*
Left and right air data/attitude source switches.

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777 AIRCRAFT MAINTENANCE MANUAL

ADIRS -COMPONENT LOCATION -FLIGHT DECK

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ADIRS -COMPONENT LOCATION -EQUIPMENT CENTERS

ADIRS Component Locations
* STATIC ADM
These air data inertial reference system (ADIRS) components * PITOT ADM. are in the equipment centers:
*
Air data inertial reference unit (ADIRU)

*
Secondary attitude air data reference unit (SAARU)

*
ADIRU BAT PWR L, C, R circuit breakers

*
ADIRU PRI PWR L, C, R circuit breakers.

Other Systems Component Location
These components in the equipment centers have an interface with the ADIRS:
*
Left power supply assembly

*
Center power supply assembly

*
Right power supply assembly.

The left power supply assembly has these circuit breakers:
*
STATIC ADM

*
PITOT ADM

*
STBY IND.

The center power supply assembly has these circuit breakers:
*
STATIC ADM

*
PITOT ADM

*
STBY IND

*
SAARU.

The right power supply assembly has these circuit breakers:
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ADIRS -COMPONENT LOCATION -EQUIPMENT CENTERS

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ADIRS -COMPONENT LOCATION -AOA SENSORS AND TAT PROBE
General
The angle of attack (AOA) sensors are on both sides of the fuselage and the TAT probe is on the left side.
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ADIRS -COMPONENT LOCATION -AOA SENSORS AND TAT PROBE

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ADIRS -COMPONENT LOCATION -LEFT PITOT ADM
General
The left pitot ADM is in the left forward section of the main equipment center.
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ADIRS -COMPONENT LOCATION -LEFT PITOT ADM

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ADIRS -COMPONENT LOCATION -CENTER AND RIGHT PITOT ADM Right and Center Pitot Air Data Modules (ADMs)
The right and center pitot ADMs are in the MEC, to the right of the nose wheel well and under the flight deck.
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ADIRS -COMPONENT LOCATION -CENTER AND RIGHT PITOT ADM

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ADIRS -COMPONENT LOCATION -STATIC ADM AND STATIC SADM Static Air Data Modules (ADM)
The static ADMs are in the forward cargo compartment ceiling above the cargo liner.
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ADIRS -COMPONENT LOCATION -STATIC ADM AND STATIC SADM

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ADIRS -ADIRU, AOA AND SENSOR, SAARU, STANDBY ATTITUDE INDICATOR POWER

Air Data Inertial Reference Unit
The air data inertial reference unit (ADIRU) gets power from these sources:
*
Right 28 volt DC bus

*
Left 28 volt DC bus

*
Hot battery bus.

The PFC (primary flight computer)/ADIRU panel supplies on/off discretes to the ADIRU. The ADIRU uses these discretes to turn the ADIRU on and off.
AOA Sensors
One resolver in each AOA receive 28v ac power from the left (P110) and one resolver in each AOA receive 28v ac from the right (P210). The AIMS cabinets receive the same 28v ac for resolver reference.
SAARU
The secondary attitude air data reference unit (SAARU) gets 28v dc power from the SAARU circuit breaker on the center power supply assembly.
Standby Attitude Indicator
The standby attitude indicator gets 28v dc power through the STBY IND circuit breaker on the center power supply assembly. The 28v dc goes through the STBY INSTR -ATT circuit breaker in the P11 overhead circuit breaker panel.
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