COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Rev. 15 Page 60
Apr. 14/16
Description and Operation
23–70–04
Use or disclosure of information on this sheet is subject
to the restrictions on the cover page of this document.
moved from an aircraft with RIPS and re
−
installed on an aircraft without RIPS, it
is possible that previous flight leg RIPS fault information, stored in the CVR
fault log while installed on the aircraft with RIPS, will be displayed. This is not
considered a likely event since when a CVR is removed from an aircraft it is re-
quired to pass a ”return to service” test performed on a repair bench, before re
−
installation. This procedure usually includes clearing the fault log that may
have had RIPS faults recorded.
This RIPS Present status will be received and transmitted in the Label 350, La-
bel 351, and new Label 352 outputs as follows:
RIPS Presence
Status
CVR Discrete in-
put (Pin 42)
SSCVR Label 350
and 352 (Bit 22)
SSCVR Label 351
(Bit 20)
Not present
Open
0
1
Present
Ground
1
0
For more information on the RIPS, see P/N:165E4900
−
00,
Installation and
Operation Instruction Manual for Recorder Independent Power Supply (RIPS).
9.
On board Maintenance System Interface
The 2100
−
1025
−
22/
−
24 CVR includes an ARINC 429, high speed, On board Main-
tenance System (OMS) output interface (Pins 50/51) and an ARINC 429, low speed,
OMS input interface (Pins 39/40). The OMS input interface is only used for OMS
heartbeat detection and is discussed further in section 1.4 below.
The OMS output interface is used for transmission of CVR status information to a
Centralized Maintenance Computer (CMC). The OMS outputs are listed in Table
1.1.
Table 11. CVR OMS Output Words
Label
Parameter
Format
Rate
350
CVR Status Word
BNR
1 s
354
LRU identification (P/N and S/N)
ISO 5
0.5 s
377
ARINC 429 equipment identification
BCD
1 s
The Label 350 status word can be used to supplement or replace the discrete status
outputs that are otherwise available from the CVR (e.g. CVR Fault discrete, DataLink
Fault Discrete, and Test Good Indicator). The CVR software provides the Label 350
status output word, per ARINC 757A, once per second.
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