SPZ--8000 Digital Integrated Flight Control System
A28--1146--055
REV 2
A--3
LASEREF
R
II/III Inertial Reference System (IRS)
INERTIAL REFERENCE UNIT (IRU)
The IRU is the main electronics assembly of the IRS. The IRU contains
an inertial sensor assembly, microprocessors, power supplies, and
aircraft electronic interfaces.
Accelerometers and laser gyros in the inertial sensor assembly
measure aircraft accelerations and angular rates.
The IRU microprocessors compute parameters for the flight control and
display instruments.
The power supplies receive ac and dc power from the aircraft and
backup battery, supply power to the IRS, and switch to primary ac,
primary dc, or backup battery power.
The aircraft electronic interfaces convert ARINC and avionics standard
communications bus (ASCB) inputs that are used by the IRS. The
electronic interfaces also transmit IRS outputs in ARINC and ASCB
formats for use by the associated aircraft equipment.
A fault ball indicator and a manual INTERF ACE TEST switch are
mounted on the front of the IRU. They are visible when the IRU is
mounted in an avionics rack.
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