__________________________________________________________________
Cirrus Perspective™ Line Maintenance Manual
Page 8-1
190-00920-00
Rev.
E
SECTION
8
RETURN
TO
SERVICE
TESTING
The
tests
described
in
this
section
test
various
secondary
communications
paths
to
ensure
that
the
desired
backup
paths
are
in
place.
Before
starting,
create
a
simple
direct
‐
to
flight
plan
to
an
airport
or
other
waypoint
that
is
greater
than
31
NM
from
the
present
aircraft
position.
Make
sure
the
phase
of
flight
displayed
on
the
GPS
CDI
is
ENR.
8.1
GPS
TESTING
8.1.1
Single
GPS
Test
Procedure
1.
Place
a
shroud
over
the
GIA1
GPS
antenna
to
prevent
signal
reception.
Verify
the
loss
of
signal
on
MFD
AUX
page.
Remove
the
shroud.
2.
Place
a
shroud
over
the
GIA2
GPS
antenna
to
prevent
signal
reception.
Verify
the
loss
of
signal
on
MFD
AUX
page
3.
Remove
the
shroud.
3.
The
following
shall
remain
valid
on
the
PFD:
•
Attitude
and
Heading
from
AHRS.
•
Airspeed,
Altitude,
Vertical
Speed,
and
OAT
from
Air
Data
Computer.
•
GPS
Course
Deviation
Indicator
remains
valid
on
PFD.
•
Press
the
ALERTS
softkey
and
verify
that
the
‘AHRS1
GPS
–
AHRS
using
backup
GPS
source'
alert
is
given.
(GPS1
failure
only).
8.1.2
Dual
GPS
Test
Procedure
1.
Cover
both
GPS
antennas.
Verify
the
loss
of
signal
on
MFD
AUX
page
3.
Check
for
desired
results.
2.
Remove
shrouds.
Allow
both
receivers
to
re
‐
acquire
satellite
signals
before
continuing.
3.
The
following
shall
occur
for
a
dual
GPS:
•
GPS
CDI
is
removed.
•
HSI
flags
DR
on
PFD,
all
GPS
data
AMBER.
•
Attitude
and
Heading
remain
valid
from
AHRS.
•
Airspeed,
Altitude,
Vertical
Speed,
and
OAT
remain
valid
from
Air
Data
Computer.
•
GPS
NAV
LOST
alert
given
(press
ALERTS
softkey)
•
TAWS
N/A
aural
alert
&
annunciation
given.
•
When
GPS
satellites
are
re
‐
acquired,
verify
that
the
INTEG
OK
annunciation
is
given
on
the
HSI
in
white
for
a
brief
period
then
disappears.
Summary of Contents for Cirrus Perspective SR20
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