On the Horizontal Indicator, which control sets the RADAR warning minimum altitude on the radar altimeter's secondary display?

On the Horizontal Indicator, which control sets the RADAR warning minimum altitude on the radar altimeter's secondary display?

• A. The ADF power switch
• B. PUSH TO TEST on the Height Indicator
• C. The TACAN mode selector
• D. RADAR WARN ALT pushbutton switch on the Horizontal Indicator

Answer: (D)

The thing being tested is how you configure the radar warning threshold for the radar altimeter. The control that sets the radar warning minimum altitude on the radar altimeter’s secondary display is the RADAR WARN ALT pushbutton switch on the Horizontal Indicator. When you activate it, you select and set the minimum altitude that will trigger the radar warning on the secondary display, giving the crew a warning at the chosen height. The other controls don’t affect this setting: the ADF power switch handles the Automatic Direction Finder radio, not altitude warnings; PUSH TO TEST on the Height Indicator is for testing the height indicator; the TACAN mode selector is for navigation channels.

The thing being tested is how you configure the radar warning threshold for the radar altimeter. The control that sets the radar warning minimum altitude on the radar altimeter’s secondary display is the RADAR WARN ALT pushbutton switch on the Horizontal Indicator. When you activate it, you select and set the minimum altitude that will trigger the radar warning on the secondary display, giving the crew a warning at the chosen height.

The other controls don’t affect this setting: the ADF power switch handles the Automatic Direction Finder radio, not altitude warnings; PUSH TO TEST on the Height Indicator is for testing the height indicator; the TACAN mode selector is for navigation channels.