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.. The navigation mode is selected (HDG or TRK).
When the VD background image is along the FMS flight plan, a vertical cut is made for each leg. The VD image along the FMS flight plan is a concatenation of
all these vertical cuts.
When the VD background image is along the FMS flight plan, a vertical cut is made for each leg. The VD image along the FMS flight plan is a concatenation of all these vertical cuts.
When the aircraft significantly deviates from the FMS flight plan, the VD image returns on aircraft track.
The VD switches between “on track” mode and “on FMS flight plan path” mode with a threshold of 1 RNP approximately. For instance, when RNP is 1 NM, the switch occurs at 1 NM from the FMS flight plan leg. Refer

If the track changes by more than 3° after the TO waypoint, the vertical view after the TO waypoint is shaded in grey. Refer to Figure 7-26.
When the terrain information is not available, the corresponding portion of the vertical view is shaded in magenta.
.  VD Background Image on Manually Selected Azimuth
The VD background image runs along an azimuth selected by a flight crewmember (refer to 7.1.9.3 – SURV Panel). The azimuths selected by the Captain and the First Officer for the VD image are independent. The azimuth range is +/- 60° from the current track with increments of 1°.

7.1.7.1. GENERATION OF VERTICAL TERRAIN VIEW
According to the VD path reference (aircraft track, FMS flight plan, or manual azimuth), the TAWS function makes a vertical cut along the VD path reference in the terrain database.

 

The width of the vertical cut depends on the VD path reference.
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VD image on FMS flight plan path: For the active leg: 2x FMS RNP or 2x FMS EPU, whichever is the greater, For subsequent legs: 2x predicted RNP,

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VD image on aircraft track:  2x TAWS RNP,

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VD image on manually selected azimuth:  2x TAWS RNP.

 

Note: The RNP value is adapted to the flight phase. Therefore, the corridor width is variable along the flight path.
The terrain database is divided into grids sets (refer to 4.1.1.1 – Terrain Database). The vertical cut in the terrain database determines a group of grid set

7.1.7.2. GENERATION OF VERTICAL WEATHER VIEW
The same principle applies for the generation of vertical weather view. The WXR function makes a vertical cut in the 3D buffer along the VD path reference (aircraft track, FMS flight plan or manual azimuth). However, the vertical cut in the weather radar 3D buffer has no width. It is a “laser cut”.
. Image generation in automatic modes

 

Figure 7-33: Generation of vertical
weather view along track weather view along azimuth
. Image generation in manual modes
In tilt and elevation modes, the WXR function makes the laser cut as illustrated in
　
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