line position will be displayed in degrees in the upper left
corner of the screen. The line will disappear approximately
15 seconds after the switch is released. It will then
automatically return to "0" degrees.
HOLD switch. Push type on/off switch.
When activated, the last image presented before pressing the
switch is displayed and held. The word HOLD will flash on
and off in the upper left corner of the screen. Pressing the
switch again will update the display and resume normal scan
Function switch. Controls operation of the
OFF. Turns set off.
STBY. Places set in standby mode. This
position also initiates a 90-second warm-up delay when first
TEST. Displays test pattern to check
for proper operation of the set. The transmitter is disabled
during this mode.
ON. Places set in normal operation.
MODE switches. Momentary action type
switches. Pressing and holding either switch will display an
information list of operational data on the screen. The data
heading will be in blue, all data except present data will be in
yellow, and present selected data will show in blue. The three
weather levels will be displayed in red, yellow, and green. If
WXA mode has been selected, the red bar will flash on and
off. If the switch is released and immediately pressed again,
the mode will increase or decrease depending on switch
pressed. When either top or bottom mode is reached, the
opposite switch must be pressed to further change the mode.
NAV switch. If pressed with the INS
operating and the weather radar operating in a weather
depiction mode, the screen will display INS waypoints that
are located within the range displayed and within the degree
of coverage left or right of the present heading of the aircraft.
BRT control. Used to adjust screen
Weather Radar Normal Operation.
Do not operate the weather radar set while
personnel or combustible materials are,
within 18 feet of the antenna reflector
When the weather radar set is operating,
high-power radio frequency energy is
emitted from the antenna reflector, which
can have harmful effects on the human
body and can ignite combustible materials.
Do not operate the weather radar set in a
confined space where the nearest metal
wall is 50 feet or less from the antenna
reflector. Scanning such surfaces may
damage receiver crystals.
Turn-on procedure: Function switch TEST or
ON, as required. (Information will appear after time delay
period has elapsed.)
Initial adjustment operating procedure:
BRT control As required.
MODE switches Press and release as
RANGE switches Press and release as
TILT control Move up or down to
observe targets above or below aircraft
level. The echo display will change in
shape and location only.
Function switch TEST.
RANGE switches- Press and release as
required to obtain 80-mile display.
BRT control As required.
Screen Verify proper display. (The test
display consists of two green bands,
two yellow bands, and a red band on a
120-degree scan. The word TEST will
be displayed in the upper