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ADIRS PRINCIPLE - ADM
TMUADI001-P02 LEVEL 1
EFFECTIVITY 34-10-00 Page 5
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
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EFFECTIVITY Page 45
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ADIRS PRINCIPLE
ADR COMPUTATION
The ADR processes sensor and ADM inputs in order to
provide air data to users.
TMUADI001-T03 LEVEL 1
EFFECTIVITY 34-10-00 Page 6
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EFFECTIVITY Page 46
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ADIRS PRINCIPLE - ADR
TMUADI001-P03 LEVEL 1
EFFECTIVITY 34-10-00 Page 7
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EFFECTIVITY Page 47
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ADIRS PRINCIPLE
IR STRAPDOWN
In a strapdown Inertial Reference System the gyros and
the accelerometers are solidly attached to the aircraft
structure.
The strapdown laser gyro provides directly
accelerations and angular speeds.
TMUADI001-T04 LEVEL 1
EFFECTIVITY 34-10-00 Page 8
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EFFECTIVITY Page 48
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ADIRS PRINCIPLE - IR
TMUADI001-P04 LEVEL 1
EFFECTIVITY 34-10-00 Page 9
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ADIRS PRINCIPLE
RING LASER GYRO
The three ring laser gyros, one for each rotation axis,
provide inertial rotation data and are composed of two
opposite laser beams in a ring.
At rest, the two beams arrive at the sensor with the
same frequency.
An aircraft rotation creates a difference of
frequencies between the two beams.
The frequency difference is measured by optical means
providing a digital output which, after computation,
will provide rotation information.
NOTE: Light Amplification Stimulated Emission of
Radiation (LASER)
TMUADI001-T05 LEVEL 1
EFFECTIVITY 34-10-00 Page 10
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EFFECTIVITY Page 50
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ADIRS PRINCIPLE - GYRO
TMUADI001-P05 LEVEL 1
EFFECTIVITY 34-10-00 Page 11
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EFFECTIVITY Page 51
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ADIRS PRINCIPLE
ACCELEROMETER
Three accelerometers, one for each axis, provide linear
accelerations.
The acceleration signal is sent to a processor which
uses this signal to compute the velocity and the
position.
IR COMPUTATION
Each ADIRU computes the laser gyro and the
accelerometer outputs to provide Inertial Reference
data to users.
TMUADI001-T06 LEVEL 1
EFFECTIVITY 34-10-00 Page 12
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ADIRS PRINCIPLE - ACCELEROMETER
TMUADI001-P06 LEVEL 1
EFFECTIVITY 34-10-00 Page 13
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TMUADI001 LEVEL 1
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34 - NAVIGATION
34-10-00 ADIRS PRESENTATION
CONTENTS:
General
MCDU
ADIRS CDU
Probes
FCU
GPS
DMC
DMC/PFD & ND
ADIRS Switching
Users
Self Examination
TMUADIA01 LEVEL 1
EFFECTIVITY 34-10-00 Page 1
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ADIRS PRESENTATION
GENERAL
The Air Data Inertial Reference System (ADIRS) is
composed of three Air Data Inertial Reference Units
(ADIRU), each having their own set of probes and
sensors and a common Control Display Unit (CDU).
MCDU
The Multipurpose Control and Display Units (MCDUs) are
normally used to align the Inertial References, to
initiate the ADIRU tests and to display ADIRU
　
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