(4) Range Mark Numerics. Five labeled
range marks are displayed on each range. The fifth
range mark label is larger serving to identify the
selected range. Range and azimuth marks and
numerics are displayed in cyan for WX, CYC, and
TEST and in green for MAP.
To prevent electromagnetic radiation in
ramp, terminal, taxiway, or other areas
occupied by personnel, operate radar only
in standby mode.
Do not operate radar system, even in
standby mode, without 115-Vac, 400-Hz
power applied to the system. Without ac
power, the receiver-transmitter cooling
blower will not operate, which could result
(1) Before Turn On. Place the system
controls in the following positions before applying
power from the aircraft electrical system:
1. INT / OFF OFF (fully counter-
clockwise in detent)
2. GAIN PRESET
clockwise in detent)
3. TILT ±10 (fully clockwise)
4. STAB ON
5. TGT ALRT OFF
6. AZ MK OFF
performed If the radar system is to be operated in any
mode other than STBY or TEST while the aircraft is on
1. Direct nose of aircraft such that
antenna scan sector is free of large
metallic objects such as hangars or
other aircraft for a distance of 100 feet
(30 meters) and tilt antenna fully
2. Avoid operation during refueling of
aircraft or other refueling operations
within 100 feet (30 meters).
standing too close in the 270° forward
sector of the aircraft.
(3) Self-Test Displays. A distinctive test
pattern is displayed when the TEST function is
selected. The following procedures may be performed
to verify the operational status of the entire radar
1. Verify that the preliminary control
settings have been made and rotate
INT / OFF control to mid-point to turn
system on. Verify that STBY is
displayed in Mode field and that 100 is
displayed as selected range.
2. Press WX/C push button and verify
that WAIT is displayed in Mode field.
transmitter from operating and maintains
the display blanked until the magnetron
has warmed up. When the radar is turned
on by pressing the WX/C or MAP push
buttons, it will display WAIT and will be in
standby for the 1 minute warmup period,
then automatically become operational in
the selected mode.
If none of the push -button switches is
pressed, the radar will display STBY and
be in the standby mode.
3. Press the TEST push button and,
when the test pattern appears, verify
operation of the intensity control and
adjust to desired viewing level.
4. Observe the display; verify that TEST
is displayed in the Mode field and that
the test pattern exhibits the following
a. Range marks and alphanumerics
are displayed in cyan
b. Color bar and 1 2 3 are displayed
in auxiliary field
c. The colors of the first three target
bands are green, yellow, and red