L3 FA5000, Maintenance Manual

Page: 122 / 209

COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 124
July 21/17
Testing & Fault Isolation
23–70 − 30
Use or disclosure of information on this sheet is subject to
the restrictions on the cover page of this document.
(10) Crosstalk Audio
Record simulated 1000 Hz data for each channel 1,2,3 & 4 and calculate difference
between driven and non
− driven channels. Verify difference is less than − 40 dB.
Example report message(s):
08:41:34 PASSED Crosstalk (Audio) 1000 Hz 1.0 ref (Expected Driven − Non −
Driven < − 40 dB) Results = HQ1 11.2 /HQ2 − 101.0 /HQ3 − 109.9 /HQC − 128.1
/SQV 11.4 /SQC − 84.4 dBV
08:41:49 PASSED Crosstalk (Audio) 1000 Hz 1.0 ref (Expected Driven − Non −
Driven < − 40 dB) Results = HQ1 − 101.3 /HQ2 11.2 /HQ3 − 115.3 /HQC − 107.5
/SQV 11.4 /SQC − 72.3 dBV
08:42:04 PASSED Crosstalk (Audio) 1000 Hz 1.0 ref (Expected Driven − Non −
Driven < − 40 dB) Results = HQ1 − 304.8 /HQ2 − 127.4 /HQ3 11.1 /HQC − 104.4
/SQV 11.4 /SQC − 72.0 dBV
08:42:19 PASSED Crosstalk (Audio) 1000 Hz 1.0 ref (Expected Driven − Non −
Driven < − 40 dB) Results = HQ1 − 304.9 /HQ2 − 304.9 /HQ3 − 111.7 /HQC 11.1
/SQV − 72.4 /SQC 11.4 dBV
(11) Crosstalk Data
This is a test for CVDR recorders where both flight data and voice data are being
recorded.
A Channel Balance is performed prior to the cross talk data test to determine and
store results for each channel 1,2,3 and 4.
Record 6000 Hz simulated rotor data and simulated GMT 429 and calculate chan-
nel results minus channel balance results. Verify difference is less than
− 34 dB
Example report message(s):
08:43:07 PASSED Channel Bal 1000 Hz 1.0 ref (All within 3 dB) Results = HQ1
11.2 /HQ2 11.2 /HQ3 11.0 /HQC 11.1 /SQV1 11.0 /SQV2 11.3 /SQV3 11.4
/SQC 11.5 dBV
08:43:23 PASSED Crosstalk (Data) 6000 Hz 1.0 ref (Expected Crosstalk −
Channel Bal < − 34 dB) Results = HQ1 − 304.9 /HQ2 − 125.7 /HQ3 − 304.8 /HQC
− 49.8 /SQV − 83.4 /SQC − 82.8 dB
The document reference is online, please check the correspondence between the online documentation and the printed version.