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Cirrus Perspective™ Line Maintenance Manual
Page 5-53
190-00920-00
Rev.
E
5.6.3
Cooling
Alerts
NOTE
The
following
alerts
only
apply
if
the
cooling
fan
inputs
are
configured
on.
Message
Cause
Solutions
MFD1
COOLING
–
has
poor
cooling.
Reducing
power
usage.
The
MFD
has
exceeded
its
operating
temperature
range.
•
Check
cooling
fan
and
wiring
for
proper
operation.
−
Replace
cooling
fan
if
unable
to
determine
if
operating
correctly.
•
If
problem
persists,
replace
the
MFD.
PFD
COOLING
–
has
poor
cooling.
Reducing
power
usage.
PFD
has
exceeded
its
operating
temperature
range.
•
Check
cooling
fan
and
wiring
for
proper
operation.
−
Replace
cooling
fan
if
unable
to
determine
if
operating
correctly.
•
If
problem
persists,
replace
the
PFD.
5.6.4
Key
Alerts
Message
Cause
Solutions
MFD1
“key”
KEYSTK
–
key
is
stuck.
The
system
has
determined
a
key
is
stuck
on
the
MFD.
•
Go
to
the
GDU
TEST
page
in
configuration
mode
and
see
if
the
key
is
stuck
(if
the
key
is
stuck
the
corresponding
indicator
will
be
green).
•
Exercise
suspected
stuck
key
and
reset
GDU
TEST
page
to
see
if
indicator
remains
green
without
pressing
the
key.
•
If
problem
persists,
replace
the
display.
PFD
“key”
KEYSTK
–
key
is
stuck.
The
system
has
determined
a
key
is
stuck
on
PFD.