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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 which 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 to show 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, pressing 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, by setting 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
(a) Primary flight display The PFD image presents the main information necessary for the control of the A/C, arranged in the basic T configuration:
-A/C symbol, pitch and roll indications, plus associated protections provided by the flight controls, flight path angle and drift angle, and guidance symbols (Flight or Flight Path Director) are presented on the center part of the display
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to the left, an airspeed scale provides the pilot with the A/C actual indicated Airspeed, and with all the airspeed limitations
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to the right, an altitude scale and a vertical speed scale provide the pilot with the A/C actual baro altitude and baro/inertial vertical speed, plus the altitude and flight level selections.
-the vertical speed scale also gives the forbidden V/S zones when TCAS resolution advisories exist.
- on the lower part, a heading scale provides the pilot with the A/C actual magnetic heading, actual track, selected heading/track, and ILS course.
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- on the upper part, a full Flight Mode Annunciator provides the pilot with the various armed/active longitudinal and lateral modes, and the AP/FD/A-THR engagement status, plus various messages.
-at last, vertical and lateral deviation scales give A/C GLIDE/SLOPE deviation (or vertical deviation with respect to an FMS computed approach path) and LOCALIZER deviation.
For an improved legibility, the speed, altitude, vertical speed and heading scales are presented on background shading areas in dark grey color.
R (Ref. Fig. 018)
1 Attitude area
_
-A/C attitude: The fixed A/C symbol (at the center of the PFD) and the fixed roll reference (at the top of the sphere) give the A/C actual pitch and roll indications on the sky/ground attitude sphere. Small green marks (+30., -15. in pitch and +/-65. in roll) shows the attitude protections granted by the EFCS in the normal law. They are replaced by X (amber) if protections are lost. In case of excessive attitude in pitch and/or roll, the PFD image is simplified for better legibility: the FMA, the guidance symbols, and the lateral and vertical deviation indications are removed.
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