__________________________________________________________________
Page 7-34
Cirrus Perspective™ Line Maintenance Manual
Rev. E
190-00920-00
Figure
7
‐
8.
GRS/GMU
Calibration
Page
‐
GRS77
#2
This
procedure
must
be
carried
out
with
the
engine
off
and
the
aircraft
still.
Avoid
performing
any
other
maintenance
activity
or
entering/exiting
the
aircraft
during
this
procedure.
1.
Level
the
aircraft
to
1.2°
pitch
nose
up
and
wings
level.
2.
Initiate
the
AHRS
Ground
Pitch/Roll
Aircraft
Level
compensation
mode
by
performing
the
following
steps:
a)
Enter
Configuration
Mode
and
go
to
GRS/GMU
CALIBRATION
page
as
shown
in
Figure
7
‐
8.
b)
This
page
is
protected
and
requires
a
keystroke
password
to
perform
the
calibration.
Press
the
following
softkeys
in
sequence:
i)
softkey
9
ii)
softkey
10
iii)
softkey
11
iv)
softkey
12
c)
Ensure
that
the
No.
1
GRS
77
is
selected.
d)
Select
PITCH/ROLL
OFFSET,
then
press
the
ENT
key.
e)
Follow
the
checklist
items
which
are
displayed
and
press
the
ENT
key
as
each
one
is
completed
or
confirmed.
When
the
CALIBRATE
field
is
blinking,
press
the
ENT
key
to
begin
the
procedure.
f)
After
several
seconds,
a
new
checklist
appears
in
the
lower
half
of
the
PFD.
Press
the
ENT
key
as
each
item
is
confirmed.
When
the
‘CONFIRM
AIRCRAFT
IS
LEVEL’
field
is
blinking,
press
the
ENT
key
to
continue.
3.
The
result
of
the
pitch/roll
offset
compensation
is
displayed.
If
successful,
the
AHRS
records
the
required
pitch
and
roll
offsets,
informs
the
operator
of
a
successful
conclusion,
and
returns
to
normal
operation.
4.
Press
the
ENT
key
to
conclude
this
procedure.
Summary of Contents for Cirrus Perspective SR20
Page 2: ......