RNG from the EFIS control section and the copy data received on the symbol generator via the radar data bus.
NOTE : In case of insufficient avionics ventilation, the weather
____ radar image is lost in order to prevent NDs overheat.
(b) Failures which do not affect the radar image The corresponding messages are displayed in amber
-
WR : indicates the loss of the transceiver calibration WEAK
STAB
-
WR : indicates the selection of the radar TEST mode. TEST
- WR : indicates an attitude failure from the ADIRU
ATT
- WR : indicates the loss of the radar antenna stabilization
R 1EFF : ALL 1 34-41-00Page 74 1 1 Config-3 May 01/05 1 1 1CES 1R **ON A/C 303-399, 401-499,
(c) Operational message that does not affect the radar image The following message is displayed in green instead of the TILT value
-PWS SCAN : indicates that the weather radar operates in windshear mode only (weather radar system selector switch set to OFF and windshear mode selector switch set to AUTO on weather radar control unit). On ground the qualifier logic has to be satisfied.
**ON A/C 001-049, 101-105, 151-199,
(5) Windshear data displayed (Ref. table 2 below) (if the predictive windshear function is activated) (Ref. Fig. 014)
(a)
Windshear indications The location of a windshear phenomenon is indicated to the crew by means of an icon superimposed on the radar image. This icon consists of alternating red and black arcs. For 10 NM range selection and above, yellow radial lines appear at the edges and start beyond the windshear event. These lines, superimposed on the radar image, continue to the edge of the display area to provide directional information for the event. The windshear data are always displayed even if the system selector switch on the radar control unit is set to OFF. The windshear switch on the radar control unit has to be set to AUTO.
(b)
Windshear alert
(Ref. Fig. 015, 016)
1 Alert levels
_ There are three alert levels defined in function of event seriousness and distance from the aircraft. The weather radar provides the crew with visual and aural warnings which vary in function of the level detected.
a Windshear warning alert (level 3)
_ This alert corresponds to the most dangerous phenomenons. It is generated for windshear events detected within +/-
0.25 NM from the longitudinal axis of the aircraft and within +/- 25 deg. scan of the aircraft heading.
R 1EFF : 001-049, 101-105, 151-199, 303-399, 1 34-41-00Page 75 1401-499, 1Config-3 Aug 01/05 1 1 1CES 1
Windshear - Data Displayed on the NDs
Figure 014
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 34-41-00Page 76 1201-299, 301-302, 1Config-3 May 01/05 1 1 1CES 1
Windshear - Data Displayed on the NDs
Figure 014A
R 1EFF : 303-399, 401-499, 1 34-41-00Page 77 1 1 Config-3 Aug 01/05 1 1 1CES 1
Windshear - Windshear Alert Ranges and Altitudes
Figure 015
1EFF : ALL 1 34-41-00Page 78 1 1 Config-3 May 01/05R 1 1 1CES 1
Windshear - Windshear Alert Levels and Locations
Figure 016
R 1EFF : 001-049, 101-105, 151-199, 1 34-41-00Page 79 1 1 Config-3 May 01/05 1 1 1CES 1
b
_
c
_
On the ground, the maximum range is 3 NM. In flight, the
maximum range is reduced to 1.5 NM.
During takeoff, level 3 covers ranges from 0 to 1.5 NM,
from 50 to 1200 ft Above Ground Level (AGL). During
landing, this coverage is from 1.5 to 0.5 NM, from 370 to
50 ft.
Range reduction is a linear function of altitude: at 370
ft, range is equal to 1.5 NM and reaches 0.5 NM at 50 ft.
During takeoff, this warning is inhibited from the time the
aircraft attains 100 kts and until it reaches 50 ft AGL.
Level 3 warning is inhibited below 50 ft (in approach
phase) and above 1200 ft.
The windshear warning alert is announced by:
-an aural warning message: GO AROUND WINDSHEAR AHEAD in approach or WINDSHEAR AHEAD, WINDSHEAR AHEAD at takeoff, generated by the radar synthesized voice.
-a visual warning: red W/S AHEAD message on the PFD. Display priority on PFD is given to level 3.
Windshear caution alert (level 2)
This level covers the events detected in a region from 0 to
3 NM, within +/- 25 deg. of the aircraft heading but
outside the windshear warning alert region (level 3).
This caution alert is inhibited:
-
during takeoff, from the time the aircraft attains 100 kts and until it reaches 50 ft AGL,
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