NOTE : The WXR picture is available in the ARC and ROSE-NAV,
____ ROSE-ILS and ROSE-VOR modes. Activation of the WXR is made through the WXR control unit. When the ND selected mode is the PLAN mode for both NDs, the WXR is automatically disabled.
 2 Scale selector switch
_ This selector switch enables each pilot to select the desired scale factor for the presentation of navigation and weather radar information on his ND, among those values: 10, 20, 40, 80, 160, 320 nautical miles.
 3 ADF-VOR bearing switches
_ These 3 position switches enable each pilot to have ADF and/or VOR bearing pointers displayed on his ND. They also enable display of the corresponding NAV station characteristics, in any mode except the PLAN mode.
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_ In addition to the data which are permanently displayed in PLAN, ARC or ROSE-NAV mode, further optional data can also be displayed. Five pushbutton switches marked CSTR, WPT, VOR-D, NDB, ARPT respectively enable this display. Each of these pushbutton switches has an exclusive function, which prevents cluttered display of information on the image. Bars that come on on the corresponding pushbutton switch indicate the option selected. ARPT pushbutton switch. When pressed, the bars come on green, and all the airports in the zone are presented on the Navigation Display. NDB pushbutton switch. When pressed, the bars come on green, and all the ADF ground installations are presented on the Navigation Display. VOR-D pushbutton switch. When pressed, the bars come on green, and all the VOR, DME and VOR/DME ground installation in addition to the tuned Navaids are presented on the ND. WPT pushbutton switch. When pressed, the bars come on green and all waypoints other than those included in the flight plan are presented on the ND. CSTR pushbutton switch. When pressed, the bars come on green, and the constraints related to the waypoints are presented on the ND (only for the TO and for the next waypoints).
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 (a) Brightness control By either side of the FCU, PFD and ND brightness controls are provided for each pilot (Ref. Fig. 014)
 -PFD The PFD brightness is manually controlled through a single potentiometer. This potentiometer works in conjunction with the automatic brightness control system provided by the light sensors located on the face of each PFD. This system provides adjustment of the DU symbology brightness in order to cope with the changes of the cockpit environmental lighting conditions. If it fails, manual control is retained. When the potentiometer is set at the minimum (but not OFF), the brightness of the display remains at a certain low threshold. This shows to the pilot that the DU is still in operation. The extreme left position of the potentiometer switches off the PFD. If a pilot switches off his PFD, the PFD image is automatically displayed on the adjacent display unit: the ND, instead of the ND image. But in this case, the pilot can recover the ND image by means of the PFD-ND XFR P/B switch.
 -ND The ND brightness is manually controlled through two concentric potentiometers: The outer potentiometer enables a separate adjustment of the brightness of the weather radar image only. The inner potentiometer enables adjustment of the general brightness of the ND symbology. The extreme left position of the inner potentiometer switches off the ND. In this case, the ND image is not displayed on the PFD. As in the case of the PFD, these manual controls work in conjunction with the automatic brightness control system.
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 (b)
 PFD-ND transfer manual control (Ref. Fig. 014) On either main instrument panel, to press the PFD-ND XFR pushbutton switch cross-changes the images between the PFD and ND. At each action on this pushbutton switch, there is an inversion between the 2 images: the one which was displayed on the left DU is displayed on the right DU and vice-versa.

 (c)
 ADIRS source switching (Ref. Fig. 013) If a primary AIR DATA or ATTITUDE/HEADING source (side 1 or side 2) fails, the relevant flags come into view on the associated EFIS DUs (Captain for side 1, First officer for side 2). In this case, the affected pilot can switch over to the ADIRU 3 source to recover the lost flight parameters. To do this, he sets the AIR DATA or the ATT/HDG selector switch to CAPT/3 for side 1, or to F/O/3 for side 2. These selector switches are located on the SWITCHING panel which is aft of the ECAM CP, on the center pedestal. In case of complete failure of the ADIRU 1 (or 2), both selector switches (AIR DATA and ATT HDG) have to be set to the switched position (CAPT/3 or F/O/3).

 (3) Description of the EFIS images
　
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