1 The thickness of the laser cut is nil. Refer to 7.1.7.2 – Generation of Vertical Weather View.
Step 4: For each vertical laser cut, AESS projects the On-Path weather of the highest reflectivity on the horizontal plane. If there is no On-Path weather, AESS projects the Off-Path weather of the highest reflectivity on that horizontal plane.
Step 5: Finally, the projections of vertical laser cuts on the horizontal plane
form the horizontal weather view.
7.1.4.1.3. Manual Modes
The 3D buffer eases the manual weather analysis with an enhanced tilt mode, a new elevation mode, and a new azimuth mode.
. Tilt Mode
The enhancement of the tilt mode is triple:
- AESS applies a correction of the Earth curvature on the tilt angle.
- In tilt mode, AESS makes a 360° laser cut around the aircraft along the tilt angle across the 3D buffer. In ND ROSE mode, the AESS displays the weather behind the aircraft.
- The ground de-cluttering is automatic. Thanks to the terrain
database, AESS removes terrain
returns from the weather image (refer to 7.1.4.4 – Ground Mapping). In
addition, beyond the intersection of the laser cut and the ground, the weather
is not displayed. Refer to Figure 7-22.
. Elevation Mode
In elevation mode, AESS:
- Makes a 360° horizontal laser cut at the selected altitude across the 3D buffer
- Displays the weather behind the aircraft in ND ROSE mode.
The selectable altitude range goes from the ground level to 60 000 ft or FL600.
. Azimuth Mode
In azimuth mode, AESS:
-Makes a vertical laser cut at the selected azimuth across the 3D buffer
-Displays the weather contained in the vertical laser cut on VD.
Refer to 7.1.7.2 – Generation of Vertical Weather View and Figure 7-33.
7.1.4.2. ENHANCED TURBULENCE DETECTION
The turbulence detection has been improved thanks to new pulse waveforms and digital signal processing. The detection range is 40 NM from the aircraft and 20 NM laterally on either side from the aircraft centerline.
When the AESS detects turbulence2, the AESS displays turbulence on ND in all weather radar operating modes including ground mapping.
The AESS does not display turbulence on the Vertical Display.
7.1.4.3. PREDICTIVE WIND SHEAR (PWS) DETECTION
The AESS automatically activates the PWS detection below 1 500 ft AGL. The detection range goes from 0.5 to 5 NM. When the AESS detects wind shears, the AESS displays wind shears on ND in all weather radar operating modes including ground mapping. Wind shears are not shown on Vertical Display.
Refer to Figure 6-18 for the envelopes of wind shear alerts (Honeywell pattern).
2 As a reminder, the weather radar does not detect Clear Air Turbulences (CAT).
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