OPERATIONS MANUAL

Navigation Systems
Weather Radar System:
(There are various models of weather radar systems and panels. In the simulator,
all aircraft are fitted with the system and panel discussed in this chapter.)
Captain’s tilt and gain selectors
TILT Effective in manual mode
only. Sets the antenna
tilt angle with reference
to the earth’s horizon
(gyro stabilized), or with
reference to the aircraft
attitude when the gyro
system has failed. The tilt
angle is indicated on the
ND in cyan font.
GAIN Sets the radar sensitivity.
10 steps are available. When
set to 12 o’clock position,
the gain is calibrated for
standard reflectivity levels,
and the gain value on
the ND (cyan) is blank.
Otherwise: gain values are
displayed in the format
MIN, -G6, ... +G4, MAX,
when in manual mode;
VAR (variable) is shown
when in automatic mode.
Captain’s operation mode switches
Only one of the TFR, WX, WX+T, and MAP
switches can be pushed at a time. The GC switch is
independent of this.
TFR Transfers the first officer’s mode, gain, and
tilt settings to the captain’s radar (vice versa
when the first officer’s TFR switch is pushed
instead). When both TFR switches are
pushed, the test mode activates.
WX Activates the weather mode without
turbulence indication. The ND shows radar
return intensities in green, amber and red.
WX+T Same as WX, and the ND also indicates
turbulence (in magenta) when the ND range
is set below 80 nm.
MAP Effective in automatic mode only. Inhibits
the ground clutter suppression and decreases
the gain sensitivity to optimize the display to
show coastlines and mountains rather than
weather returns.
GC (momentary action) Effective in automatic
mode only. Inhibits the ground clutter
suppression as long as the GC switch is held.
Automatic mode switch
Push Activates the
automatic mode.
For details, refer to
the next page.
Transceiver switch
Push Activates the
right transceiver,
else the
left one.
— Page 487 —
First officer’s controls
Identical to captain’s
controls, but with
reference to the first
officer’s ND.
Test switch
Push Tests the system. Both NDs
will show a test raster, and
predictive windshear alerts
will sound.
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