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Cirrus Perspective™ Line Maintenance Manual
Page 7-9
190-00920-00
Rev.
E
7.2.2
GMA
Testing
An
in
‐
aircraft
checkout
may
be
performed
in
the
aircraft
on
the
ramp
with
known
good
microphone,
headset,
and
speaker.
7.2.2.1
Intercom
System
(ICS)
and
Music
Input
Check
1.
Plug
in
headsets
at
each
ICS
position.
2.
Make
sure
the
MAN
SQ
key
is
off
(no
LED).
If
the
LED
is
on,
toggle
it
off
by
pressing
and
holding
the
pilot
side
volume
knob
until
the
LED
turns
off.
3.
Adjust
the
volume
for
each
position
and
confirm
that
the
ICS
is
working
properly.
Rear
passenger
volume
is
controlled
by
pulling
the
co
‐
pilot
volume
knob
to
the
outer
detent
position.
4.
Check
Pilot
and
Copilot
ICS
positions
for
isolation
and
proper
operation
of
volume
and
squelch
controls.
5.
Input
Music
1
and
Music
2
inputs
and
check
for
proper
operation
at
all
headphone
locations.
7.2.2.2
Transceiver
Operational
Check
Perform
a
ramp
test
radio
check
by
operating
the
installed
transceivers,
microphone,
microphone
key
and
audio
over
the
headphones
and
speaker.
Verify
that
communications
are
clear
and
PTT
operation
is
correct
for
each
pilot
position.
1.
Select
the
audio
source
corresponding
to
each
installed
avionics
unit
(i.e.
NAV1,
NAV2,
COM1,
COM2)
and
check
for
audio
over
the
headsets.
2.
Press
the
SPKR
key
and
verify
that
the
selected
audio
is
heard
over
the
speaker.
7.2.2.3
Failsafe
Operation
Check
1.
Turn
the
GMA
347
off
by
pulling
the
AUDIO
circuit
breaker.
This
directs
all
COM
1
phone
audio,
MIC
audio
and
MIC
key
to
the
pilot’s
position.
2.
Check
the
failsafe
operation
by
operating
the
COM
1
microphone,
microphone
key
and
audio
over
the
headphones.
All
volume
control
for
the
COM
audio
should
be
through
the
PFD/GCU478
volume
controls.
Verify
proper
operation
of
COM
1
using
the
failsafe
operation.
3.
Close
the
AUDIO
circuit
breaker
and
continue
testing.
Summary of Contents for Cirrus Perspective SR20
Page 2: ......