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ATPL Radio Navigation > Weather Radar > Flashcards

Weather Radar Flashcards

1
Q

Is weather radar required on board

A

Yes

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2
Q

Is stormscope a weather radar

A

No!

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3
Q

What is the frequency / wavelength of weather radar

A

9 GHZ

3 cm

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4
Q

How is the weather radar stabilised

A

Arial gyro stabilised in pitch

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5
Q

What type of radar dish is weather radar

A

Spotted array

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6
Q

What is a pencil beam for weather detection

A

3° - 5° beam width

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7
Q

What is a cosecant squares beam (spoiled beam)

A

Ground mapping

50-80nm in front

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8
Q

How is turbulence detected

A

Doppler

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9
Q

What does black represent on weather radar

A

No / very little precipitation and very small water droplets

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10
Q

What does green represent on weather radar

A

Light precipitation and small size droplets giving light turbulence

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11
Q

What does amber represent on weather radar

A

Medium precipitation
Medium size droplets
Medium turbulence

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12
Q

What does red represent on weather radar

A

Heavy precipitation
Large size droplets
Medium to severe turbulence

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13
Q

On mapping mode what does black represent

Radar

A

Water

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14
Q

What does green represent on mapping mode

Radar

A

Land

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15
Q

What does amber represent on mapping mode

Radar

A

High ground
Large settlements
Cities

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16
Q

What is gain control on radar

A

Sensitivity

17
Q

What is stabilised tilt control on radar

A

Value of tilt in relation to the horizon

18
Q

What is un-stabilised tilt control

A

Values of tilt in relation to longitudinal axis

19
Q

What (in descending order) is the reflectivity of different weather on radar returns

A 
Wet hail 
Large / medium water droplets 
Wet snow
Drizzle
Dry hail
Dry snow
20
Q

Where is dry hail most likely to be found

A

Top of CBs

21
Q

What should be the procedure for weather radar on the ground

A

Use with extreme caution

Damaging to people

Don’t switch on until on runway

22
Q

How should the weather radar be tilted for takeoff / climb

A

Initially about 4° then reducing with reducing climb angle

23
Q

How should weather radar be tilted for cruise

A

Neutral or slightly down

24
Q

How should weather radar be tilted for descent / approach

A

Down to see what’s being flown into

When lower = reduce down or else ground returns

25
Q

What does ground mapping on weather radar show

A

Water
Coastlines
Hills mountains
Larger settlements

Limited navigation assistance

26
Q

How does windshear detection work

A

Only at low alt

Using Doppler shift

ATPL Radio Navigation (14 decks)

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