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there may be a difference in the TILT value between the Captain and
First Officer NAV DISPLAY due to rounding in the display system.
1st Edition, 1st Revision
18 Sep 03 4-11
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
MULTISCAN AUTOMATIC OPERATION
MultiScan is designed for fully automatic operation. For automatic
operation, select the automatic function and the desired range.
Once in automatic mode, the radar adjusts tilt and gain to provide an
optimum weather picture for any range scale or flight condition.
GENERAL CONTROLS
POWER (ON/OFF)
Airbus: Power is applied to the radar when the SYS (system) switch is
selected to 1 or 2. Power is removed from the system when the SYS
switch is in the OFF position.
N NOTE
For Airbus aircraft, a dual system control panel is used for both
single and dual R/T aircraft configurations. In a single R/T
configuration, the SYS switch position 2 is inactive.
Figure 4-10 Airbus Control Panel
1st Edition, 1st Revision
4-12 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Automatic Operation
Boeing: Power is applied to the radar by selecting WXR on the EFIS
control panel.
AUTOMATIC OPERATION (ON/OFF)
Airbus: Automatic operation is activated for both the Captain and First
Officer by moving the MULTISCAN MAN/AUTO switch to the AUTO
position (figure 4-11). When the MULTISCAN MAN/AUTO switch is
selected to MAN, both pilots are in manual and the controls will function
as described in the Manual Operation section (♦page 4-57).
Figure 4-11 Airbus MULTISCAN MAN/AUTO Control
1st Edition, 1st Revision
18 Sep 03 4-13
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
Boeing: The MultiScan AUTO button (figure 4-12) switches between
manual mode and automatic mode. The AUTO button is a latching
alternate action switch. When the AUTO button is pushed in, both
the Captain and the First Officer are in MultiScan automatic mode.
When the button is in the out position, both pilots are in manual and
the controls will function as described in the Manual Operation section
(♦page 4-57).
Figure 4-12 Boeing AUTO Control
N NOTE
When automatic is selected, both the Captain and First Officer will
be in automatic. When manual is selected, both will be in manual.
It is not possible for one pilot to be in automatic and the other one
to be manual.
When automatic is initially selected, the radar will first make a sweep
that looks along the aircraft’s flight path. This ensures that weather
directly in front of the aircraft will be immediately visible to the flight crew.
The second sweep will be at a relatively low tilt angle. Significant ground
clutter may be visible. The ground clutter suppression algorithms
begin to have affect during the second sweep of the antenna and will
be fully initialized by the beginning of the fifth sweep (16 seconds).
When the initialization process is complete, the flight crew will receive
an optimized weather picture with minimal ground clutter for any range
scale selected (♦page 4-22). In addition, OverFlight™ protection (♦page
4-40) will be fully engaged to prevent thunderstorms that are a threat to
the aircraft from falling below the radar beam (figure 4-13).
1st Edition, 1st Revision
4-14 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Automatic Operation
Figure 4-13 MultiScan Initialization Process
N NOTE
MultiScan has a “coast” feature that allows the pilot to momentarily
switch to manual, then back to automatic. If the pilot switches from
auto to manual, then returns to auto within 38 seconds, the radar will
remember the automatic settings and will not need to re-initialize.
1st Edition, 1st Revision
18 Sep 03 4-15
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
GROUND CLUTTER (ON/OFF)
Ground Clutter Suppression (GCS) is enabled during MultiScan
AUTOMATIC operation (♦page 4-12). This is the default position for
both Airbus and Boeing aircraft. On occasion, flight crews may want
to momentarily override the ground clutter suppression feature for
navigation purposes without reverting to manual operation.
Airbus: To observe ground returns, move the GCSswitch from AUTO
to OFF. The switch is spring loaded and will return to the AUTO position
when released.
Figure 4-14 Airbus GCS Control
Boeing: To observe ground returns, press and hold the GC (Ground
Clutter) button. The button is a momentary switch and the radar will
　
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