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NOTE: The ADIRU data sent to the ECAM System Display
(E/SD) are Static Air Temperature (SAT) and Total
Air Temperature (TAT).
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ADIRS SWITCHING
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ADIRS SWITCHING
SWITCHING EXAMPLE
Here is an example of ADIRS switching in order to see
the effects on the schematic.
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ADIRS SWITCHING EXAMPLE
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34 - NAVIGATION
34-10-00 ADIRUS INTERCONNECTION
CONTENTS:
ADR to IR
ADR to ADR
ADR Switching
IR Switching
Switching Control
Self Examination
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ADIRUS INTERCONNECTION
ADR TO IR
The ADR transmits information used to compute IR data.
The ADR output buses are connected to the IR inputs
respectively called internal (INT) A and B.
Basically, each IR receives 3 ADR outputs, but uses
its own ADR output for IR data computation.
ADR TO ADR
Each ADR receives air data computed by the two other
ADRs to crosscheck its own data.
The 4 parameters checked are:
- static pressure,
- total pressure,
- Angle Of Attack (AOA),
- Total Air Temperature (TAT).
ADR SWITCHING
When the Captain or First Officer ADR fails, the AIR
DATA switch allows the crew to perform a manual
switching to ADR3 to recover air data display.
Note: The basic purpose of the AIR DATA/ATT HDG
switching is to recover data display.
IR SWITCHING
When the Captain or First Officer IR fails, the
attitude heading switch allows the crew to perform a
manual switching to IR3 to recover inertial data
display.
When a manual switching is performed, the ADR
associated to the failed IR is automatically switched
to IR3 to maintain a computation/display homogeneity.
If the associated ADR is not available, IR3 will work
with ADR3.
SWITCHING CONTROL
Two discretes, AUTO and MANUAL, permit each IR to
select a valid input.
AUTO is always grounded for IR1 and IR2.
The state of IR3 AUTO or MANUAL discrete depends on
the selector position.
As soon as an ADR fails, before manual switching, the
air data display is lost but the associated IR
automatically switches to ADR3 to ensure computation
continuity as the internal bus is invalid.
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ADIRUS INTERCONNECTION
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SELF EXAMINATION
What must be done in case of ADR1 failure?
A - Set AIR DATA switch to CAPT3 position.
B - Set ATT HDG switch to CAPT3 position.
C - Leave AIR DATA and ATT HDG switches on
NORM position.
What must be done in case of IR3 failure?
A - Set AIR DATA switch to F/O3 position.
B - Set ATT HDG switch to F/O3 position.
C - Leave ATT HDG switch in NORM position.
When AUTO discrete is grounded, where does the IR
receive air data from?
A - Input bus A.
B - Input bus B.
C - Internal bus, then from bus A, then from
bus B depending on bus validity.
TMUADIE01 LEVEL 3
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