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return to the default GCS mode when it is released.
1st Edition, 1st Revision
4-16 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Automatic Operation
Figure 4-15 Boeing GC Control
TILT CONTROL (INOPERATIVE DURING AUTOMATIC
OPERATION)
During MultiScan automatic operation, the TILT controls are not active.
The TILT setting displayed on the EFIS represents the average between
the upper and lower beams (♦page 3-6).
Figure 4-16 Airbus TILT Control
1st Edition, 1st Revision
18 Sep 03 4-17
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
Figure 4-17 Boeing TILT Control
DUAL SYSTEM SELECTION (FOR AIRCRAFT EQUIPPED
WITH TWO R/TS)
Dual system selection allows the flight crew to switch between R/Ts in
an aircraft with a dual R/T configuration.
Airbus: The SYS switch allows the flight crew to select either the
number 1 system (left R/T) or the number 2 system (right R/T). The
OFF position removes power from the radar system.
1st Edition, 1st Revision
4-18 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Automatic Operation
Figure 4-18 Airbus (Single & Dual R/T Configurations)
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 2 switch position is inactive.
1st Edition, 1st Revision
18 Sep 03 4-19
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
Boeing: The L/R button selects either the left or right R/T. The button
is an alternate action latching design. When the button is depressed,
the right system is selected. When the button is out, the left system is
selected. The silk-screen label on the L/R button provides a visual
indication as to which R/T is selected. For single R/T systems, there is
no L/R select button.
Figure 4-19 Boeing (Dual R/T Configuration Only)
N NOTE
For Boeing aircraft, power to the radar is applied to the system
through the WXR button on the EFIS control panel.
TFR (TRANSFER) – BOEING ONLY
Boeing: The TFR button allows the Captain or First Officer to select all
of the control settings from the opposite side except range. Therefore, if
the First Officer presses the TFR button, the First Officer’s radar control
settings and display will be slaved to the Captain’s settings. Conversely,
if the Captain presses the TFR button, all control settings and display
will be slaved to the First Officer’s side. This function works for both
AUTO and Manual modes of operation. During Manual operation, the
TFR includes slaving of the TILT value selected on the opposite side.
1st Edition, 1st Revision
4-20 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Automatic Operation
Figure 4-20 Boeing Transfer Control
WARNING
Do not operate the Weather Radar system with both the left TFR
push button and right TFR push button selected at the same
time. The MODE, GAIN, and TILT of the system can no longer
be determined by viewing the control panel. In most system
configurations, the Weather Radar will default to the test mode until
one of the TFR buttons is deselected.
N NOTE
If both pilots select TFR, the radar will not be able to determine
which settings to use (the Captain’s or First Officer’s) to supply
information to the EFIS. If this occurs, the radar will display a radar
test pattern on the EFIS (♦page 4-55).
1st Edition, 1st Revision
18 Sep 03 4-21
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
WEATHER DETECTION
WEATHER DETECTION CHARACTERISTICS DURING
AUTOMATIC OPERATION
OPTIMIZED WEATHER PRESENTATION AT ALL RANGES
Because MultiScan emulates an ideal radar beam (♦page 3-5),
the entire weather picture from 0-320 NM is stored in computer
memory. Furthermore, since ground clutter is eliminated with computer
algorithms there is no need to compromise between a tilt angle that
eliminates ground clutter and a tilt angle that gives the best weather
picture (♦page 5-6). The pilot simply selects the desired range scale
and that portion of the optimum weather presentation is displayed on
the weather radar display.
1st Edition, 1st Revision
4-22 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Automatic Operation
Figure 4-21 Optimized Weather at Various Ranges
EXTENDED RANGE LOW ALTITUDE WEATHER &
PROTECTION FROM VAULTING
During low altitude operation MultiScan uses multiple beams at different
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Collins Weather Radar operator’s guide(14)
