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OPERATIONAL MODES
CONTENTS
Normal Mode
Erase Mode
Test Mode
FAA/CAA Option
Self Examination
TMUCOMR03 LEVEL 3
EFFECTIVITY 23-71-00 Page 1
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 161
ALL
COCKPIT VOICE RECORDER OPERATIONAL MODES
NORMAL MODE
In normal mode, the cockpit voice recorder records,
on four independent channels, the audio signals from
the captain, first officer and 3rd occupant via the
Audio Management Unit (AMU). Channel 4 records the
ambient noise picked up by the area microphone and fed
via a pre-amplifier to the CVR.
ERASE MODE
The Recorder ERASE pushbutton must be pressed in for
a minimum of two seconds to prevent inadvertent
erasure.
The erase head erases the previously recorded
information on all 4 channels simultaneously, before
a new recording is made.
ERASE is only possible, aircraft on the ground, R and
L main landing gear shock absorbers compressed and
parking brake applied.
NOTE: If the engines are shut down, the CVR must first
be energized by pressing the GND CTL pushbutton
on the RCDR panel.
TEST MODE
The CVR TEST is initiated by pressing the CVR TEST
pushbutton on the RCDR panel.
A 600 HZ test tone is applied sequentially during 0.8s
to each of the four tracks.
Provided the aircraft is on ground, the signal should
be heard through the headsets. The signal should also
be heard through the loudspeakers if the R and L main
landing gear shock absorbers are compressed and the
parking brake is applied.
NOTE: Prior to this test, the CVR must be energized
by pressing the GND CTL pushbutton with the
engines not running.
TMUCOMR03-T01 LEVEL 3
EFFECTIVITY 23-71-00 Page 2
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 162
ALL
COCKPIT VOICE RECORDER OPERATIONAL MODES - TEST MODE
TMUCOMR03-P01 LEVEL 3
EFFECTIVITY 23-71-00 Page 3
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 163
ALL
COCKPIT VOICE RECORDER OPERATIONAL MODES
FAA/CAA OPTION
A jumper strap fitted on the AMU enables FAA/CAA
recording selection.
In FAA mode, only communications sent out by the crew
members are recorded. This is obtained by recording
of side tone signal : Audio output.
In CAA mode, the Captain, First Officer, and Third
Occupant microphones are "HOT" (PTT not activated) at
all times for voice/noise pick-up to reinforce the
sounds picked-up by the area mike.
However, in CAA mode, as in FAA mode, the signal
received in the crew’s earphones is recorded on the
CVR.
TMUCOMR03-T02 LEVEL 3
EFFECTIVITY 23-71-00 Page 4
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 164
ALL
COCKPIT VOICE RECORDER OPERATIONAL MODES - FAA / CAA OPTION
TMUCOMR03-P02 LEVEL 3
EFFECTIVITY 23-71-00 Page 5
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
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ALL
SELF EXAMINATION
A/C on ground and engines shutdown, what are the
conditions to erase the CVR recordings ?
A - Press the CVR ERASE pushbutton for 10
seconds.
B - Press the GND CTL pushbutton, make sure
that parking brake is applied and press
the CVR ERASE pushbutton for 2 seconds.
C - Start at least one engine and press on
the GND CTL pushbutton for 2 seconds.
TMUCOMR03 LEVEL 3
EFFECTIVITY 23-71-00 Page 6
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 166
ALL
23 - COMMUNICATIONS
23-71-00 COCKPIT VOICE RECORDER
ELECTRICAL SCHEMATIC
CONTENTS:
In Flight
On Ground
Manual Mode
Self Examination
TMUCOMS01 LEVEL 3
EFFECTIVITY 23-71-00 Page 1
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 167
ALL
COCKPIT VOICE RECORDER ELECTRICAL SCHEMATIC
IN FLIGHT
The CVR is automatically supplied when the aircraft
is in flight with engines running or stopped.
TMUCOMS01-T01 LEVEL 3
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