Northern Airborne Technology 3110 - Manual (Page 25)

SM3110 Rev. 4.00 3110-100 Audio Control Panel Manual
2.3.5
Installation Notes
2.3.5.1 Bidirectional Signals
If CAB mic select and CAB receiver volume options are installed, then CKPT INPH I/O
and SVC INPH I/O must not be tied together during installation. If CAB mic select and
CAB receiver volume options are not installed, then CKPT INPH I/O and SVC INPH I/O
may be tied together if communication between the two is desired in the installation.
2.3.5.2
Aural Warnings
The Aural Warning inputs are prioritized so that AUX1 and AUX2 have priority over
AUX3, AUX4 and AUX5 input channels. Any one of the Aural Warning signals can be
connected to AUX BACKUP.
2.3.5.3
VHF Backup
The 3110-100 provides VHF BKUP connections for one COM transceiver. In emergency
mode the pilot's headset and PTT switch will be connected to this transceiver. Any one
of the COM transceivers may be connected to the VHF BKUP connections, and the
Pilot and Copilot 3110-100 units do not have to be connected to the same backup
transceiver.
2.3.5.4 Installed Performance Test
Each Interphone I/O (CKPT INPH I/O or SVC INPH I/O) is designed to attach to a
maximum of seven 3110 ACPs, and maintain adequate signal level. TSO design
approval has been granted for interphone I/O connection to one other 3110 ACP
interphone I/O (or equivalent equipment with a 300 Ohm load impedance).
To confirm satisfactory operation when more than two 3110 ACP interphone I/Os are
connected together, an aircraft test for acceptable interphone connection must be performed.
2.3.5.5
AUX Mute
If an AUX Mute switch is installed, and Aural Warnings such as TAWS and TCAS are
routed through the 3110, an AUX Mute annunciator must be installed within the normal
field of view of both crewmembers.
2.3.5.6
Lighting
The variation of front panel and volume control lighting is approximately linear with the
voltage applied to the PANEL LIGHTING +5V input (pin 30).
The green transmit selection annunciators vary in brightness with the voltage applied to
the ANNUNC LIGHTING +28V input (pin 99) as follows:
0-7 Vdc = bright 7-18 Vdc = dim 18-32 Vdc = bright
Aug 25, 2005 Page 2-3
ENG-FORM: 805-0107.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.