DOC AIRBUS | AMM A320FAIR DATA/INERTIAL REFERENCE SYSTEM (ADIRS) - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The main air data and heading/attitude data are provided by a three-channel Air Data Inertial Reference System (ADIRS).
This configuration provides for triple redundant information for all inertial and air data functions.
Each channel is isolated from the others and provides independent information as defined by ARINC Characteristic 738.
The ADIRS comprises:
The Built-In Test Equipment (BITE) is included in the ADIRUs and the ADMs.
It detects and identifies a failure related to the ADIRS and reports it to the Centralized Fault Display System (CFDS) (ATA 34-18).
A three-channel Air Data Inertial Reference System (ADIRS) supplies the primary air data and heading/attitude data.
This configuration has triple redundant data for all the inertial and air data functions.
Each channel is isolated from the other channels and supplies data independently as given in the ARINC Characteristic 738.
The ADIRS has:
The Built-In Test Equipment (BITE) is included in the ADIRUs and the ADMs.
It senses and identifies a failure related to the ADIRS and sends it to the Centralized Fault Display System (CFDS) (ATA 34-18).
The main air data and heading/attitude data are provided by a three-channel Air Data Inertial Reference System (ADIRS).
ADIRU - Block DiagramThis configuration provides for triple redundant information for all inertial and air data functions.
Each channel is isolated from the others and provides independent information as defined by ARINC Characteristic 738.
The ADIRS comprises:
- Three Air Data/Inertial Reference Units (ADIRU) (ATA 34-12)
- A control and Display Unit (CDU) (ATA 34-12)
- Three pitot probes (ATA 34-11)
- Six static probes (ATA 34-11)
- Eight Air Data Modules (ADM) Linked to the pitot and static probes (ATA 34-11)
- Two Total Air Temperature (TAT) sensors (ATA 34-11)
- Three Angle of Attack (AOA) sensors (ATA 34-11)
- The Air Data Reference (ADR) portion which supplies air data parameters (ATA 34-13)
- The Inertial Reference (IR) portion which supplies attitude and navigation parameters (ATA 34-14).
The Built-In Test Equipment (BITE) is included in the ADIRUs and the ADMs.
It detects and identifies a failure related to the ADIRS and reports it to the Centralized Fault Display System (CFDS) (ATA 34-18).
A three-channel Air Data Inertial Reference System (ADIRS) supplies the primary air data and heading/attitude data.
This configuration has triple redundant data for all the inertial and air data functions.
Each channel is isolated from the other channels and supplies data independently as given in the ARINC Characteristic 738.
The ADIRS has:
- Three Air Data/Inertial Reference Units (ADIRU) (ATA 34-12)
- A Mode Selector Unit (MSU) (ATA 34-12)
- Three pitot probes (ATA 34-11)
- Six static probes (ATA 34-11)
- Eight Air Data Modules (ADM) connected to the pitot and static probes (ATA 34-11)
- Two Total Air Temperature (TAT) sensors (ATA 34-11)
- Three Angle of Attack (AOA) sensors (ATA 34-11)
- The Air Data Reference (ADR) part which supplies air data parameters (ATA 34-13)
- The Inertial Reference (IR) portion which supplies attitude and navigation parameters (ATA 34-14).
The Built-In Test Equipment (BITE) is included in the ADIRUs and the ADMs.
It senses and identifies a failure related to the ADIRS and sends it to the Centralized Fault Display System (CFDS) (ATA 34-18).