Commercial Pilot for Rotorcraft Category Helicopter Rating › VIII. Emergency Operations › Task J. Low Gravity (G) Recognition and Recovery

CH.VIII.J.R3

Risk management

Control inputs that cause mast bumping.

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Get a short, cited explanation of this element written from the FAA handbooks: the core idea, the numbers that matter, common test traps, and a quick self-check.

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Helicopter Flying Handbook p. 11-14
Chapter 11: Helicopter Emergencies and Hazards › Low-G Conditions and Mast Bumping
traditional recovery from vortex ring state, forward cyclic maneuvers do not cause low G and are safe to perform. However, an abrupt forward cyclic input or pushover in a two-bladed helicopter can be dangerous and must be avoided, particularly ... rotor hub. This results in the hub contacting the rotor mast, which is known as mast bumping. [Figure 11-8] Low-G mast bumping has been the cause of numerous military and civilian fatal accidents. It was initially encountered during…
Helicopter Flying Handbook p. 10-8
Chapter 10: Advanced Flight Maneuvers › Slope Operations › Technique
starts sliding down the slope. Use antitorque pedals as necessary throughout the landing for heading control. Before reducing the rpm, move the cyclic control as necessary to check that the helicopter is firmly on the ground. Common Errors 1. Failing ... into the slope. 5. Lowering the downslope skid or wheel too rapidly. 6. Applying excessive cyclic control into the slope, causing mast bumping…
Helicopter Flying Handbook p. 11-16
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 ... other scenarios above, will result in a 10 percent loss in the engine’s ability to produce horsepower, making recovery even slower and more difficult than it would otherwise be. With less power from the engine and less lift from…
FAA Aeronautical Chart Users' Guide p. 82
IFR ENROUTE LOW / HIGH ALTITUDE SYMBOLS (U.S., PACIFIC AND ALASKA CHARTS) › AIRSPACE INFORMATION
NAVAID or Fix Note: Not shown on joint Victor/RNAV or Jet/RNAV Routes. VHF/UHF LF/MF MINIMUM ENROUTE ALTITUDE (MEA) RNAV LOW CHARTS LOW CHARTS All Altitudes Are MSL Unless Otherwise Noted. LOW CHARTS Directional MEAs HIGH CHARTS HIGH CHARTS HIGH CHARTS ... shown on IFR High Altitude Charts when MEA is other than 18,000’. aircraft MEA for DME/DME/IRU RNAV aircraft LOW CHARTS MINIMUM ENROUTE ALTITUDE (MEA) GAP N/A MEA is established when there is a gap in navigation signal coverage. HIGH…