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receives data from data concentrator unit No.1 (DCU 1), records the information and sends it
back to the DCU1 for comparison. If DCU 1 fails, DCU 2 will supply the data to the FDR.
The FDR will operate when the STROBE lights switch or BEACON lights switch is selected
on, or if the aircraft is in a weight off wheels condition. The FDR has an internal clock which
is used as the time reference from which events are recorded. An event can be marked by
the pilot by operation of a FDR EVENT button on the Miscellaneous Test panel.
A cockpit voice recorder (CVR) starts recording as soon as power is applied to the aircraft. It
has a solid state non-volatile memory that records cockpit and mixed PA audio. The unit has
a recording capacity of 30 minutes (120 minutes, depending on option). The deceleration of
impact removes the power to prevent the data from being erased.
The FDR and CVR each includes an underwater locater device (ULD). The ULD is a battery
operated, underwater, pulsed acoustic beacon which has an internal switch that is activated
by water. When activated, the unit sends out a 36.5 to 38.5 kilohertz signal.
REV 56, Jan 31/03
AURAL/VISUAL INDICATING AND Vol. 1 02--30--2
RECORDING
Recording
Flight Crew Operating Manual MASTER
CSP A--013
Recording <MST>
Figure 02---30---1
Cockpit Voice Recorder Panel
Pilot’s Instrument panel
HEADSET
Used to connect
headset to monitor
recording tone
during test.
ERASE
Used to erase
previous recording,
while on ground.
Cockpit Voice Recorder Panel
Pilot’s Instrument panel
TEST
Used to
test CVR.
HEADSET
Used to connect
headset to monitor
recording tone
during test.
ERASE
Used to erase
previous recording,
while on ground.
FDR EVENT
Pushing and holding for
a period of 2 seconds
records a time stamp on
the FDR.
Miscellaneous Test Panel
Center Pedestal
<0065>
TEST
Used to test CVR.
Hold for 5 seconds.
Test light illuminates
to indicate successful
test.
Vol. 1 02--30--3
REV 56, Jan 31/03
AURAL/VISUAL INDICATING AND
RECORDING
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Flight Crew Operating Manual
CSP A--013
MASTER
Recording --- EICAS Indications <MST>
Figure 02---30---2
FDR FAIL status (white)
Indicates a difference
between the recorded data
and the data supplied by
the DCU.
FDR ACCEL FAIL status (white)
Indicates a FDR accelerometer
out of tolerance on the ground
with the parking brake set and
DC bus 1 on (stays latched
until FDR event button pressed
for 2 seconds).
FDR EVENT advisory (green)
Indicates that a FDR EVENT
was selected.
Status Page
<0039>
<0039>
REV 56, Jan 31/03
AURAL/VISUAL INDICATING AND Vol. 1 02--30--4
RECORDING
Recording
Flight Crew Operating Manual MASTER
CSP A--013
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Flight Data
FLIGHT REC
PWR AC BUS 1
1
C9
Recording
Recorder FLIGHT REC
CONT DC BUS 1
K2
Cockpit Voice CKPT VOICE
DC
4 D7
Recorder
REC
ESSENTIAL
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Maintenance Data Computer
Flight Crew Operating Manual
CSP A--013
MASTER
1. MAINTENANCE DIAGNOSTIC SYSTEM
The maintenance diagnostic system is used by maintenance personnel to view current and
historical information relating to specific aircraft systems health and operation.
The system uses a maintenance diagnostic computer (MDC) to process and record avionics
and aircraft systems data for future retrieval. A maintenance switch, located behind the
pilot’s seat, is used to enter the maintenance diagnostics mode. The multifunctional displays
(MFD’s) are used to display the maintenance data and the EICAS control panel is used to
control and select information on the MFD display. Status and function information for all
aircraft Line Replaceable Units (LRU’s) is displayed in coded words using different
numbering systems (binary, octal and hexadecimal). Maintenance personnel use a data
dictionary to decode the displayed information.
A data loader unit is used to upload or download data to or from a floppy disk.
When the maintenance switch is set to MFD1 or MFD2, the applicable MFD is configured to
display maintenance related display pages and the respective Display Control Panel (DCP)
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