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Inertial reference data.
These are examples of some of the systems that use ADIRS data:
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Primary flight control system (PFCS)
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Autopilot flight director system (AFDS)
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Airplane information management system (AIMS).
Abbreviations and Acronyms
*
ADIRS -air data inertial reference system
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ADIRU -air data inertial reference unit
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ADM -air data module
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AFDC -autopilot flight director computer
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AFDS -autopilot flight director system
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AIMS -airplane information management system
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AOA -angle of attack
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ARINC -Aeronautical Radio, Inc.
*
CDU -control display unit
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CMCF -central maintenance computing function
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CPU -central processing unit
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FCA -fault containment area
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FCM -fault containment module
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FCDC -flight controls direct current
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FMCF -flight management computing function
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FPA -flight path angle
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FSEU -flap/slat electronics unit
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GPS -global positioning system
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LCD -liquid crystal display
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MAT -maintenance access terminal
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NCD -no computed data
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ND -navigation display
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NVM -non-volatile memory
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OPAS -overhead panel ARINC 629 system
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PFC -primary flight computer
*
PFCS -primary flight control system
*
PSEU -proximity sensor electronics unit
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SAARU -secondary attitude air data reference unit
*
TAT -total air temperature
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AIR DATA INERTIAL REFERENCE SYSTEM -INTRODUCTION
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ADIRS -GENERAL DESCRIPTION
General
The air data inertial reference system (ADIRS) has these components:
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Pitot probes
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Static port
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Air data modules
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Air data inertial reference unit (ADIRU)
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Total air temperature (TAT) probe
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Angle of attack (AOA) sensors
*
Secondary attitude air data reference unit (SAARU)
*
Standby attitude indicator.
Air Data Modules
The air data modules (ADMs) get air pressures from the pitot probes or the static ports. The ADMs convert the air pressures into ARINC 629 data. The ADMs send this data to the ADIRU and the SAARU.
Airplane Information Management System
The airplane information management system (AIMS) cabinets receive TAT and AOA analog inputs. The AIMS cabinets change this data to digital and send it to the ADIRU and the SAARU.
The AIMS cabinets receive display data from the ADIRS. The AIMS shows ADIRS data on the primary flight displays (PFDs) and the navigation displays (NDs).
Air Data Inertial Reference Unit
The air data inertial reference unit (ADIRU) uses these inputs to calculate and supply air data to user systems:
*
Pitot pressure
*
Static pressure
*
Total air temperature
*
Angle of attack.
The ADIRU uses six ring laser gyros and six accelerometers to calculate and supply inertial reference and navigation data to user systems.
Secondary Attitude Air Data Reference Unit
The secondary attitude air data reference unit (SAARU) is a back-up source of attitude, heading and air data. The SAARU uses these inputs to calculate and supply air data to user systems:
*
Pitot pressure
*
Static pressure
*
Total air temperature
*
Angle of attack.
The SAARU uses four fiber optic gyros and four accelerometers to calculate and supply inertial reference data to user systems.
The SAARU supplies attitude data to the standby attitude indicator.
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777 AIRCRAFT MAINTENANCE MANUAL
ADIRS -GENERAL DESCRIPTION
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ADIRS -COMPONENT LOCATION -FLIGHT DECK
ADIRS Component Location
The ADIRS components in the flight deck are:
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ADIRU switch
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ADIRU on battery light
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Standby attitude indicator.
Other Systems Component Location
The components in the flight deck that have an interface with the ADIRS are:
*
Left and right control display units (CDUs)
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