Weather Radar Flashcards
Is weather radar required on board
Yes
Is stormscope a weather radar
No!
What is the frequency / wavelength of weather radar
9 GHZ
3 cm
How is the weather radar stabilised
Arial gyro stabilised in pitch
What type of radar dish is weather radar
Spotted array
What is a pencil beam for weather detection
3° - 5° beam width
What is a cosecant squares beam (spoiled beam)
Ground mapping
50-80nm in front
How is turbulence detected
Doppler
What does black represent on weather radar
No / very little precipitation and very small water droplets
What does green represent on weather radar
Light precipitation and small size droplets giving light turbulence
What does amber represent on weather radar
Medium precipitation
Medium size droplets
Medium turbulence
What does red represent on weather radar
Heavy precipitation
Large size droplets
Medium to severe turbulence
On mapping mode what does black represent
Radar
Water
What does green represent on mapping mode
Radar
Land
What does amber represent on mapping mode
Radar
High ground
Large settlements
Cities
What is gain control on radar
Sensitivity
What is stabilised tilt control on radar
Value of tilt in relation to the horizon
What is un-stabilised tilt control
Values of tilt in relation to longitudinal axis
What (in descending order) is the reflectivity of different weather on radar returns
Wet hail Large / medium water droplets Wet snow Drizzle Dry hail Dry snow
Where is dry hail most likely to be found
Top of CBs
What should be the procedure for weather radar on the ground
Use with extreme caution
Damaging to people
Don’t switch on until on runway
How should the weather radar be tilted for takeoff / climb
Initially about 4° then reducing with reducing climb angle
How should weather radar be tilted for cruise
Neutral or slightly down
How should weather radar be tilted for descent / approach
Down to see what’s being flown into
When lower = reduce down or else ground returns
