__________________________________________________________________
Page 7-38
Cirrus Perspective™ Line Maintenance Manual
Rev. E
190-00920-00
NOTE
Due
to
the
difficulties
in
executing
smooth
and
accurate
turns,
the
PFD
may
incorrectly
interpret
a
station
and
instruct
to
“HOLD
POSITION”
prior
to
full
completion
of
a
30
°
turn.
If
this
scenario
occurs,
ignore
the
“HOLD
POSITION”
command
and
use
outside
references
to
complete
the
approximate
30
°
turn.
Instead
of
using
the
PFD
instruction
to
turn
as
a
real
‐
time
indication
of
when
to
turn,
simply
judge
the
30°
(±5°)
turn
increments
of
the
aircraft
by
using
the
compass
rose
radials.
Dwelling
at
these
30
°
increments
for
the
time
recommended
by
the
PFD
should
result
in
successful
calibration.
The
PFD
guides
the
operator
to
dwell
at
multiple
headings
around
a
complete
circle.
NOTE
Due
to
high
winds
or
excessive
airframe
vibration,
the
operator
may
encounter
a
condition
where
the
PFD
restarts
the
18
‐
second
countdown
without
full
completion
of
the
previous
countdown.
If
this
occurs
more
than
once
for
a
given
station,
begin
turning
to
the
next
station
(approximately
30
°
).
A
minimum
of
two
successful
stations
according
to
a
quadrant
is
required,
where
a
successful
station
is
a
full
18
‐
second
countdown
followed
by
instruction
to
move.
Ensure
that
at
least
two
stations
according
to
a
quadrant
are
completed.
It
may
sometimes
be
required
to
dwell
at
a
station
after
a
countdown
restart.
A
maximum
of
30
stations
is
allowed
for
the
entire
calibration
procedure.
If
too
many
countdown
restarts
occur,
the
calibration
will
fail
and
the
message
‘TOO
MANY
STATIONS’
is
displayed.
NOTE
Aircraft
rocking
from
excessive
winds
may
prevent
the
calibration
test
from
passing.
If
repeated
attempts
in
windy
conditions
do
not
pass,
wait
until
the
winds
calm
before
reattempting
the
procedure.
12.
Repeat
the
turn
‐
and
‐
stop
process
until
the
PFD
advises
that
a
successful
calibration
is
complete.
The
GRS
77
AHRS
then
enters
its
normal
operational
mode.
Press
the
ENT
button
on
the
PFD
to
conclude
the
procedure.
Summary of Contents for Cirrus Perspective SR20
Page 2: ......
