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of the window display.
The PPOS Longitude is entered into the 3 IRs, they
are ready to be aligned.
NOTE: If the actual PPOS is different by more than
1 degree in longitude and latitude from the
previous one it must be keyed and entered twice.
4. The DATA selector is now set to the HDG position.
The TTN (Time To Nav) indication gives the renaming
time in minutes until completion alignment.
The message IRS IN ALIGN appears on the MEMO page
of the ECAM DU.
True Heading (HDG) is displayed at TTN 5.
When the alignment is completed, TTN indication
disappears and all ALIGN lights go off. The 3 IRs
are now aligned.
TMUNA1001-T01 LEVEL 3
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TMUNA1001-P01 LEVEL 3
ADIRS ALIGNMENT THROUGH CDU
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34 - NAVIGATION
34-12-00 ADIRS BACK-UP OPERATION (ATT
MODE)
CONTENTS:
ADIRS Back-Up Operation (ATT Mode)
TMUNA1101 LEVEL 3
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ADIRS BACK-UP OPERATION (ATT MODE)
The ATTITUDE mode (ATT) is a back-up mode providing
only attitude and magnetic heading information, in
case of loss of navigation capability (temporary power
cut-off or BITE failures causing excessive data errors
in NAV mode). We will see here the case of an IR2
fault.
1. The single chime sounds, the MASTER CAUT comes on
and the FAULT light on the ADIRS CDU flashes
indicating an IR2 fault (HDG flag on PFD and ND and
ATT on PFD).
NAV IR2 FAULT message appears followed by:
- ATT HDG SWTG... F/O3, on the ECAM DU telling the
crew to switch to IR3 system.
The IR2 fault is also confirmed by the following
status message on ADIRS CDU when system 2 and STS
are selected:
- STS-SELECT ATT
2. When the ATT position is selected, the respective
IR is in ATTITUDE mode. The FAULT light goes off,
the ALIGN light comes on and then goes off (after
20 s).
ATT MOD on the ADIRS CDU window indicates that you
are in attitude mode (Pitch and Roll data again
displayed on the EFIS).
Note that the ATT mode must be engaged with aircraft
in level flight.
In ATT mode the crew can insert a magnetic heading.
In order to perform the HEADING insertion, the DATA
selector must be set to the HDG position.
3. When the DATA selector is in the HDG and the SYS
selector is in position 2,the magnetic heading can
be keyed and entered into IR2.
When the H key is selected the green ENT and CLR
lights come on. HDG appears in the window display.
The magnetic HDG which is 353.9° is typed on the
keyboard.
NOTE: the magnetic heading is indicated on the
instruments.
4. The ENT key is used to send the magnetic heading
to IR2, when done the ENT and CLR lights go off.
The IR2 is now in ATTITUDE mode and mainly sends
attitude and heading data.
If the IR2 had to be used again, the crew should
take into account the gyro drift and update
frequently the HDG reference.
TMUNA1101-T01 LEVEL 3
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TMUNA1101-P01 LEVEL 3
ADIRS BACK-UP OPERATION (ATT MODE)
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34 - NAVIGATION
34-10-00 ADIRS INDICATIONS ON PFD
CONTENTS:
Attitude
Heading
Airspeed
Vertical Speed
Altitude
Self Examination
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