POF, Aircraft icing, General knowledge, Wx Brief Flashcards
What is vortex ring state?
A flight condition where a helicopter descends more than 500 fpm and an airspeed less than 15 KT. It causes the rotor downwash vortices to recirculate into the disk, creating a greater descent as more power is applied.
What is retreating blade stall?
A condition occurring in helicopters where the retreating blade experiences a stall due to insufficient lift. Usually occurs near or at Vne, due to dissymetry of lift
What is overpitching?
What is settling with max available power?
What is mast bumping?
What is mast rocking?
A condition where the mast of a helicopter moves back and forth, affecting stability and control. Also Known as chugging, can happen with a high gross weight and a c of g near the forward limit
What atmospheric conditions are conducive to airframe icing?
Conditions with visible moisture and temperatures near or below freezing
What are the implications of flying into a warm front from the cold side?
What are the symptoms you will encounter as airframe icing builds?
Reduced lift, increased drag, and potential control difficulties, rotor vibrations from uneven shedding of ice from the blades
What actions would you take to avoid icing conditions?
Avoid flying in visible moisture at temperatures near freezing and seek warmer air. Alter flight path
How would you shed icing from the rotor blades?
Use de-icing systems or perform a controlled descent to reduce ice build-up, maintain rotor rpm to allow centrifugal forces to shed ice
Explain Indicated Altitude, Pressure Altitude, Density Altitude, True Altitude, Absolute Altitude.
Indicated Altitude: altitude shown on the altimeter
Pressure Altitude: altitude based on standard pressure;
Density Altitude: altitude corrected for temperature and pressure;
True Altitude: actual height above sea level;
Absolute Altitude: height above the terrain.
Explain IAS, CAS, TAS, G/S.
IAS: read from the airspeed indicator
CAS: airspeed corrected for instrument error
TAS: speed of the aircraft relative to the air it’s flying through.
G/S: actual speed over the ground
Discuss Instrument and Compass errors.
What are semi-circular tracks?
What questions are related to METAR/TAF/GFA?
Practice METAR, TAF and GFA readings
