COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Page 15
Nov. 01/98
Description and Operation
23–70–04
(5) Data Link
The Data Link input signals are applied to the rear connector pins 33 and 34 as a
high speed ARINC 429 signal. The Data Link output signal is sent out on pins 50
and 51 as a high speed ARINC 429 signal, along with the OMS output signal. The
Data Link Valid input signal is applied to pin 56. The Data Link Valid input signal noti-
fies the recorder to expect Data Link input signals.
When the Data Link system is energized, it sends an Aloha response message to
the recorder. If the recorder is in place and operational, the recorder records the
Aloha response message and returns a response message to inform the Data Link
system that the recorder is in place and operational. Once the Data Link system re-
ceives a response from the recorder, it will send all messages received by the Data
Link system to the recorder to be stored in the CSMU. If the recorder is not in
installed or not operational, the Data Link system will continue to send Aloha mes-
sages until the recorder’s status changes. The Data Link feature can be found on
the FA2100 CVR p/n: 2100−1025/1026/1027−( ) only. For p/n
2100−1025/1026/1027−XX CVRs, the Audio and Data Link Playback (ADPL) soft-
ware may be used to download and analyze the audio data. Refer to the
FA2100CVR Audio and Data Link Player Software Operator’s Manual, Part Number
165E3596−00.
F. Audio Monitoring
For TSO compliant FA2100CVRs mounted in the aircraft, previously recorded data
cannot be monitored from the FA2100CVR. This is a security feature implemented
to protect the rights of pilots and other flight crew members.
The Cockpit Area Microphone (CAM), pilot, co-pilot, and spare audio can be moni-
tored during recording using a headset plugged into the 1/4-inch, 600-ohm phone
jack mounted on the front panel of the associated control unit. For the model
2100−1025/1026/1027−( ), the phone jack is a 600−ohm, boomset jack. Also, when
being tested at the standard test bench set up, all recorder audio inputs can be mon-
itored using the speaker mounted within the Cockpit Voice Recorder System Test
Panel, p/n 9300A860. Refer to Figure 5 for the block diagram of audio montoring
circuit.
May 21/1
Rev. 11 Page 15
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