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wind calculations.
The IR processor calculates these IR data values:
* Pitch
* Roll
* Yaw
* Latitude
* Longitude
* True heading
* Magnetic heading
* Inertial velocity vectors
* Linear accelerations
* Angular rates
* Track angle
* Wind speed and direction
* Inertial altitude
* Vertical speed and acceleration
* Ground speed
* Drift angle
* Flight path angle and acceleration.
The IR data goes out on ARINC 429 data buses.
The IR processor sets the ALIGN discrete during the alignment
mode.
Air Data Reference
Static and pitot air pressure come from the air data modules
(ADMs). Barometric correction comes from the common display
system (CDS).
ADIRS - ADIRU FUNCTIONAL DESCRIPTION
EFFECTIVITY
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The ISDU or the IR data bus supplies bite commands to the ADR
processor. The IR data bus also gives pitch, roll, vertical speed,
and acceleration to the ADR processor. The ADR uses this IR
data to calculate thrust and ground effect compensation values.
The ADR then uses the calculated thrust and ground effect
compensation values as part of its static source error correction
calculation.
Total air temperature (TAT) and angle of attack (AOA) data is
converted from analog data to digital data by the A/D converter
before the data is received by the ADR processor.
The ADR processor calculates these values:
* Altitude
* Baro-corrected altitude
* Altitude rate
* Computed airspeed
* Maximum allowable airspeed
* Mach
* True airspeed
* Static air temperature
* Total air temperature
* Impact pressure
* Static pressure
* Total pressure.
The ADR data goes out on ARINC 429 data buses.
BITE
The IR processor monitors and reports BITE. Detected faults
from the ADR or power supply go to the IR processor for
processing and storage. The IR processor sends fault data and
status data out on ARINC 429 data buses.
IR faults cause the IR processor to set the FAULT discrete.
Power supply faults cause the IR processor to set the DC FAIL
or the ON DC discretes.
Alignment problems cause the IR processor to set the ALIGN
discrete to an intermittent flash.
ADIRS - ADIRU FUNCTIONAL DESCRIPTION
EFFECTIVITY
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ADIRS - ADIRU FUNCTIONAL DESCRIPTION
ADIRS - ADIRU FUNCTIONAL DESCRIPTION
EFFECTIVITY
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General
These are the indications on the CDS when the ADIRU is in the
align mode:
* The PFD shows no computed data (NCD) indications for
attitude, heading, and track data
* The PFD shows NCD indication for vertical speed
* The ND shows NCD indications for track and heading data.
Air data from the ADIRU is not affected by the inertial reference
(IR) mode of operation. The PFD shows air data information on
the speed tape and altitude tape.
ADIRS - PFD AND ND INDICATIONS DURING ALIGNMENT
EFFECTIVITY
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ADIRS - PFD AND ND INDICATIONS DURING ALIGNMENT
ADIRS - PFD AND ND INDICATIONS DURING ALIGNMENT
EFFECTIVITY
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General
When the ADIRU alignment is complete and the ADIRU is in the
NAV mode, the PFD and ND show ADIRU inertial reference (IR)
data. The PFD shows this data:
* Horizon and sky/ground shading
* Pitch scale
* Bank (roll) pointer
* Slip/skid indicator
　
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