SPZ--8000 Digital Integrated Flight Control System
A28--1146--055
REV 2
A--5
LASEREF
R
II/III Inertial Reference System (IRS)
D NAV--To--ALIGN--To--NAV -- The IRU enters ALIGN downmode
from the NAV mode and, after 30 seconds, automatically re--enters
the NAV mode when the downmode alignment is complete.
D AL I G N-- To-- AT T O r NAV -- To -- ATT -- The IRU enters the erect
attitude submode for 20 seconds. In the erect attitude submode, the
MSU ALIGN annunciator lights. The IRU then enters the attitude
mode.
D ATT--To--ALIGN Or ATT--To--NAV -- Once the mode select switch
has been set to ATT, the IRU remains in the attitude mode even if
the mode select switch is reset to ALIGN or NAV. The mode select
switch must be set to OFF for at least 3 seconds before the ALIGN
or NAV mode can be re--established.
D ATT--, NAV--, Or ALIGN--To--OFF -- After a 3--second delay, the IRU
enters the power--off submode for approximately 7 seconds. At the
end of 10 seconds, the IRU enters the OFF mode.
D ATT--, NAV--, Or ALIGN--To--OFF--To--ALIGN, --NAV, Or --ATT --
If the mode select switch is reset to ALIGN, NAV, or ATT after being
in the OFF position for 3 seconds but before the 10--second
power--down procedure has been completed, the IRU completes
the power--down procedures and then restarts power--on
procedures.
Annunciators
The triple--channel MSU contains the following annunciators:
D ALIGN -- The ALIGN annunciator indicates that the IRU is in the
align mode. A flashing ALIGN annunciator indicates an incorrect
latitude/longitude has been entered, or that excessive aircraft
movement has occurred during alignment.
D NAV RDY -- The navigation ready (NAV RDY) annunciator indicates
that alignment is complete.
D ON BATT -- The on battery (ON BATT) annunciator indicates that
backup battery power is being used.
D FAULT -- The F AULT annunciator indicates an IRS fault.
D NO AIR -- The NO AIR annunciator indicates cooling airflow is
inadequate to cool the IRU.
D BATT FAIL -- The BATT F AIL annunciator indicates that backup
battery power is inadequate to sustain IRS operation during backup
battery operation.
Test Switch
When the MSU TEST switch is pushed, the system starts the IRU test
mode.
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