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allowing the recording of 57 parameters, in compliance with FAR Part 135.
C. Underwater Locating Beacon:
An underwater locating beacon (Figure 3) is attached to the flight data
recorder. When activated by contact with water, it transmits a traceable
acoustic signal to aid in underwater location of the airplane and/or flight
data recorder. The underwater locating beacon receives power from a selfcontained
battery.
D. Flight Data Recorder Impact Switch:
The flight data recorder impact switch (Figure 4) removes power from the
flight data recorder upon impact. Removing power prevents pertinent data
from being erased from the flight data recorder. The impact switch is
mounted in the tail compartment’s right side, just outboard of the flight data
recorder. Activation of the impact switch also causes an annunciator light
on the switch housing to illuminate, remaining illuminated until the impact
switch is reset. Resetting the impact switch is accomplished through the
use of a reset switch, also located on the impact switch housing.
E. Flight Data Recorder Maintenance Ground Override Switch:
The flight data recorder maintenance ground override switch (Figure 5) is
located in the top of the right hand radio rack and is labeled FDR MAINT
GRD OVRD.
During normal operations, the flight data recorder begins recording during
engine start when sensed oil pressure rises to 10 psi or greater on either
engine. Thus, there exists the possibility that recorded data could be
overwritten during extended ground engine runs. If the aircraft is stationary
and the Weight-On-Wheels (WOW) system is in the GROUND mode,
placing the FDR MAINT GRD OVRD switch in the OFF position allows
maintenance personnel to inhibit flight data recording while aircraft engines
are operating.
If the switch is inadvertently left in the OFF position, transfer of WOW to the
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PRODUCTION AIRCRAFT SYSTEMS 2A-31-00
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January 31/02
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AIR mode (such as during takeoff) automatically returns the switch to the
AUTO position, enabling flight data recording. Manual positioning of the
switch to the AUTO position is also possible.
F. Flight Data Entry Panel:
The flight data entry panel (Figure 6) is located in the copilot’s side
console. It is used by the flight crew to enter a four digit flight number or leg
number by positioning its four FLIGHT NO. thumbwheels. Marking of
events in the recorder’s memory is conducted using the EVENT switch.
Faults related to the flight data recorder and flight data acquisition unit are
annunciated by the amber DFDR and FDAU lights, respectively.
G. Flight Data Recorder Switch Panel:
The flight data recorder switch panel (Figure 7) is located adjacent to the
flight data entry panel. The panel has a FDR MANUAL ON/OFF toggle
switch and a blue indicator light.
The FDR MANUAL switch is normally left in the OFF position. Selection to
ON hard-selects the flight data recorder to ON, permitting recording prior to
engine start-up (i.e., prior to acquiring engine oil pressure). Selection to ON
will also return the radio rack FDR MAINT GND OVRD switch to AUTO, if
the OVRD switch was selected to OFF. The FDR MANUAL switch is
normally selected to OFF after engine start but, if left ON, will recycle
automatically to OFF after the airplane has landed to prevent being
inadvertently left ON. Whenever the FDR MANUAL switch is ON, the blue
indicator light is illuminated.
3. Controls and Indications:
(See Figure 2 through Figure 7.)
A. Circuit Breakers (CBs):
Circuit Breaker Name: CB Panel: Location: Power Source:
FDR/FDAU CP C-7 ESS AC Bus
FDR CONT #1 CP C-8 ESS DC Bus
FDR CONT #2 CP C-9 BATT #1 Bus
POSN SNSRS CP C-10 #1 26 VAC XFMR Bus
B. Advisory (Blue) CAS Messages:
CAS Message: Cause or Meaning:
FLIGHT REC FAIL Flight data recorder has failed. It is normal for this
message to be displayed until after an engine is started
and 10 psi oil pressure is obtained.
C. Other Advisory Annunciations:
Annunciation: Cause or Meaning:
ON annunciator illuminated adjacent to
FDR MANUAL switch (copilot’s side
console).
FDR MANUAL switch is ON.
Flight data recorder impact switch
annunciator light illuminated.
Flight data recorder impact switch has
been activated.
FDAU annunciator illuminated on flight
data entry panel.
Flight data acquisition unit fault or failure
detected.
OPERATING MANUAL
2A-31-00 PRODUCTION AIRCRAFT SYSTEMS
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January 31/02
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Annunciation: Cause or Meaning:
DFDR annunciator illuminated on flight
　
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