2
_
 3
_
 4
_
 c_ In PLAN mode, a navigation image is presented, but oriented
 to the geographic North.
 The flight plan is inscribed in it, and any waypoint of the
 flight plan can be positioned at the center of the heading
 dial, through the MCDU controls. The present position of
 the A/C in the flight plan is given (by means of a true
 track orientated A/C symbol).

 NOTE : The WXR picture is available in the ARC, ROSE-NAV,
____ ROSE-ILS and ROSE-VOR modes. Activation of the WXR is made through the WXR control unit.
Scale selector switch
 This selector switch enables each pilot to select the desired
 scale factor for the presentation of navigation, TCAS and
 weather radar information on his ND, among those values: 10,
 20, 40, 80, 160, 320 nautical miles.

ADF-VOR selector switches
 These 3-position selector switches enable each pilot to have
 ADF or VOR bearing pointers displayed on his ND, as well as
 the corresponding NAV station characteristics, in any mode
 except the PLAN mode.

Selection of data stored in the FMGC data base
 In addition to the data which are permanently displayed in
 PLAN, ARC or ROSE-NAV mode, further optional data can also be
 displayed through five pushbutton switches marked CSTR, WPT,
 VOR-D, NDB, ARPT respectively.
 Each of these pushbutton switches has an exclusive function,
 which prevents cluttered display of information on the image.
 The option selected is indicated by bars coming on, on the
 corresponding pushbutton switch.

 -ARPT pushbutton switch When pressed, the bars come on green, and all the airports in the zone are presented on the ND.
 -NDB pushbutton switch When pressed, the bars come on green, and all the ADF ground installations are presented on the ND.
 -VOR-D pushbutton switch When pressed, the bars come on green, and all the VOR, DME and VOR/DME ground installations in addition to the tuned Navaids are presented on the ND.
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 -WPT pushbutton switch When pressed, the bars come on green, and all the 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).
 (5)
 FCU AFS control panel

 (a) METRIC ALT pushbutton switch This pushbutton switch, when pressed, enables the pilots to add the actual altitude and the selected altitude in meters on their PFD.

 (6)
 EFIS switching panel Item B (Ref. Fig. 011) These panels are located on either side of the main instrument panel.

 (a) PFD potentiometer The PFD brightness is manually controlled through a single potentiometer which works in conjunction with the automatic brightness control system provided by the light sensors located on the face of each PFD DU. This system provides adjustment of the DU 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 to show to the pilot that the DU is still in operation. The extreme left position of the potentiometer switches off the PFD DU. Automatic and manual reconfiguration are then enabled.
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 (b) ND potentiometer 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 general adjustment of the brightness of the ND. The extreme left position of the inner potentiometer switches off the ND DU.

 As in the case of the PFD, these manual controls work in conjunction with the automatic brightness control system.
 (c) PFD/ND transfer manual control On either pilot EFIS switching panel, pressing the PFD/ND transfer pushbutton switch interchanges the PFD and ND. At each action on this pushbutton switch, there is an inversion between the 2 displays: the PFD is replaced by the ND and vice-versa.
 (7)
 SWITCHING panel Item C (Ref. Fig. 011)

 (a)
 ADIRS source switching If a primary AIR DATA or ATTITUDE/HEADING source (side 1 or side 2) fails, the relevant flags come into view on the associated PFD and ND (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, by setting the SWITCHING/AIR DATA or the SWITCHING/ATT HDG selector switch to CAPT ON 3 for side 1, or to F/O ON 3 for side 2. These selector switches are located on the source SWITCHING panel which is aft of the ECAM control panel, on the center pedestal. In case of complete failure of the ADIRU 1 (or 2), both selector switches (AIR DATA and ATT HDG) must be set to the switched position (CAPT ON 3 (or F/O ON 3).
　
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