ACCESS/A A711 L-Series Installation Manual 09RE416
Technisonic Industries Ltd. Copyright 1996, 1997, 2010, 2011 BY TiL ALL RIGHTS RESERVED Page 1-6
1.6.4
Isolation Limitations
When in Pilot Isolation Mode, the pilot microphone for ICS operation is rendered inactive. Consequently,
neither co-pilot nor passengers can receive pilot intercom transmissions while the latter is in Isolation
mode.
1.6.5 Standard Settings Utilised Throughout Testing
Pilot Headset Settings utilized throughout testing was for the standard 150 ohms impedance headset. The
PAL options utilized were applicable to the following configuration: Where Pilot or Co-pilot transmitted on
the UUT ICS communication was possible only in the instance where the signal emanated from other
unit(s) daisy chained to the UUT via the ICS tie-line. In this event the UUT would receive the ICS
transmissions from the other unit(s). It was not possible for the UUT, which transmitted, to export ICS
communication to another unit nor was it possible for intra ICS communication to occur between users
connected to UUT (i.e. Option 1 not implemented).
1.6.6 Transmission Priority
Where Pilot and Co-pilot transmit simultaneously, the Pilot transmissions take precedence over those of
the Co-pilot. Co-pilot transmissions in this case would be rendered inactive.
1.6.7 Induced Signal Susceptibility, RF Susceptibility and RF Emission
The wiring connections called out in the Installation and Operating Instructions, chapter 2, describes shield
terminations for minimum ground loop noise. The test harnesses used for RTCA/DO-160 sections 19, 20,
and 21 – Induced Signal Susceptibility, RF Susceptibility, and Emission of RF Energy respectively - used
shield terminations at both ends of the cable. Should RF susceptibility pose a problem in a particular
installation the installer may wish to try terminating shields at both ends of the cable, further, if this does
not produce satisfactory results then double shielding may be required.
