Learjet 60 - Cockpit Voice Recorder (CVR); Flight Data Recorder (FDR); Miscellaneous

Pilot's Manual

Learjet 60
MISCELLANEOUS
COCKPIT VOICE RECORDER (CVR)
A
cockpit voice
recording
system is installed to record
all
cockpit voice,
radio communication, aural
annunciation,
and aural navigation
signals
for
the last 30 minutes of recorded operation
.
System components con-
sist of a CVR
TEST
switch, a CVR
ERASE
switch, a headphone jack, a
microphone and a voice recorder unit .
The
CVR
TEST
switch, CVR
ERASE
switch and headphone jack are
installed on the pedestal
.
The
area microphone, installed
in
the center of the instrument panel,
picks up
all
cockpit audio .
The
microphone incorporates electronic
background noise suppression
.
The
voice recorder unit contains a converter that converts audio
input
to
digital
format .
The digital
format audio is stored
in
a crash-
survivable solid-state
memory . The digital
storage unit has a
maximum
recording
interval of 30 minutes .
After
30 minutes of continuous re-
cording,
the recorder automatically starts
recording
over the previous-
ly
stored audio data .
Squat switch,
parking
brake and anti-skid ON interlock
switching
control the bulk erasure function
.
Voice recorder system power is 28 VDC supplied through the 3-amp
CVR circuit breaker on the copilot's circuit breaker
panel . The
CVR
will
be operative
during EMER
BUS operations .
FLIGHT DATA RECORDER (FDR)
The flight
data recorder
will
record pertinent
flight profile
data .
A
white
FDR FAIL
annunciator is installed
in
the
warning lights annun-
ciator
panel
to annunciate system malfunctions .
The
system is powered
by 28 VDC through the 3-amp
FDR
circuit breaker on the pilot's circuit
breaker
panel
and is powered by the
Emergency
Bus .
The Flight
Data Recorder is functional whenever power is applied to
the aircraft .
There
are no controls or switches associated with the
FDR
and operation is completely automatic .
Upon power application to the aircraft, the system
will perform
a
self-
test . When the
BATTERY
switches are set to
on,
the
FDR FAIL annun-
ciator
will illuminate briefly,
then
extinguish . The
test
will
continue
for
another 60 seconds and the
light
should not come back on
during
the
test .
5- 6
2 PM-123
Change 5