getting to grips with surveillance(115)

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7.1.4.1.3 – Manual Modes.
7.1.7.3. INTERPRETATION OF WEATHER AND TERRAIN ELEVATION ON VD
The aircraft altitude on VD is the barometric altitude. Atmospheric conditions (temperature and pressure) influence the barometric altitude. As a consequence:
- At the current aircraft position (i.e. where atmospheric conditions are known), terrain and weather elevation are reliable on VD.
- Ahead of the current aircraft position (i.e. where atmospheric conditions are unknown), terrain and weather elevations are not reliable on VD.
Figure 7-34 illustrates the case where the air ahead of the aircraft is getting colder. The aircraft is at 5 000 ft. The 5 000 ft isobar gets lower as the air temperature decreases. The terrain elevation below the aircraft is 2 000 ft (mark 1 in Figure 7-34) as atmospheric conditions are known. However, the highest terrain elevation ahead of the aircraft is not 3 000 ft as AESS does not know the atmospheric conditions at that location (mark 2 in Figure 7-34).
The same interpretation can be made for weather information.

 

7.1.8. AESS INDICATIONS
7.1.8.1. NAVIGATION DISPLAY (ND)
Captain and First Officer ND displays are independent. Each flight crewmember can display the desired information (terrain or weather) in the desired mode (tilt, elevation, azimuth, or automatic).

AESS displays turbulence indications on ND within:
-
40 NM ahead of the aircraft

-20 NM on either side of the aircraft centerline
-4 000 ft above or below the aircraft altitude. Refer to Figure 7-24 for AESS radar coverage.

To enhance awareness of wind shears, the WXR function highlights sectors where wind shears occur in yellow for ND range greater than 10 NM.
7.1.8.2. VERTICAL DISPLAY (VD)
.  VD image on aircraft track
When the VD image is on aircraft track and the aircraft is under specific conditions4, the white indication VIEW ALONG ACFT TRK is displayed at the bottom of VD.
.  
VD image on FMS flight plan
path

.  
VD image on manually selected azimuth

 

When the VD image is on manually selected azimuth, the cyan indication VIEW ALONG AZIM NNN° (NNN is the manually selected azimuth) is displayed at the bottom of VD. The eye icon highlights the manual setting.

4 For instance, in managed mode, when the aircraft deviates from the flight plan or the XLS approach course. Refer to your FCOM for details.

The AESS also displays a white reference line on ND to illustrate the manually selected azimuth (refer to Figure 7-36).
When the flight crew does not select any new azimuth value during 30 seconds, the VD image automatically returns to a default VD path reference (i.e. along aircraft track or FMS flight plan path). Five seconds before the 30-second timer expires, the white reference line on ND flashes.
The selected azimuth for either terrain or weather analysis is not a fixed bearing. When the aircraft turns, the white reference line sticks to a heading. Practically, the white reference line moves with the compass rose on ND. When the white reference line reaches the +/- 60° limits, the white reference line sticks to the limit until the aircraft turns in the opposite direction.
　
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