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Display Annunciations MultiScan™ Radar
DISPLAY ANNUNCIATIONS
AIRBUS DISPLAY ANNUNCIATIONS
Automatic operation is considered to be the standard mode of operation
on Airbus aircraft. Therefore, there is no EFIS indication when the
automatic MultiScan function is selected. During manual operation,
MAN appears on the EFIS display by the tilt code.
The top picture in figure 4-5 shows that AUTO is selected because the
-1.5° tilt code has no indication in front of it. MAN GAIN is displayed
because the gain is in some position other than CAL (calibrated). The
bottom picture in figure 4-5 shows that Manual is selected because
MAN shows in front of the +2.0° tilt code. CAL (calibrated) gain is
selected since the MAN GAIN indication is not present. N NOTE
When the radar fails in the AUTO mode, the tilt field will indicate
either an A-15, A-15.5, or A-16 value with an associated display fail
message (i.e., WXR SYS or AUTOTILT FAIL). Switch the radar to
the MAN mode and operate per standard procedures.
1st Edition, 1st Revision
4-4 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar Display Annunciations
Figure 4-5 Airbus Automatic and Manual Operation Annunciations
1st Edition, 1st Revision
18 Sep 03 4-5
MULTISCAN OPERATION COLLINS
Display Annunciations MultiScan™ Radar
Should the automatic function fail, weather will not show and NO
AUTOTILT will be displayed (figure 4-6) until the automatic function is
deselected by the flight crew (♦page 4-13).
Figure 4-6 Airbus Automatic Function Fail Annunciation
1st Edition, 1st Revision
4-6 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar Display Annunciations
BOEING DISPLAY ANNUNCIATIONS
On Boeing aircraft, an A will show on the EFIS by the tilt code during
automatic operation (see the top picture in figure 4-8). An M will show
during manual operation (see the bottom picture in figure 4-8).
The top picture in figure 4-7 shows that radar mode WX+T (weather
plus turbulence) is selected, +5° of tilt is displayed and the radar is in
the A(automatic) mode. VAR indicates gain is either above or below
the CAL (calibrated) gain position. The bottom picture in figure 4-7
shows that radar mode WX+T is selected, +2° of tilt is selected and the
radar is in the M (manual) mode. The absence of any gain annunciation
indicates that CAL gain is selected.
N NOTE
On Boeing aircraft, messages other than VAR may be displayed,
depending on the selected customer options.
1st Edition, 1st Revision
18 Sep 03 4-7
MULTISCAN OPERATION COLLINS
Display Annunciations MultiScan™ Radar
Figure 4-7 Boeing Automatic and Manual Operation Annunciations
1st Edition, 1st Revision
4-8 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar Display Annunciations
RETROFIT AIRCRAFT DISPLAY ANNUNCIATIONS
If the EFIS of a retrofit aircraft has not been updated so that it is able to
display automatic and manual annunciations (♦page 4-4, ♦page 4-7),
the following annunciations will be provided by the radar:
For retrofit installations, automatic MultiScan operation is considered
to be the standard mode of operation. Therefore, there is no EFIS
indication when the automatic MultiScan function is selected. During
manual operation M is displayed in the bottom right hand corner of
the display (see figure 4-8).
Figure 4-8 Retrofit Manual Operation
Should the automatic function fail, weather will not be displayed and NO
AUTOTILT will be displayed (see figure 4-9) until the automatic function
is deselected by the flight crew.
1st Edition, 1st Revision
18 Sep 03 4-9
MULTISCAN OPERATION COLLINS
Display Annunciations MultiScan™ Radar
Figure 4-9 Retrofit Automatic Function Fail Annunciation
N NOTE
A windshear annunciation preempts the M (manual) and NO
AUTOTILT annunciations.
1st Edition, 1st Revision
4-10 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar Display Annunciations
TILT ANNUNCIATION (WHAT DOES IT MEAN DURING
AUTOMATIC OPERATION?)
During automatic operation on both Airbus and Boeing aircraft, the tilt
displayed on the EFIS represents an average of the lower and upper
beam tilts. For instance, during take off the lower and upper beams are
4° apart. The lower beam is set to 3°, the upper beam is set to 7° and
the displayed tilt is 5°. As the aircraft climbs the difference between
the beams decreases. At 10,000 feet AGL and higher, the difference
between the upper and lower beams is approximately 2°. N NOTE
On EFIS display systems that indicate TILT as a whole number,
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Collins Weather Radar operator’s guide(12)
