(c)
Roll angle information A yellow triangle which remains on the line going through the center of the A/C symbol and which is perpendicular to the horizon line, moves against the fixed roll scale on the upper contour of the attitude sphere. This fixed roll scale comprises white marks for the 10 degrees, 20 degrees, 30 degrees, 45 degrees and 60 degrees significant values, on either side of the zero position (horizontal wings) which is indicated by a small fixed black triangle surrounded in white.
(d)
Attitude failure presentation (Ref. Fig. 011) In case of detected failure of the pitch and/or roll angle information, the whole attitude and guidance display is replaced by the ATT red flag.
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ISIS Indicator - Pitch Scale Display
Figure 010
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ISIS Indicator - Attitude Failure Display
Figure 011
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(e) Lateral acceleration A black surrounded white trapezoidal index below the roll reference triangle represents the A/C lateral acceleration. Lateral acceleration is displayed in the range from -0,2 to +0,2g. If the lateral acceleration exceeds this range, it is not displayed any more. When the lateral acceleration is null, the centre of the symbol is in a neutral zone, the width of which corresponds to the middle of the base of the reference triangle. This can result on ISIS in a shifting up to one millimeter between this triangle and the symbol of lateral acceleration. This behaviour comes from a compromise between the resolution of the sensors, the precision of the display and the mounting of the equipment on the instrument panel.
(6) LS function (Ref. Fig. 012, 013) When the LS pushbutton switch located on the right top part of the indicator is pushed, the Glide Slope (G/S) and Localizer (LOC) scales come into view. If the LOC and/or G/S signals are in Failure Warning condition or No Refresh, the relative scale disappears and the relative red flag LOC and/or G/S appears respectively in the left bottom corner and/or in the right top corner of the display area. If the LOC and/or G/S signals are in NCD condition, only the scales without diamond are displayed. (Ref. Fig. 014)
B. Standby Compass The standby compass consists of a magnetic element rotating inside a compass bowl, immersed in a damping liquid. The magnetic element (1) is linked to a graduated compass card which moves against a lubber line (2) and gives the magnetic heading. Above the viewing window are two apertures (4) marked B (E.W) and C (N.S), allowing to achieve compensation by positioning the two small magnetized bars (compensator). Below the viewing window is a non-magnetic lamp (3) assembly which provides illumination of the compass card.
4. Power Supply____________ (Ref. Fig. 015)
A. ISIS Indicator The ISIS indicator is supplied with 28VDC from the essential busbar 401PP. In case of loss of this busbar, the supply of the ISIS indicator is automatically switched over to the battery busbar 703PP by means of the relay 7XB. Consumption of the indicator is 20 W maximum in steady state.
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ISIS Indicator - LS Display
Figure 012
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ISIS Indicator - LS Failure Display
Figure 013
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Standby Compass - Data Indicating
Figure 014
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ISIS Indicator - Power Supply
Figure 015
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Transparency time for the ISIS indicator is not less than 50 ms
(memorizing of current configuration on power supply transients comprised
between 50 and 200 ms).
The display is lost during power supply cut off comprised between 50 and
200 ms.
The system is supplied through these circuit breakers:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU STBY/INST 5FN F12 105VU NAV/STBY/INST/BAT 23FN J01
B. Standby Compass The standby compass is supplied with 28VDC from the sheddable essential bus 801PP.
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