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ND in ARC Mode - Typical En Route Flight Plan R Figure 022
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ND in ARC mode - AP/FD in TRACK mode - A/C off the Flight Plan R Figure 023
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ND in ARC Mode - Takeoff Example R Figure 024
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ND in ARC Mode - VOR/FMGC Discrepancy Message R Figure 025
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ND in Plan Mode R Figure 026
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R
R
R
R
(c) Weather radar information (Ref. Fig. 027) Weather radar information is available in any ND Mode except the PLAN Mode. For a given range selected value, the image scale is the same in the ROSE and ARC modes, since the ROSE diameter is exactly equal to the arc radius in the ARC mode: the weather radar indications in the ROSE mode are identical to those in the ARC mode, but shifted upwards. The same applies to the map data. (Ref. Fig. 028) Consequently, the radius of the heading dial represents half the selected range marker value in the ROSE mode, and the full value in the ARC mode. When the weather radar operates, information related to its proper operation is displayed in the ND R lower corner, above the possible side 2 nav. station characteristics:
-tilt angle
-calibration mode
-failure messages.
Each pilot can remove the weather radar image from his ND by
setting the associated potentiometer to the minimum.
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
Post SB 34-1189 For A/C 001-049,051-060,101-104,
(4) EGPWS Terrain function The EGPWS (ENHANCED GROUND PROXIMITY WARNING SYSTEM) is built over the GPWS. It includes a world wide terrain data base which allows to display the terrain hazards, in the selected range, on the ND and to generate some warning or caution when the predicted flight path of the A/C becomes unsafe with respect to the terrain. This function called "terrain awareness alerting and display" or "GPWS terrain function" is added to the GPWS functions.
(a) Terrain display on the ND The terrain image is displayed when a EGPWS T/R unit is operating and there is some information to display, and provided that the ND is not in the PLAN mode. The T/R unit is considered as operating when there is information on the bus ARINC 453. The terrain picture may have some elements of various colours: green, yellow, red, magenta, blue(cyan), amber. The EGPWS T/R unit generates 3 colour bits to provide the visual display of the terrain.
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ND - Weather Radar in ARC Mode R Figure 027
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ND - Weather Radar Image in ARC and ROSE Mode R Figure 028
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(b) EGPWS messages on the ND TERR messages The message "TERR" or "TERR AHEAD" is displayed on the ND in lieue of the "TILT" message related to the weather radar (right lower corner) as soon as a terrain frame is detected as valid by the DMC in the ROSE-NAV mode, ROSE-VOR, ROSE-ILS, or ARC mode. The TERR message does not overlay the TILT message because the terrain frames and the WXR frames are never received at the same time by the DMC. The message "TERR AHEAD" is displayed in red colour when a warning criterion is met. It is flashing for 9 seconds, then remains steady and red until the the warning condition disappears. The message "TERR AHEAD" is displayed in amber colour when a caution criterion is met. It is flashing for 9 seconds, then remains steady and amber until the the caution condition disappears. The message "TERR" is displayed in cyan colour otherwise. A priority rule is established to display these messages since they are located at the same place on the ND screen, as follows: TERR AHEAD in red (most priority) TERR AHEAD in amber TERR in cyan (less priority) The message TERR RNG is displayed in red when there is an error in the range or when an FCU fault is detected by the EGPWS. When the EGPWS is in test mode, a special pattern is displayed and if there is no failure, the amber message TERR TST is displayed.
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