____________________________________________________________________
Page 5-6
Cirrus Perspective™ Line Maintenance Manual
Rev. E
190-00920-00
System
Annunciation
Troubleshooting
(continued)
Annunciation
Associated
LRU
Solution
HDG
FAIL
GRS
77
#1&
GMU
44
#1
or
Optional
GRS77
#2
&
GMU
#2
•
Check
PFD
Alert
Window
for
PFD,
MFD
or
GRS
configuration,
software
or
failed
data
path
error
messages.
Correct
any
errors
before
proceeding.
•
Check
for
metal
objects
(tool
boxes,
power
carts,
nearby
large
steel
structures,
etc.)
around
the
aircraft
that
could
be
interfering
with
the
magnetometer.
•
Make
sure
a
cell
phone
or
a
device
using
cell
phone
technology
is
not
turned
on
(even
in
a
monitoring
state)
in
the
cabin.
•
Cycle
power
after
moving
aircraft
away
from
metal
objects
to
determine
if
metal
objects
were
the
source
of
the
interference.
Allow
up
to
five
minutes
for
the
heading
to
reinitialize.
•
Is
the
aircraft
stationary
if
GPS
is
not
available?
Aircraft
movement
(rocking
the
wings
or
moving
the
tail)
may
cause
the
attitude
and
heading
to
fail
if
it
believes
the
aircraft
is
in
motion
without
GPS
input.
•
Perform
a
Magnetometer
Interference
Test
to
check
for
interference
from
onboard
electrical
system
components
(e.g.
NAV
lights).
Pay
attention
to
any
new
electrical
devices
that
have
been
installed
since
the
aircraft
was
new.
Correct
any
discrepancies
that
do
not
allow
this
test
to
pass
before
continuing.
•
Make
sure
the
GRS
77
and
GMU
44
connectors
are
secure.
•
Check
the
wiring
and
any
inline
connectors
between
the
GRS
and
GMU
for
faults.
•
Recalibrate
the
GMU
44.
•
Replace
the
GMU
44.
•
If
problem
persists,
replace
the
GRS
77.
Summary of Contents for Cirrus Perspective SR20
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