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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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AIR DATA INERTIAL REFERENCE SYSTEM - INTRODUCTION
AIR DATA INERTIAL REFERENCE SYSTEM - INTRODUCTION
EFFECTIVITY
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AIR DATA INERTIAL REFERENCE SYSTEM - INTRODUCTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The air data inertial reference system (ADIRS) supplies these
type of data to the aircrew and to the airplane systems:
* Altitude
* Airspeed
* Temperature
* Heading
* Attitude
* Present position.
The ADIRS has these components:
* Air data modules (ADMs) (4)
* Total air temperature (TAT) probe
* Angle of attack (AOA) sensors (2)
* Inertial system display unit (ISDU)
* Mode select unit (MSU)
* Air data inertial reference unit (ADIRU) (2)
* IRS master caution unit.
Functional Description
The TAT probe measures the outside air temperature. It
changes the temperature value to an electrical signal. The
electrical signal goes to the ADIRUs.
The AOA sensors measure and convert angle of attack to
electrical signals. The electrical signals go to the ADIRUs.
The ISDU supplies initial position and heading data to the
ADIRUs. It also supplies this data to the flight crew:
* Present position
* Heading
* Navigation
* Performance
* Status.
The MSU gives mode selection data to the ADIRUs. It also
shows system operational and fault status to the flight crew.
The two ADIRUs calculate and send air data and inertial
reference information on ARINC 429 data buses. Each ADIRU
has two parts. One part is the air data reference (ADR) part. The
other is the inertial reference (IR) part.
The ADIRUs use these inputs to calculate air data:
* Pitot pressure
* Static pressure
* Total air temperature
* Angle of attack
* Common display system (CDS) barometric correction
* IR data.
Each ADIRU uses three accelerometers and three laser gyros
to calculate inertial reference (IR) data. Initial present position
information goes to the ADIRUs from the ISDU, or the flight
management computer system (FMCS).
ADIRS - GENERAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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The IRS master caution unit sends fail discretes to the flight
compartment master caution system.
ADIRS - GENERAL DESCRIPTION
EFFECTIVITY
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ADIRS - GENERAL DESCRIPTION
ADIRS - GENERAL DESCRIPTION
EFFECTIVITY
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General
These are the ADIRS components in the flight compartment:
* Inertial system display unit (ISDU)
* Mode select unit (MSU)
* IRS master caution annunciator.
These are the components in the flight compartment that have
an interface with the ADIRS:
* Left inboard and outboard display units
* Right inboard and outboard display units
* Upper center display unit
* IRS select switch
* Control display unit (CDU) 1 and 2
* Radio magnetic indicator (RMI)
* Left and right EFIS control panels.
ADIRS - COMPONENT LOCATION - FLIGHT COMPARTMENT
EFFECTIVITY
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ADIRS - COMPONENT LOCATION - FLIGHT COMPARTMENT
ADIRS - COMPONENT LOCATION - FLIGHT COMPARTMENT
EFFECTIVITY
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General
THE IRS master caution unit is in the flight compartment on the
　
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