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left static ADM. The right ADIRU supplies 13.5v dc to the right
ADMs.
Inertial System Display Unit
The inertial system display unit (ISDU) gets 28v dc from the left
and the right ADIRU.
IRS Master Caution Unit
The IRS master caution unit gets power from the 28v dc bat bus.
ADIRS - POWER
EFFECTIVITY
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ADIRS - POWER
ADIRS - POWER
EFFECTIVITY
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General
The ADIRUs operates with AC or DC power. AC power is the
normal power source. If the AC power source is not available,
DC power from the airplane battery will supply power to the
ADIRUs.
Left ADIRU DC Operation
When AC power is not available, the left ADIRU will operate on
DC power from the 28v dc sw hot battery bus. The left ADIRU
will continue to operate on DC power until the battery power is
less than 18v dc.
Right ADIRU DC Operation
DC power to the right ADIRU goes through a time delay circuit
in the integrated flight systems accessory unit (IFSAU). When
AC power is not available, a 5 minute time delay keeps the DC
power relay energized, and the right ADIRU operates on DC
power. After 5 minutes continuous operation on DC power, the
time delay circuit deenergizes the relay and DC power to the
right ADIRU is removed. This feature allows the airplane battery
to drain at a slower rate.
ADIRS - DC POWER OPERATION
EFFECTIVITY
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ADIRS - DC POWER OPERATION
ADIRS - DC POWER OPERATION
EFFECTIVITY
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General
The integrated flight systems accessory unit (IFSAU) contains a
circuit which causes the ground crew call horn to tell
maintenance personnel of unsafe ADIRU operation. This
occurs when the airplane is on the ground and the ADIRUs
are on dc power or when the equipment cooling system fails.
ADIRU DC Power Operation
The ADIRUs send 28v dc to the AND logic circuit in the IFSAU.
When an ADIRU senses that it is on dc power, it sends an ON
DC discrete to the IFSAU. The discrete goes through a 20
second delay to the AND gate logic. After twenty seconds of dc
operation, the AND gate supplies power to the crew call horn
relay. The relay energizes when the air/gnd relay is in the gnd
position. The energized crew call relay closes the relay switch,
and 28v dc power causes the horn to operate.
Equipment Cooling Failure
Two equipment cooling sensors monitor the cooling air flow to
the ADIRUs. A low flow relay in the sensor will close when the
cooling air flow fails. The closed relay lets 28v dc go to the
IFSAU. The 28v dc discrete goes through a 20 second delay to
the AND gate logic. After twenty seconds, the AND gate
supplies power to the crew call horn relay. The relay energizes
when the air/gnd relay is in the gnd position. The energized
crew call horn relay closes the relay switch, and 28v dc power
causes the horn to operate.
ADIRS - NO COOLING AND ON DC WARNING
EFFECTIVITY
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ADIRS - NO COOLING AND ON DC WARNING
ADIRS - NO COOLING AND ON DC WARNING
EFFECTIVITY
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General
These are the units that interface to supply control and warning
data to the pilots:
* ISDU
* MSU
* IRS master caution unit.
ISDU Interface
The ISDU supplies both ADIRUs with test discretes, heading
data, and present position data. The ADIRUs supply IR data and
fault data to the ISDU.
MSU Interface
The MSU supplies mode discretes to the ADIRUs. The ADIRUs
　
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