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the IRS can be aligned with the departure
airport as the original destination.
The IRS can detect if the departure airport
position is significantly different from the
actual aircraft location. This can happen if the
crew makes an error when entering the
FROM/TO airport information. In this case, an
error message is displayed on the MCDU.
The crew should remember that the IRS
alignment position taken into account when
aligning the IRS is the departure airport
reference location stored in the database. This
is different from the actual aircraft position. In
practice, you don't need to adjust the IRS
position before aligning. This is because this
aircraft is equipped with a GPS system that
will do this automatically when the takeoff
thrust is applied. It means the crew should not
use the navigation display when taxiing
because the IRS may not be perfectly aligned
at this time.
IRS Unit
This device is located on the upper part of the
overhead panel.
1. Display selector : This switch lets the pilot select
the information displayed on the LCD screen.
The modes will be described later in this section.
2. IRS selector : As this aircraft is equipped
with 3 Inertial Reference Systems, this
switch selects the one that is used to
display information on the LCD screen.
3. Mode selector : For each IRS, a switch lets
the crew select the mode used for each IRS :
• OFF : the IRS is turned off and requires a
new alignment before being used again.
• NAV : all the IRS and air data information
are used for navigation.
• ATT : only the air data information is used
for navigation.
Display modes
TEST : This mode is dedicated to the test of the
LCD screen. It shows characters that indicate
the digital display is working correctly.
TK/GS : This mode displays the current track
and ground speed computed by the IRS.
PPOS : The current plane position is displayed
on the LCD screen.
WIND : The wind direction and velocity
computed by the IRS are shown.
HDG : The current true heading is displayed.
STS : This mode displays a status message of
the MCD screen. It can be one on the following
:
• STS-ENTER PPOS : the IRS is not
aligned, so the aircraft’s position is not
known and should be entered.
• STS-EXCESS MOTION : The aircraft should
not move during the IRS alignment process.
This message is displayed if the aircraft is
currently moving during the alignment
process.
SYSTEMS
Airbus Series Vol.1
(c) 2007 Wilco Publishing www.wilcopub.com - www.FeelThere.com 59
• STS-ALIGN xxx : This message indicates
the remaining time for IRS alignment.
IRS usage with Flight Simulator :
1. The IRS position entry through the IRS keyboard
is not implemented. It can be done only through
the MCDU.
2. The IRS alignment time is configurable through
the aircraft configuration window (refer to the
setup section for more information). In the real
aircraft, a full IRS alignment takes 10 minutes.
3. The STS-ALIGN status message displays the
remaining alignment time in real seconds,
regardless of the time configured by the user in
the configuration window.
Alerts & Warning
While the IRS are aligning, a green information
message ‘IRS IN ALIGN’ appears on the E/WD,
indicating the remaining time for alignment.
This message turns amber if the engines are
started to indicate that the aircraft should not
move during the IRS alignment phase.
RADIO
Standard operation of the radio equipment
involves use of the MCDU for radio navigation
(in fact, the crew rarely interact with the radio
navigation settings because the FMGC is in
charge of auto-tuning the VOR and ILS). The
radio management panels are used for voice
radio. Nevertheless, the Radio Management
Panels can be used for radio-navigation
settings in case of an FMGC failure.
Radio Management Panels (RMP)
Two Radio Management Panels are located on
the pedestal. One is available for the captain and
one for the first officer. The Captain's RMP can be
used to set VOR1 and the FO's RMP for the VOR2.
1. Active frequency window shows the current
frequency used for the selected radio.
2. Standby/Course window shows the standby
frequency for the selected radio. In case of
a VOR/ILS setting, this window is also used
to set the VOR/ILS course.
3. Swap button is used to swap active and
standby frequencies.
4.5.Selection pushbuttons for the VHF radio
channels.
　
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