COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Rev. 15 Page 62
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.
19
CVR Recording Failure (Record Enable)
0: OK 1 : Failure
20
RIPS Maintenance Status (Battery) (pin 38)
0: No Maint. 1 : Maint. Req.
21
RIPS Active Status (pin 10)
0: Not Active 1 : RIPS Active
22
RIPS Presence Status (Pin 42)
0: Not Pres. 1 : RIPS Present
2329
Spare
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, At-
tachment 20. There is some interaction among the status bits in Label 350 with re-
gard to Bit 11 (CVR Status), the CVR Fault Status discrete output, and with the res-
ults of the CVR Push
−
to
−
Test function. These interactions are summarized in Table
1.4 below:
Table 14. 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
Failure)
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
16
CVR DataLink Recording Failure
NO
NO
NO
17
Clock Status
NO
NO
NO
18
Data Link Input Interface
NO
NO
NO
19
CVR Record Enable (Pins 7/8)
NO
YES
YES
20
RIPS Maintenance Status (Bat-
tery) (Pin 38)
NO
NO
NO
21
RIPS Active Status (Pin 10)
NO
NO
NO
22
RIPS Presence Status (Pin 42)
NO
NO
NO
It is important to note that certain CVR faults can only be detected through the
“Push
−
to
−
Test” function. This commanded BITE provides the only test of the CVR
audio input circuits. During the Push
−
to
−
Test operation, the CVR generates a test
tone and sequentially injects it into each of the four audio input channels. A CVR
fault will be asserted if the tone amplitude or frequency is not correctly detected.
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