____________________________________________________________________
Page 5-72
Cirrus Perspective™ Line Maintenance Manual
Rev. E
190-00920-00
5.9.2
GRS
77
Related
Alerts
Message
Cause
Solutions
AHRS1
TAS
–
AHRS1
not
receiving
airspeed.
The
GRS
77
#1
is
not
receiving
airspeed
information
from
the
GDC
74A
#1.
•
Check
GRS
#1/GDC
74A
#1
interconnect.
•
Replace
the
GDC
74A
#1
•
If
problem
does
not
clear,
replace
the
GRS
77
#1
AHRS2
TAS
–
AHRS2
not
receiving
airspeed.
The
GRS
77
#2
is
not
receiving
airspeed
information
from
the
GDC
74A
#2.
•
Check
GRS
#2/GDC
74A
#2
interconnect
•
Replace
the
GDC
74A
#2
•
If
problem
does
not
clear,
replace
the
GRS
77
#2
AHRS1
GPS
–
AHRS1
using
backup
GPS
source.
GRS
77
#1
is
using
a
backup
GPS
source.
•
Make
sure
a
cell
phone
or
a
device
using
cell
phone
technology
is
not
turned
on
(even
in
a
monitoring
state)
in
the
cabin.
•
Check
GPS
status
for
GIA
1
and
2
on
MFD
‐
AUX
GPS
STATUS
page.
If
one
or
both
GPS
receivers
cannot
acquire
a
position
lock.
Troubleshoot
GPS
problems
using
Sections
5.1.2
and
5.6.2.
•
Replace
the
GRS
77.
AHRS1
GPS
–
AHRS1
not
receiving
backup
GPS
information.
GRS
77
#1
is
not
receiving
backup
GPS
information
from
either
GIA
63W.
AHRS1
GPS
–
AHRS
operating
exclusively
in
no
‐
GPS
mode.
The
GRS
77
is
operating
in
the
absence
of
GPS.
AHRS1
GPS
–
AHRS1
not
receiving
any
GPS
information.
GRS
77
#1
is
not
receiving
GPS
data
from
either
GIA
63W.
AHRS2
GPS
–
AHRS2
using
backup
GPS
source.
GRS
77
#2
is
using
a
backup
GPS
source.
•
Make
sure
a
cell
phone
or
a
device
using
cell
phone
technology
is
not
turned
on
(even
in
a
monitoring
state)
in
the
cabin.
•
Check
GPS
status
for
GIA
1
and
2
on
MFD
‐
AUX
GPS
STATUS
page.
If
one
or
both
GPS
receivers
cannot
acquire
a
position
lock.
Troubleshoot
GPS
problems
using
Sections
5.1.2
and
5.6.2.
•
Replace
the
GRS
77.
AHRS2
GPS
–
AHRS2
not
receiving
backup
GPS
information.
GRS
77
#2
is
not
receiving
backup
GPS
information
from
either
GIA
63W.
AHRS2
GPS
–
AHRS2
operating
exclusively
in
no
‐
GPS
mode.
The
GRS
77
#2
is
operating
in
the
absence
of
GPS.
AHRS2
GPS
–
AHRS2
not
receiving
any
GPS
information.
GRS
77
#2
is
not
receiving
GPS
data
from
either
GIA
63W.
AHRS1
SRVC
–
AHRS1
magnetic
field
model
needs
update.
AHRS
#1
magnetic
field
model
has
expired.
•
Reference
Garmin
SB
0533
for
update
instructions.
AHRS2
SRVC
–
AHRS2
magnetic
field
model
needs
update.
AHRS
#2
magnetic
field
model
has
expired.
Summary of Contents for Cirrus Perspective SR20
Page 2: ......