PRIMUSr 1000 Integrated Avionics System
A28--1146--112--00
A--11/(A--12 blank)
AHZ--800 Attitude and Heading Reference System (AHRS)
TAKEOFF IN DG MODE
Takeoff with one AHRS in the DG mode is not recommended. Return
thesystemto the normal slavedmode bysetting theMAG/DG toMAG.
NOTE: If a third heading source is available, it can be used as the
primarydatain place of theAHRS ,ifslaved operationcannot
be achieved.
FLIGHT OPERATIONS IN BASIC MODE
If a malfunction causes the AHRS to revert to the basic mode, it is
annunciated on the EICAS. Normal flight operations can be continued
in the basic mode subject to the limitationsof the aircraft flight manual.
Inthebasicmode,thepilotmustavoidsustained,shallowbankedturns
of less than 6° (e.g., a constant turn toholdDMEarc).Keeptheaircraft
properly trimmed.
NOTE: Ifanattitudeerrordevelopswhile in the basicmode, itcannot
beremovedbythepilot.Thesystemattemptsto maintain the
error within bounds.
FLIGHT OPERATIONS IN DG MODE
If a heading flag is observed during a flight, set the MAG/DG switch to
DG.
The AHRS heading must be checked every 5 minutes with reference
to a known accurate heading source. Any errors can be removed by
using the INC/DEC switch to set the heading card to agree with the
known reference.
IN--AIR INITIALIZATION
In--air initialization is not recommended. If it is necessaryto perform an
in--air initialization, the aircraft must be maintained in wings--level
unaccelerated flight during the alignment. In the air, alignment time is
normally 15 seconds. Both power source circuit breakers must be
pulled to restart the system.
NOTE: Since the AHRS continuously attempts to realign itself, if it
doesnot,pullingthecircuitbreakerstoforcearestartmaynot
be successful.
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