COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 43
July 21/17
Description and Operation
23–70
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30
Use or disclosure of information on this sheet is subject to
the restrictions on the cover page of this document.
already provided at A/C level (interlock devices monitored with the aircraft on
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ground information and effective park brake locked), the CVR provides a timed inter-
lock for erase. The erase starts by connecting CVR pin 55 to pin 57 for a minimum of
2 seconds and then connecting pin 55 to ground (pin17) before erasing the previ-
ously recorded data. This action is initiated by pressing the Bulk Erase push
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button
on the applicable Control Unit.
The erase is indicated by a 400Hz tone activated during the erase process on Con-
trol Unit Headphone or Boomset to validate bulk erasure. The erasure is activated
once per depression (no cycling).
As per ED112 IV
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2.2.3 (Data Link part), recorded digital messages shall not be
erased, re
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written or altered during the process of downloading. In addition, also per
ED112 IV
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2.1.12 (Data Link part), no means for the erasure of the record shall be
provided in the recorder, except for the overwriting of the oldest data by new infor-
mation.
F.
Recorder Synchronization
The FA5000CVR equipment is designed to be able to record time code from an AR-
INC 429 in priority and later FSK source (the frequencies used are /
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30Hz
and /
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30Hz), depending on the source used on the aircraft. For Models
FA5000CVR the recorder automatically detects which source is received, acquires
the time data, and stores it into memory.
The A429 clock refresh time is to one (1) second; if after this time, the CVR is capa-
ble of acquiring and to recording the FSK Frequency necessary for synchronization.
The ARINC GMT word (either label 125 UTC BCD or 150 UTC BNR) is transmitted
at a rate of one (1) second, the FA5000CVR recorder is designed to recognize and
record GMT word sent at this transmit rate.
The CVR is capable of recording both label 150 or 125 with a priority for Label 150 if
both labels are present.
The CVR equipment contains an internal time reference in the event FSK or ARINC
429 time reference is not available.
Label 350, Bit 17 indicates the status of the clock as the following: 0=ok and 1=fail-
ure.
G. Data Downloading
It is possible to download the Data Link message data from the crash protected
medium, while the recorder is installed on the aircraft (as per ED112 Part IV §
IV
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2.2.3).
The document reference is online, please check the correspondence between the online documentation and the printed version.