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
blower will not operate, which could result
The following paragraphs provide the procedures
utilizing the capabilities of the NAV function. These
paragraphs are presented in sequential order from
initialization to a composite navigation display.
For the purpose of explanation, only NAV 1
controls and symbols are addressed in the following
procedures, except for the composite selection.
(a) Initial Entry.
1. Turn on radar set and external
compass, DME, radio, etc.).
2. Set rotary switch to NAV and
observe that disclaimer notice
displays and remains until any
NAV switch is changed.
3. With no selections made on the
control unit, the only display is the
magnetic heading readout. If, for
some reason, the compass is
inoperative, the three digits are
replaced with dashes.
(b) NAV 1/DES NAV Selection.
1. Tune in desired VOR stations to
be used as NAV 1 and NAV 2.
2. Place DES NAV 1 / NAV 2 switch
to NAV 1.
3. Press NAV 1 push button and
note that green VOR symbol,
distance, bearing, and station ID
readouts display. If DES NAV 1 /
NAV 2 switch is placed to NAV 2,
the VOR symbol remains, but
designator readouts disappear.
This assumes that the station is located in
the area shown on the display. The ID
readout will not appear until acquired by
the DME receiver, this may take up to
(c) NAV 1 / HDG Selection.
1. Press HDG push button and note
2. The selected heading line may
now be moved by rotating the
HDG knob on the HSI.
The operator must compare the heading
error line display to the HSI heading bug to
ensure that the display is in the correct
quadrant. The display is correct only for
heading errors less than 60º.
(d) NAV 1 / CS 1 Selection. Press the
CS 1 push button and note that a green course line
through the NAV 1 station symbol has been added to
the display of the preceding paragraph. Note that the
green CRS, bearing, and station ID appear in the
lower left corner of the display.
(e) NAV 1 / DES Selection.
1. Rotate RAD control to position
2. Hold DES IN / OUT switch in OUT
symbol to desired position.
connecting line are displayed from
the station symbol, and that S-D
data and A-D data appear in the
upper left and lower right corners,
respectively, of the display.
4. The designator may be homed to
the selected NAV station symbol
by pressing HOME push button;
note that when pressed, the S-D
readout is now all zeros.