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STANDBY ALTIMETER
The standby altimeter indication is supplied with static pressure by the standby
air data system to indicate the barometric altitude of the aircraft in feet.
The barometric altitude indication is displayed by means of a black tape with
white indications, positioned vertically in the right part of the display area.
The altitude scale is linear from − 2000 to + 50,000 ft with 100 ft graduations,
with digital indications every 500 ft. This tape moves up and down with respect
to a window surrounded in yellow within which the A/C actual altitude value is
displayed in green digits.
The window is surrounded in cyan when an altitude bug is hidden by this
read−out. In this window, the hundreds of feet are written in a large size
whereas the tens and units are displayed by a drum operating as a
conventional mechanical altimeter.
When the altitude data is not valid, a red ALT flag is displayed in place of the
altitude tape, but the selected pressure is always displayed.
Negative Altitude
If the altitude is negative, the NEG indication is displayed in white close to the
digital read−out. The range is − 2000 to 0 ft.
Barometric Correction
By pushing the barometric reference (BARO) selector knob located in the right
bottom corner of the indicator, the pilot can select the standard barometric
pressure 1013.25 hPa (29.9211 in. Hg) or the barometric correction.
This value (without units) can be adjusted by turning the knob:
S First press STD, second press: baro correction.
S Push it again to select the QNH (sea level atmospheric pressure)
barometric reference in hecto pascal (hPa).
The barometric correction is displayed in cyan, in the center bottom part of the
display, in the range from 745 to 1100 hPa (22 to 32.48 in. Hg.), with a variation
of 10 hPa per rotation of the knob.
In case of standard barometric pressure selection, a cyan STD flag is displayed
in place of the barometric correction value.