.” Resume published speed is issued to terminate a speed adjustment where speed restrictions are published on a charted procedure. NOTE-When instructed to “comply with speed restrictions” or to “resume published speed ... anticipates pilots will begin adjusting speed the minimum distance necessary prior to a published speed restriction so as to cross the waypoint/fix at the published speed. Once at the published speed, ATC expects pilots will maintain the published speed until…