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The brightness of the screen automatically adjusts after power-up tests.
This is because of the photosensitive cell located on the surface of the ISIS system display.
The “+” and “-” pushbuttons then allow this initial brightness to be manually adjusted and
changed.
ATTITUDE
Applicable to:
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
ISIS
A318/A319/A320/A321 FLEET DSC-34-25 P 4/12
FCOM 19 AUG 10
(1) Fixed aircraft symbol
The fixed aircraft symbol is in black, and outlined in yellow.
(2) Roll scale
The roll scale is in white.
The markers are at 0 (small yellow triangle), 10, 20, 30, 45, 60 °C of bank.
(3) Roll index
The roll index indicates the bank angle. It is in black, and outlined in white.
(4) Lateral acceleration index
Lateral acceleration index indicates the aircraft’s lateral acceleration. It is represented by a
trapezoidal index that moves beneath the roll index.
(5) Pitch scale
The pitch scale indicates the aircraft attitude, and it is in white. The scale has markers every
2.5 °, between 30 ° nose up and 30 ° nose down. If the pitch exceeds 30 °, large (V-shaped)
red arrowheads indicate that the attitude is excessive. They also indicate the direction to follow,
to resume normal attitude. The minimum displayed pitch scale is -17.5 ° +15 ° at 0 ° pitch.
(6) ATT RST pushbutton
Attitude indication is reset, by pressing “ATT RST” for at least 2 s. The aircraft must be
level, during this procedure. During the reset time (approx. 10 s), the “ATT 10 s” message is
displayed on the screen. “ATT RST” is also used to realign the system, if excessive aircraft
movement is detected during the alignment phase.
ATTITUDE
Applicable to:
,
,
MSN,,
4538,,
(1) Fixed aircraft symbol
The fixed aircraft symbol is in black, and outlined in yellow.
(2) Roll scale
The roll scale is in white.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
ISIS
A318/A319/A320/A321 FLEET DSC-34-25 P 5/12
FCOM 19 AUG 10
The markers are at 0 (small yellow triangle), 10, 20, 30, 45, 60 °C of bank.
(3) Roll index
The roll index indicates the bank angle. It is in black, and outlined in white.
(4) Lateral acceleration index
Lateral acceleration index indicates the aircraft’s lateral acceleration. It is represented by a
trapezoidal index that moves beneath the roll index.
(5) Pitch scale
The pitch scale indicates the aircraft attitude, and it is in white. The scale has markers every
2.5 °, between 30 ° nose up and 30 ° nose down. If the pitch exceeds 30 °, large (V-shaped)
red arrowheads indicate that the attitude is excessive. They also indicate the direction to follow,
to resume normal attitude. The minimum displayed pitch scale is -17.5 ° +15 ° at 0 ° pitch.
(6) ATT RST pushbutton
Attitude indication is reset, by pressing “ATT RST” for at least 2 s. The aircraft must be
level, during this procedure. During the reset time (approx. 10 s), the “ATT 10 s” message is
displayed on the screen. “ATT RST” is also used to realign the system, if excessive aircraft
movement is detected during the alignment phase, or after 350 h of continuous electrical
supply.
AIRSPEED
Applicable to:
,
,
MSN,,,,
(1) Airspeed scale
A white scale moves in front of a yellow triangle indicating the airspeed. The scale ranges from
5 to 250 kt, with a mark every 5 kt, and from 250 to 520 kt, with a mark every 10 kt.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
ISIS
A318/A319/A320/A321 FLEET DSC-34-25 P 6/12
FCOM 19 AUG 10
(2) Mach Number
The Mach number is displayed in green when greater than 0.5, but disappears only when it
goes lower than 0.45.
(3) Speed bug
When a speed bug is entered via the BUGS function, the corresponding speed mark is
indicated by a cyan dash.
ALTITUDE
Applicable to:
(1) Altitude indication
The altitude indication is given as a white moving scale, and a green digital readout on a grey
background.
The altitude scale ranges from -2 000 to 50 000 ft every 100 ft, with altitude digital indications
every 500 ft. “NEG” appears in white in the negative altitudes window.
If the option is installed, the altitude is also given in meters.
The altitude box changes to cyan, when it also corresponds to a bug value.
(2) Barometric reference
The barometric reference pressure is displayed in cyan, in hectoPascal (hPa). It corresponds
　
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