(b)
 Mach number (Ref. Fig. 004) The Mach number is always computed. When the Mach number is above .5 (increasing sense) it is displayed in green in the left bottom part of the display area, just below the speed scale in green color. The display range is .50 to .99 (increasing sense) and .99 to .45 (decreasing sense). In case of failure, a red M flag is displayed in place of the Mach number.

 (3)
 Standby altimeter function (Ref. Fig. 005)

 (a) 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.
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 ISIS Indicator - Excessive motion during the initialization phase.
 Figure 003

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 ISIS Indicator - Airspeed Display
 Figure 004

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 ISIS Indicator - Altitude Display
 Figure 005

R 1EFF : 106-149, 213-213, 221-299, 301-399, 1 34-22-00Page 7 1401-499, 1Config-2 Aug 01/05 1 1 1CES 1 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.

 (b)
 Negative altitude (Ref. Fig. 006) 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.

 (c)
 Optional metric altimeter function (Ref. Fig. 007, 008) The metric altitude can be displayed in the right top part of the display in addition to the altitude in feet. The metric altitude indication is displayed in green by means of a digital read-out surrounded in yellow. The cyan letter M is written just after the altitude value. The altitude in meters is rounded to the closest 10th of meters. In case of negative altitude, the NEG indication is displayed in white just before the metric altitude value.

 (4) Reference barometric pressure indication (Ref. Fig. 009)
 (a) 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 whose value (without units) can be adjusted by turning the knob (first press: STD, second press: baro correction). The barometric correction is displayed in cyan, in the center bottom part of the display, in the range from 745 to 1100 hPa, 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.
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 ISIS Indicator - Negative Altitude Display
 Figure 006

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 ISIS Indicator - Metric Altitude Display
 Figure 007

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 ISIS Indicator - Negative Altitude Display (in meters)
 Figure 008

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 ISIS Indicator - Reference Barometric Display
 Figure 009

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 (5) Standby horizon function (Ref. Fig. 010)
 (a)
 Aircraft symbol The fixed symbol is in yellow color, it comprises three parts: two simplified wing/landing gear parts plus a center part. It provides the pilot with a quick glance attitude information, both in pitch and roll with respect to the attitude sphere.

 (b)
 Pitch angle information (Ref. Fig. 010) The A/C present pitch angle is given by the vertical displacements of the pitch attitude scale with respect to the center of the A/C symbol. The scale moves behind the cut-sphere shaped window, limited by the lines of an upper (blue) and a lower (brown) sector. The scale rotates around the center of the A/C symbol in accordance with the A/C present roll angle. The pitch scale comprises white reference lines and associated pitch angle values. The lines are given every 2.5 degrees from -30 to + 30 degrees. Beyond 30 degrees, red large arrow heads (V-shaped) indicate an excessive attitude and the direction to follow in order to reduce it.
　
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