Model FA2100CVR
Instruction Manual
Installation & Operation
Page 7
Rev. 16
165E1846-00
Table 4
.
CVR LABEL 350 OUTPUT FORMAT (CONTINUED)
3031
SSM 350
31 30
1 1 Normal Operation (NO)
1 0 Functional Test (FT)
0 1 Non Computed Data (Not Used)
0 0 Fault Warning (Not Used)
32
Parity
In general, the Label 350 Status Word bits operate as outlined in ARINC 757
−
4, Attachment 20. There is
some interaction among the status bits in Label 350 with regard to Bit 11 (CVR Status), the CVR Fault
Status discrete output, and with the results of the CVR Push
−
to
−
Test function. These interactions are
summarized in Table 5 below:
The RIPS Status reporting is unique for the P/N: 2100
−
1025
−
24.
RIPS Maintenance Status (Battery)
is
indicated in bit 26 and
RIPS Fault Status
is indicated in bit 27. The CVR provides this data as received
from the RIPS in near real time over this OMS link. Upon power interruption or loss to the RIPS/CVR
system, the CVR would ensure that the RIPS supplies the CVR with the required backup power. Spe-
cifically, if the system was powered for at least 10 minutes but less than 15 minutes, a hold up time of at
least 5 minutes would be expected, and if powered for 15 minutes or more, a hold up time of at least 9
minutes would be expected.
If the RIPS meets this requirement, which ensures it is operating in accordance with its intended func-
tion, on the next power up the OMS discrete bits would indicate a no Maintenance and a no Fault condi-
tion regardless of the information the RIPS provides to the CVR. This no Maintenance and no Fault re-
porting would also occur if the previous recorder power cycle was less than 10 minutes in duration. In the
event the RIPS does not provide for its intended function on the previous power cycle, as described
above, the CVR would report actual real time status of the Maintenance and Fault signals it receives from
the RIPS in bits 20 and 15. Reporting of RIPS Present would always provide real time status on bit 22
and RIPS Active would always provide real time status on bit 21. To provide for comprehensive
troubleshooting, real time status of RIPS Maintenance and Fault will be provided on OMS label 350 bits
26 and 27 respectively.
In all scenarios, the status of the RIPS as reported to the recorder will be recorded in the Cockpit Voice
Recorder fault log.
Table 5. CVR FAULT REPORTING INTERACTIONS
L350
BIT
N°
FUNCTION
REPORTED
WITH L350
BIT 11
REPORTED
WITH PUSH
TO TEST
REPORTED
WITH CVR
FAULT DIS
CRETE
11
CVR Status (Audio Recording Fail
ure)
YES
YES
YES
12
CMC Bus Status (OMS Input)
NO
NO
NO
13
CVR Control Unit Failure
YES
YES
YES
14
FDR Status (not used)
NO
NO
NO
15**
RIPS Fault Status (Pin 29)
NO
NO
NO
