____________________________________________________________________
Page 5-74
Cirrus Perspective™ Line Maintenance Manual
Rev. E
190-00920-00
5.10
GDC
74A
RELATED
ALERTS
AND
PROBLEMS
5.10.1
Common
Problems
Symptom
Recommended
Action
Altitude
is
different
than
standby
altimeter
•
Perform
a
pitot/static
check
(see
the
Cirrus
Maintenance
Manual
for
procedure).
Allow
the
GDC
74A
to
warm
up
for
fifteen
minutes
before
checking
accuracy,
see
Garmin
Service
Advisory
0606.
•
Determine
which
instrument
is
outside
limits
and
recalibrate
or
replace.
Note:
Both
units
may
individually
be
in
spec
but
show
a
difference
in
altitude.
Do
not
return
a
GDC
74A
to
Garmin
for
service
if
not
outside
limits.
•
If
GDC
is
outside
limits,
recalibration
may
be
performed
in
accordance
with
Section
5.9.
GDC
74A
Config
file
does
not
load.
•
Replace
GDC
74A
config
module.
•
If
problem
persists,
replace
GDC
74A
config
module
wire
harness.
5.10.2
GDC
74A
Related
Alerts
Message
Cause
Solutions
MANIFEST
–
GDC
74A#1
software
mismatch
Communication
halted.
The
system
has
detected
an
incorrect
software
version
loaded
in
the
GDC
74A
#1.
•
Load
correct
software
version.
MANIFEST
–
GDC
74A
#2
software
mismatch
Communication
halted.
The
system
has
detected
an
incorrect
software
version
loaded
in
the
GDC
74A
#2.
Summary of Contents for Cirrus Perspective SR20
Page 2: ......