Table 3A-2. EFIS Display Color Codes
TYPE OF INFORMATION
Cautions or abnormal source;
Cross-side navigation data;
Cross-side commanded data;
Cross-side selected active route/
On-side approach and navigation
On-side commanded data;
Selected active route/flight plan
Scales and associated figures;
Held DME distance display
On-side non-approach navigation
Performing the EFIS self test is not
required at any time. If a failure exists, the
small red SG in a red box is displayed. The
self-test is intended to familiarize the pilot
with the display flags, and for checking
proper display color.
1. BRT control Set desired brightness.
2. TST / REF push-button switch Press for
3 seconds. A SELF TEST PASS or SELF
TEST FAIL message will be annunciated.
White on the compass scale indicates that
all three colors are operational in the
3A-18. EFIS STANDBY POWER SYSTEM.
The EFIS standby power system provides
standby electrical power for EFIS system operation
when aircraft electrical power is unavailable. The
EFIS standby power system control panel is located
on the instrument panel. A push-button switch on the
control panel, placarded TEST, initiates self test. A
switch indicator, placarded ARM TEST on the top half
and ARM on the bottom half, is used to select or
deselect the armed condition of the system, indicates if
self test is in progress, and indicates whether or not
the system is armed or not. The standby EFIS power
system is protected by a 15-ampere circuit breaker,
placarded EFIS AUX BAT, located on the right
sidewall circuit breaker panel, Figure 2-6.
3A-19. EFIS CONTROL PANEL.
a. Description. The EFIS control panel
enables each pilot to control formatting on his
respective EHSI and EADI and to select the source of
navigation, attitude, and heading information. Refer to
b. EFIS Control Panel Controls, Indicators,
(1) Radio Altimeter Decision Height Set
Knob. The radio altimeter decision height set knob,
placarded DH, is used to set the desired decision
height in feet that is shown in the green DH display
located in the lower left comer of each EADI. To set
the decision height, pull out the knob and then turn it
clockwise to increase the selected decision height or
counterclockwise to decrease the selected decision
height. The decision height set knob is variable rate;
that is, turning the knob farther in either direction will
increase the rate of change in selected decision
height. The decision height selection range is from
OFF (-1 foot) to 2500 feet.
Push the DH knob back in after the decision
height has been set to lock the selected DH altitude. If
the DH is set to OFF the DH annunciator will not be
displayed on the EADI.
(2) HSI 360 Degree Push-Button Selector
Switch. The HSI 360 push-button selector switch,
placarded HSI, is used to select one of four possible
360° formats for the HSI. Each press of the HSI
switch sequences to the next display format. The four
possible 360° HSI formats are Standard HSI compass
rose; Navigation map; Navigation map with weather
radar display, and Directional gyro mode.
(3) Radio Altimeter Push-Button Test Switch.
Pressing the radio altimeter test switch, placarded
RALT TST, provides a discrete output to the radio
altimeter initiating its self-test function.