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Refer to figure.
What should be considered when lined up on the departure runway and there are thunderstorms in the vicinity?
  • A
    The gain control (rotary switch 3) should be set to minimum (MIN) to ensure that all returns are displayed.
  • B
    The radar should be tilted up (UP) (rotary switch 2) to check for any significant precipitation on the climb-out path.
  • C
    The ground clutter suppression (GND CTLR SPRS) switch should be set to OFF to eliminate confusion with weather returns.
  • D
    The radar should be tilted down (DN) (rotary switch 2) to ensure ground returns are displayed to verify that the system is working.
"The gain control (rotary switch 3) should be set to minimum (MIN) to ensure that all returns are displayed." Incorrect.
  • Gain control should be left in CAL position for automatic gain control. The CAL position results in a calibrated map or weather radar display. Gain control does not affect turbulence or windshear.
"The radar should be tilted up (UP) (rotary switch 2) to check for any significant precipitation on the climb-out path." Correct.
  • Setting the tilt up would remove as far as possible the ground returns and would allow clouds in the climb out to be scanned. Tilting the antenna down would most likely result in only ground clutter being visible and would not point at clouds which will be above the aircraft.
"The ground clutter suppression (GND CTLR SPRS) switch should be set to OFF to eliminate confusion with weather returns." Incorrect.
  • The ground clutter suppression system will autoscan the clouds and ground in front of the aircraft and store those in a database. Repeated scans will allow the radar to decide the returns which are clouds and those which are ground. Selecting GCS will remove the ground clutter and turning it off would bring it back.

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