COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 48
July 21/17
Description and Operation
23–70−30
Use or disclosure of information on this sheet is subject to
the restrictions on the cover page of this document.
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 re-
sults of the CVR Push−to−Test function. These interactions are summarized in Ta-
ble 1.4 below:
Table 7. 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.
Like any other internal CVR fault, this audio circuit failure will be reported using: the
Label 350 output Bit 11, the CVR Fault Status discrete output, and the Push−to−Test
The document reference is online, please check the correspondence between the online documentation and the printed version.
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