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internal threshold, the RTU TEMP annunciator is displayed.
Readout
When a value is selected, it is not displayed on the RTU unless it has been accepted by
the addressed system or unit and returned to the RTU. If the echoed data does not
match the new value selected within two seconds, the displayed data is replaced by
dashes indicating that the selection has failed.
RTU TEMP Annunciation
Figure 6-12
IDENT
DME-H
1/2
BRT
BRT
108.50
ACT PRE
109.00
NAV1
ACT PRE
123.45 134.92
COM1
195.5
ADF 1 TCAS
AUTO REL
ATC
NEXT
PAGE 4567
STBY
TONE
RTU
TEMP
P604_06_012
COMMUNICATIONS
For Training Purposes Only
May 03
6-21
P I LOT T R A I N I N G GU I D E
Cockpit Voice Recorder System
Description
The cockpit voice recorder (CVR) system is a high-fidelity recorder which records the
flight crew conversations, radio communications and flight compartment sounds on
three separate channels. A fourth channel is used for synchronization with the flight
data recorder (FDR). The system operates in conjunction with the audio integrating
system. The CVR consists of the following components:
• one recorder
• one CVR control unit
• one microphone
Recorder
The recorder is designed to continuously acquire and store, in a solid-state memory,
audio data for a minimum of 30 minutes. The solid-state memory has no moving parts
to ensure maximum reliability.
COMMUNICATIONS
6-22 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
CVR System
Figure 6-13
HEADSET
COCKPIT VOICE
RECORDER
ERASE
HOLD
5 SEC
TEST
COCKPIT VOICE RECORDER PANEL
VOICE RECORDER
MICROPHONE
VOICE RECORDER UNIT
Underwater
Locating Device
P604_06_013
COMMUNICATIONS
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
　
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