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(CPC) 1 and 2 to calculate pressurization values:
* Corrected baro altitude
* Uncorrected baro altitude
* Static pressure.
WXR R/T
The ADIRU sends true airspeed data to the WXR R/T for
predictive windshear calculations.
FMCS
The ADIRU sends this ADR data to the FMCS:
* Computed airspeed
* True airspeed
* Mach
* Corrected baro altitude
* Uncorrected baro altitude
* Total air temperature
* Static air temperature.
The FMCS uses this data for performance and guidance
calculations.
ADIRS - RIGHT AIR DATA OUTPUTS
EFFECTIVITY
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ADIRS - RIGHT AIR DATA OUTPUTS
ADIRS - RIGHT AIR DATA OUTPUTS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-013
General
The IRS transfer switch on the instrument switching module
selects the ADIRU to supply inertial reference (IR) data to
components and systems. The IRS transfer switch does not
affect air data reference (ADR) signals.
IRS Transfer Switch
The IRS transfer switch is a three-position switch. These are the
three positions:
* Normal
* Both on L
* Both on R.
The normal position sends discrete signals that tell the
components to use their usual source of IR data.
The BOTH ON L and BOTH ON R switch positions tell the
components to use only left IR data or only right IR data.
The CDS display electronics units (DEUs) cause the INSTR
SWITCH message to show on the display units when the IRS
transfer switch is in the BOTH ON L or BOTH ON R position.
IFSAU Relay
The position of a relay in the integrated flight systems
accessory unit (IFSAU) sets the source of IR data to the flight
data acquisition unit (FDAU). The usual source of IR data is the
left ADIRU. Set the IRS transfer switch to BOTH ON R to
energize the relay in the IFSAU. The energized relay sets the IR
data source to the right ADIRU.
ADIRS - IR SIGNAL SWITCHING
EFFECTIVITY
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34-21-00-014
ADIRS - IR SIGNAL SWITCHING
ADIRS - IR SIGNAL SWITCHING
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-014
General
The air data inertial reference unit (ADIRU) has two functions:
* Air data reference (ADR) calculations
* Inertial reference (IR) calculations.
The ADIRU has three parts. These are the three parts:
* Power supply
* Air data
* Inertial reference.
Physical Properties
These are the physical properties of the ADIRU:
* Length - 15.12 inches
* Width - 4.88 inches
* Height - 7.64 inches
* Weight - 28 pounds
* Power - 69 watts AC, 64 watts DC steady state.
Power Supply
The power supply is the only part of the ADIRU used by both the
ADR function and the IR function. The power supply receives
115v ac and 28v dc from the airplane buses and supplies
operating voltages to the ADR and IR.
Air Data Reference
The ADR function receives digital inputs of pitot and static
pressure from the air data modules and temperature inputs
from the total air temperature probe. It uses these inputs to
calculate the air data parameters. It also receives analog inputs
from the AOA vane for error correction.
Inertial Reference
The inertial reference function has three accelerometers and
three laser gyros which sense motion and angular movements.
The IR function uses these sensor signals to calculate these and
other parameters:
* Airplane attitude
* Heading
* Acceleration
* Position.
ADIRS - AIR DATA INERTIAL REFERENCE UNIT
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-017
ADIRS - AIR DATA INERTIAL REFERENCE UNIT
ADIRS - AIR DATA INERTIAL REFERENCE UNIT
EFFECTIVITY
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