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to either the selected barometric pressure, or the standard pressure. The barometric pressure
ranges from 745 to 1 100 hPa.
(3) Barometric selection knob
It enables the selection of a barometric pressure, setting a variation of 10 hPa per rotation of
the knob. The standard barometric pressure can be selected by pressing the barometric knob.
“STD” is then displayed in place of the pressure value.
Pressing the knob again will display the selected barometric pressure.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
ISIS
A318/A319/A320/A321 FLEET DSC-34-25 P 7/12
FCOM 19 AUG 10
(4) Altitude bug
When an altitude bug is entered through the bugs function, the corresponding altitude mark
is indicated by a cyan dash, or a cyan box, when the dash covers the digital indication on the
scale.
ALTITUDE
Applicable to:
,
,
MSN,,,,
(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. It is indicated in both hecto Pascal
(HPA) and inches of mercury (Hg).
(3) Barometric selection knob
It enables the selection of a barometric pressure, setting a variation of 10 hPa per rotation of
the knob. The standard barometric pressure can be selected by pressing the barometric knob.
“STD” is then displayed in place of the pressure value.
Pressing the knob again will display the selected barometric pressure.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
ISIS
A318/A319/A320/A321 FLEET DSC-34-25 P 8/12
FCOM 19 AUG 10
(4) Altitude bug
When an altitude bug is entered through the bugs function, the corresponding altitude mark
is indicated by a cyan dash, or a cyan box, when the dash covers the digital indication on the
scale.
LANDING SYSTEM FUNCTION
Applicable to:
,
,
MSN,,,,
(1) Localizer scale and index
(2) Glideslope scale and index
The deviation scales appear when the LS pushbutton is pressed. The indexes appear when the
Glideslope and Localizer signals are valid and deviation scales are displayed.
(3) LS selection pushbutton
Pressing the LS pushbutton will display the ILS scales. Pressing it again will de-select the ILS
scales.
CAUTION Do not use the ISIS LS for takeoff using the localizer of the opposite runway,
or for a back-course localizer approach. The LOC deviations are given in the
wrong sense.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
ISIS
A318/A319/A320/A321 FLEET DSC-34-25 P 9/12
FCOM 19 AUG 10
BUGS FUNCTION
Applicable to:
,
,
MSN,,,,
(1) BUGS function selection pushbutton
Pressing the BUGS pushbutton will activate the BUGS function and display the bug values to
be selected.
(2) SPD BUG and ALT BUG columns
The SPD BUG column gives four speed values (in knots) that can be selected by the crew.
The ALT BUG column gives two altitude values (feet) to be selected by the crew.
(3) BUGS value selection knob
It allows the bug value to be set by rotating the BARO knob. This value cannot be lower than
30 kt for a speed bug, or a negative value for an altitude bug.
Pressing the BARO setting knob, once a bug value box is activated, will deselect the bug value.
The “OFF” label comes on close to the activated box.
The entered values are memorized by the system, when exiting the screen, by pressing the
BUGS pushbutton (1), or after 15 s without any pilot action.
(4) “+”/”-” box activation buttons
Access from one box to another is obtained by pressing the “+” or “-” pushbutton.
When a bug value is entered, access to the next box is obtained by pressing the “-” pushbutton.
The box becomes active and flashes.
The “+” pushbutton can be used to return to a previous box.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
ISIS
A318/A319/A320/A321 FLEET DSC-34-25 P 10/12
FCOM 19 AUG 10
Note: Use of the ISIS bugs function is not recommended because, in the event that both
PFDs are lost in flight, when the ISIS bugs were previously set for takeoff, then for the
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 4(35)
