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Figure 4-54 Boeing TEST Display
N NOTE
Position of the tilt code will vary for different EFIS displays.
1st Edition, 1st Revision
18 Sep 03 4-55
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
The table below shows the tilt codes that show on the display to indicate
which system component requires maintenance.
Flashing Tilt Codes
Fault Tilt Code
Attitude-Left -1
Attitude-Right +1
Radio Altimeter-Left -2
Radio Altimeter-Right +2
DADC-Left -3
DADC-Right +3
EFIS-Left -4
EFIS-Right +4
WS Qualifiers -5
Pitch/Roll -5
Air/Ground -7
WS Inhibit Input -8
1st Edition, 1st Revision
4-56 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Manual Operation
MULTISCAN MANUAL OPERATION
When MultiScan is operated in manual mode, the radar will function
as a conventional weather radar. Tilt and gain settings, thus, become
extremely important for proper weather detection and interpretation.
MANUAL OPERATION: CONTROL PANEL INPUTS AND
OPERATING PROCEDURES
The following control inputs have the same function during both
automatic and manual operation and are explained in the automatic
operation section:
• Dual System Selection (♦page 4-18)
• PWS (Predictive Windshear) (♦page 4-52)
• TFR (Transfer) (♦page 4-20)
• WX (Weather Mode) (♦page 4-27)
• WX+T (Weather Plus Turbulence Mode) (♦page 4-28)
• TURB (Turbulence Mode) (♦page 4-31)
• MAP(♦page 4-33)
• TEST(♦page 4-52)
1st Edition, 1st Revision
18 Sep 03 4-57
MULTISCAN OPERATION COLLINS
MultiScan Manual Operation MultiScan™ Radar
MANUAL OPERATION (MAN/AUTO)
Airbus: Manual operation is activated for both the captain and first
officer by moving the MULTISCAN MAN/AUTO switch to the MAN
position (figure 4-55).
Figure 4-55 Airbus MULTISCAN MAN/AUTO Control
Boeing: The MultiScan AUTO button (figure 4-56) 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 AUTO button is in the out position, both pilots are in manual.
1st Edition, 1st Revision
4-58 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Manual Operation
Figure 4-56 Boeing AUTO Control
N NOTE
For display annunciations during manual use of the radar, refer to
the Display Annunciation section on ♦page 4-4.
1st Edition, 1st Revision
18 Sep 03 4-59
MULTISCAN OPERATION COLLINS
MultiScan Manual Operation MultiScan™ Radar
GROUND CLUTTER (INACTIVE FOR MANUAL OPERATION)
Airbus: The GCS switch (figure 4-57) is inactive during manual
operation.
Figure 4-57 Airbus GCS Control
Boeing: The GC button (figure 4-58) is inactive during manual
operation.
Figure 4-58 Boeing GC Control
1st Edition, 1st Revision
4-60 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Manual Operation
TILT CONTROL
The TILT control is active only during MANUAL operation and allows
the flight crew to adjust the antenna tilt for the best display. During
MultiScan AUTOMATIC operation, the TILT control is not active since
the antenna tilt settings are managed automatically by the MultiScan
function.
Tilt control is the most important factor for proper manual operation of
the radar. In most instances, the flight crew is looking for a compromise
tilt angle between too much ground return and too little weather return
(figure 4-61 and ♦page 5-6). The best tilt setting will vary depending
on the aircraft phase of flight (i.e., low altitude, mid altitude and high
altitude). Recommended tilt settings for the various phases of flight are
discussed in the scenarios that follow.
Figure 4-59 Airbus TILT Control
1st Edition, 1st Revision
18 Sep 03 4-61
MULTISCAN OPERATION COLLINS
MultiScan Manual Operation MultiScan™ Radar
Figure 4-60 Boeing TILT Control
Figure 4-61 illustrates that during manual operation, the best tilt angle
is most often a compromise between a tilt angle that causes too much
ground clutter and a tilt angle that detects too little weather.
Figure 4-61 Tilt Setting Compromise
1st Edition, 1st Revision
4-62 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Manual Operation
LOW ALTITUDE TILT SETTINGS (10,000 FT AND BELOW)
Below 10,000 feet, a tilt setting of between +2° and +7° is recommended
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Collins Weather Radar operator’s guide(21)
