ADIRS -ADIRU, AOA AND SENSOR, SAARU, STANDBY ATTITUDE INDICATOR POWER
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ADIRS -AIR DATA MODULES POWER
General
The power supply assemblies supply power to their onside pitot and static air data modules (ADMs).
The left power supply assembly supplies power to the left static and pitot ADMs.
The center power supply assembly supplies power to the center static and pitot ADMs.
The right power supply assembly supplies power to the right static and pitot ADMs.
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777 AIRCRAFT MAINTENANCE MANUAL
ADIRS -AIR DATA MODULES POWER
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ADIRS -DIGITAL INTERFACES
General
These components send data to the ADIRU and the SAARU through the flight controls ARINC 629 buses:
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Left and right AIMS cabinets
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Left, center, right pitot air data modules (ADMs)
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Left, center, right static ADMs
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Left, center, right PFC.
Total Air Temperature (TAT) Probe
The TAT probe sends analog temperature data to the left and right AIMS cabinets. The AIMS cabinets change the temperature data to ARINC 629 data. The AIMS cabinets send the temperature data to the ADIRU and the SAARU.
Angle of Attack (AOA) Sensors
The AOA sensors send the AOA resolver data to the left and right AIMS cabinets. The AIMS cabinets change the resolver data to ARINC 629 data. The AIMS cabinets send the AOA resolver data to the ADIRU and the SAARU.
FSEU and PSEU Data
The flap/slat electronic units (FSEUs) supply flap data and the proximity sensor electronic units (PSEUs) supply landing gear position to the AIMS cabinets. The AIMS cabinets send this data to the ADIRU and SAARU. The ADIRU and SAARU use this data to calculate corrected AOA data.
EFFECTIVITY
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Pitot Probes
The pitot probes send total pressure to the pitot air data modules (ADMs). The pitot ADMs change the total pressure to ARINC 629 data. The pitot ADMs send the pitot pressure data to the ADIRU and the SAARU.
Static Ports
The static ports measure the static air pressure and send it through lines to the static ADMs. The static ADMs receive this pressure information and change it to ARINC 629 data. The static ADMs send the static air pressure data to the ADIRU and the SAARU.
PFC Data
The ADIRU and SAARU use speed brake position and air/ ground data that comes from the PFCs. The ADIRU and SAARU use this data to calculate corrected AOA data. The AFDCs are the alternate source of air/ground and brake position if the PFCs fail.
ADIRU
The ADIRU receives data on all flight control ARINC 629 buses. The ADIRU has two connections to each flight control ARINC 629 bus.
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ADIRS -DIGITAL INTERFACES
The ADIRU sends air data and inertial reference data to user systems through the left and right flight control ARINC 629 buses.
SAARU
The SAARU receives data on all flight control ARINC 629 buses. The SAARU has one connection to each flight control ARINC 629 bus.
The SAARU sends inertial reference and air data to user systems through the center flight control ARINC 629 bus.
Standby Attitude Indicator
The SAARU supplies ARINC 429 attitude data to the standby attitude indicator.
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ADIRS -DIGITAL INTERFACES
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ADIRS -ADIRU
General
The air data inertial reference unit (ADIRU) has two functions:
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Air data
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Inertial reference data.
The ADIRU has internal redundancy and automatically makes allowances for failures to keep its complete function.
Physical Description
The ADIRU weighs 68 pounds. The ADIRU is 22.75 inches wide,
7.64 inches high, and 13.61 inches deep.
The ADIRU has these features:
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2 front handles
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Passive cooling fins
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A locking bar
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2 installation screws
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Installation guide
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3 ARINC 629 connectors
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3 power connectors
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2 side handles.
The ADIRU has these internal components:
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