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For Training Purposes Only
Sept 04
6-23
P I LOT T R A I N I N G GU I D E
CVR Control Unit
The CVR control unit contains a meter, an ERASE and a TEST Pushbutton, and a
headset monitor jack.
Microphone
The remote area microphone is mounted on the overhead panel behind a grille. The
microphone picks up flight compartment conversations and sounds, and feeds them
into the recorder.
Controls and Indicators
For controls and indicators, refer to the CVR control unit section.
Cockpit Voice Recorder Panel
Figure 6-14
HEADSET
COCKPIT VOICE
RECORDER
ERASE
HOLD
5 SEC
TEST
Test Pushbutton Switch
Press to test Voice Recorder System. A green light
will illuminate. If headset is plugged into unit, a test
tone will be heard.
Erase Pushbutton Switch
When pressed for at least two seconds, erases all
recorded information, provided the airplane has landed
and the parking brake is set.
Headset Monitor Jack
With headset plug in, allows monitoring of tone
transmission during test and audio signals
being recorded.
P604_06_014
COMMUNICATIONS
6-24 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
Operation
The CVR constantly records when power is supplied to the system. The only way to
preserve specific recorded information is to pull the CVR circuit breaker or otherwise
shut down the system.
Test
Incorporated into the CVR is a built-in-test-equipment (BITE) utility program which
provides a go/no-go indication.
The self-test is initiated by pressing the TEST Pushbutton on the CVR control unit.
This causes a test tone to be applied to each channel individually. The test tone is
processed, stored in memory and read from memory. The tone is then checked for
expected frequency and amplitude.
Visual indication of the test is provided on the test meter. The test meter provides an
indicator signal which is the go/no-go display.
The phone jack permits monitoring of the actual recorded audio as well as the tone
bursts during test.
Erase
The ERASE Pushbutton will bulk-erase the entire memory, provided that the parking
brake is set and the WOW interlocks are closed. The bulk-erase Pushbutton must be
held for more than two seconds for the bulk-erase to take place.
COMMUNICATIONS
For Training Purposes Only
May 03
6-25
P I LOT T R A I N I N G GU I D E
Flight Data Recorder System
Description
The flight data recorder (FDR) is a solid-state system that records airplane flight
parameters for future retrieval and analysis.
The FDR puts a digital stream of data from the data concentrators into a solid-state
memory module which has a capacity to retain 25 hours of data. When the memory
module is full, the data is progressively overwritten by the most recent data being
recorded.
Components and Operation
The FDR system consists of the following components:
• one recorder
• one FDR EVENT switch
Recorder
The recorder solid-state memory has no moving parts. This ensures maximum
reliability. Recorded data may also be retrieved (downloaded) for analysis purposes.
The FDR is automatically turned on when the right engine start switch is pushed. It
then starts to record data from the data concentrator unit (DCU). This data is fed back
to the originating DCU. If the DCU is unable to synchronize with the data returned
from the FDR for longer than 8 seconds, the FDR FAIL status message will be
displayed on the EICAS.
The FDR shuts down when power is removed from the system by pulling the FDR
circuit breaker or by shutting down the aircraft.
COMMUNICATIONS
6-26 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Flight Data Recorder System
Figure 6-15
PASS SIGNS EMER LTS
NO SMKG SEAT BELTS
ON
OFF
ARM
FDR
EVENT
ON
OFF
AUTO
ON
OFF
AUTO
O
A A
Underwater
Locating
Device
FLIGHT DATA
RECORDER UNIT
FDR Event Switch
Push to mark a specific
date/time on flight data
recordings
P604_06_015
COMMUNICATIONS
For Training Purposes Only
May 03
6-27
P I LOT T R A I N I N G GU I D E
Controls and Indicators
FDR EVENT Switch
The FDR EVENT switch is located on the PASS SIGNS/EMER LTS/FDR EVENT
panel. When pushed, the switch sends a signal to the data concentrators which place a
marker in the recorder memory to facilitate data retrieval. An event marker can be
added to the FDR any time the FDR is operating.
　
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