N
KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
Page 3-1
006-10536-0010 Rev. 10 Oct/2005
SECTION III
OPERATION
3.1 GENERAL
The KNI 415 and KNI 416 Radar Altimeter Indicators are shown in FIGURE 3-
1 KNI 415 CONTROL FUNCTIONS and FIGURE 3-2 KNI 416 CONTROL FUNCTIONS and
are discussed below.
• Altitude Scale:
The KNI 415 scale gives accurate altitude indications from -20 to +2000
feet. From -20 to 500 feet each mark on the scale represents 10 feet.
From 500 to 2000 feet, each mark represents 100 feet.
The KNI 416 scale gives accurate altitude indications from -10 to +2000
feet. From -10 to 200 feet each mark represents 5 feet, from 200 to
500 feet each mark represents 20 feet, and from 500 to 2000 feet each
mark represents 100 feet.
• Indicator Needle:
The AGL altitude in feet is displayed beneath this needle. Needle will
be clockwise behind mask when above 2000 feet.
• Flag:
Indicates invalid altitude information is being displayed or self test
button is depressed.
• Self Test Button:
This button is used to test the Radar Altimeter R/T and indicator. When
the button is depressed, the flag will come into view and 50 ± 5 feet
will be displayed.
• DH Knob:
This knob controls the DH (Decision Height) bug. By turning it clock-
wise, the DH bug will increase in altitude; counterclockwise, the bug
will decrease in altitude.
• DH Bug:
Indicates altitude during an approach at which the DH lamp will light.
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