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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.
EICAS Messages
MESSAGE MEANING AURAL WARNING
(IF ANY)
FDR EVENT Confirm the flight data recorder has set a marker in response
to activation of the button on the control panel.
SELCAL HF 1/2
A call for this aircraft has been detected on the respective
high-frequency radio. Message will be canceled when that
radio is keyed to reply.
“SELCAL”
FDR FAIL Indicates the flight data recorder is inoperative.
EICAS Messages
Table 6-1
COMMUNICATIONS
6-28 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Static Dischargers
Description
The aircraft is equipped with a system of wicks on the aft-facing surfaces and
horizontal stabilizer tips. Each wick consists of a base and a discharger. The 24 (26 as
per SB 604-23-006) dischargers allow gradual bleed-off of static electrical charges
from the airframe to prevent radio interference.
Static Dischargers Location
Figure 6-16
P604_06_016

　
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