(c)
Altitude (ALT) (Ref. Fig. 012) The baro altitude indication is provided by means of a tape which moves up and down behind a window within which the A/C actual altitude is displayed. The tape of the scale is graduated every 100 ft and digital values are displayed every 500 ft in hundreds. The A/C actual altitude is provided by a counter located at the middle of the scale in which the actual value is displayed in green digits. The hundreds of feet are written in a large size whereas the tens and units are displayed by a drum operating as a classical mechanical altimeter. Small white marks are positioned in front of each number on the tape (item A). If the altitude is negative, a NEG white indication is added at the left of the digital value. The digital value is limited to minus 1500 ft (item B). Different displays are presented depending on the baro setting reference (standard or baro corrected), Ref. 31-64-00. In case of baro altitude failure, the scale goes out of view and a red ALT flag flashes for a few seconds in the altitude window, then remains steady (item C). In case of discrepancy between the altitude given by the CAPT air data source and the altitude given by the F/O air data source, a CHECK ALT amber flag is presented on the right side of the altitude scale (item D).
(d)
Vertical Speed (V/S) (Ref. Fig. 013) The baro vertical speed is automatically displayed in the right side of the PFD when the inertial vertical speed is not available (item A). It is a degraded mode. The vertical speed scale consists of:
-a trapezoidal grey background colored surface
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Altitude Indication Display
Figure 012
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Vertical Speed Indication Display
Figure 013
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-
a fixed white scale with 500 ft/mn spaced marks from -2000 ft/mn to +2000 ft/mn
-
a needle giving, in analog form, the actual vertical speed value
-
a number in a moving amber window. This window accompanies the needle (above the needle if V/S > 0, below if V/S < 0). The number gives the V/S value in hundreds of ft/mn. Between -200 ft/mn and +200 ft/mn, both the window and the number disappear.
-above +6000 ft/mn (or below -6000 ft/mn), the needle remains
stopped where it is. When the vertical speed exceeds +6000 ft/mn or -6000 ft/mn, the digital indication and the analog needle change from green to amber. In addition, those indications change to amber in approach, in the following cases:
-
V/S less than -2000 ft/mn below 2500 ft RA
-
V/S less than -1200 ft/mn below 1000 ft RA.
In case of a failure warning, the vertical speed scale is removed
and replaced by a red V/S flag which flashes for a few seconds,
then remains steady (item B).
(2)
ND display (Ref. Fig. 014) The true airspeed (TAS) is displayed on the ND in ROSE, ARC and PLAN mode (item A). The TAS information is displayed by a numerical indication of three digits preceded by TAS indication. This information is displayed in the left upper corner of the ND for speed higher than 100 kts. Below this value TAS indication remains visible but is followed by three dashes (item B).
(3)
Display on the lower ECAM DU (Ref. Fig. 015) The Static Air Temperature (SAT) and the Total Air Temperature (TAT) are permanently displayed on the lower part of the lower ECAM DU by a numerical indication of two digits preceded by the plus or minus sign (item A). These data are delivered by the ADR 2. In case of failure or when NCD information is received from the ADR 2, these data are replaced by crosses (item B).
(4)
Reconfiguration display In case of loss of AIR DATA parameters on CAPT or F/O PFD and ND, the ADR 3 can be used as a back up source by placing the AIR DATA selector switch in CAPT/3 position for EFIS 1 and F/O/3 position for EFIS 2.
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True Airspeed Indication Display
Figure 014
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TAT/SAT Indication Display
Figure 015
1EFF : 051-099, 106-149, 204-299, 301-399, 1 34-13-00Page 63 1401-499, 1Config-3 Aug 01/05 1 1 1CES 1 In case of loss of TAT/SAT parameters on the lower ECAM DU, the ADR 3 can be used as a back up source by placing the AIR DATA selector switch in F/O/3 position. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM NAVIGATION 导航1(146)
