AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
REVISION 39
2-18-75
Page
15
Code
01
AOM-145/1114
3 - AMBIENT LIGHT SENSOR
− Senses the lighting conditions around the control panel and
maintains the display screen intensity set by the BRT+ and
DIM- keys.
4 - HGS OPERATIONS MODE SELECTOR BUTTON
− Selects the mode of operation shown on the standby display
line as the active mode.
5 - STANDBY MODE SELECTOR BUTTON
− Shows available modes.
6 - RUNWAY DATA ENTRY SELECTOR BUTTON
− Activates Runway Data Entry mode to enter the runway
elevation or length.
7 - GLIDESLOPE DATA ENTRY SELECTOR BUTTON
− Activates the Glideslope Data Entry mode to enter the
glideslope angle.
8 - FAULT ANNUNCIATOR LAMP
− Indicates a fault in the critical processing path detected by the
HGS’ built-in test (BIT) function.
9 - CLEAR FUNCTION SELECTOR BUTTON
− Press to clear symbology from Combiner display. Press again to
display symbology. During data entry, button is used as
backspace and in the TEST mode, used to navigate the
displayed menus.
10 - DISPLAY SCREEN INTENSITY CONTROLS
− The BRT+ button increases display intensity and the DIM-
button decreases intensity.
11 - ENTER BUTTON
− Used to enter desired runway and glideslope values. In TEST
mode, selects items in the Test Menu.
12 - HGS TEST BUTTON
− With the airplane on the ground, starts or stops HGS test
functions and displays.
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