Weather radar(WXR)

Question 1

This radar is pretty advanced. Explain Ground Clutter Suppression(GCS) function!!

Answer 1

GCS uses terrain database information to evaluate returns at different angles. The WXR returns, below a predetermined threshold level, are eliminated to remove ground clutter from the weather displays.

*the WXR removes unnecessary returns and available in Auto Mode only

Question 2

Explain the overflight protection function on the WXR!!

Answer 2

When the aircraft is approx 15nm from the storm cells, the overflight protection function uses the latest radar scans from the WXR memory to display the significant weather, until behind the aircraft.

Question 3

Explain the Path Attenuation Compensation function(PAC)!!

Answer 3

Corrects for radar beam absorption as it penetrates precipitation, up to 80nm ahead of aircraft.

*available in Auto Mode only.

Question 4

Explain some of the compensations that the WXR takes into account in Auto Mode!!

Answer 4

The WXR systems compensates for variations in temperature, geographic location, time of day, and altitude.

Question 5

Explain the difference between Oceanic weather cells compared to Continental.

Answer 5

Oceanic weather cells tend to have less mass and reflectivity than continental cells of equivalent height.

Question 6

With the difference in Oceanic and Continental, in Auto Mode, what does the WXR automatically do?

Answer 6

Automatically adjusts gain and tilt in Oceanic regions to more accurately depict weather cells.

Question 7

True or False:

Radar shouldn’t be turned on with people nearby, or when aircraft is near buildings?

Answer 7

True

Question 8

How far out does Turbulence mode(TURB) display precipitation related turbulence?

Answer 8

40nm maximum

Question 9

True or False:

WXR detects Clear Air Turbulence(CAT)?

Answer 9

False

Question 10

At what altitude does Overflight Protection become active?

Answer 10

22,000 feet MSL

*below 22,000 the protection deactivates.

Question 11

What alert automatically removes WXR display for clarity?

Answer 11

TAWS alert.

Question 12

Explain the predictive wind shear function!!

Answer 12

Uses WXR information to predict wind shear conditions during takeoff and approach.

Question 13

When is wind shear detection active?

Answer 13

In STBY, or in TEST mode.

Question 14

True or False:

The wind shear aural alert has priority over all other ground proximity aural alerts?

Answer 14

True