Northern Airborne Technology AMU50-001 - Manual (Page 22)

AMU50-001 Audio Management Unit
SM76 Installation and Operation Manual
Section 2 Rev: 1.04
Issue 1 Page 2-10
ENG-FORM: 805-0120.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
d) Pins <43> <44> and <45> (ICS) for continuity to ground (less than 0.5 Ω) when the relevant switches
are closed.
e) Pins <47> <48> <49> and <50> (Alerts) for proper connection and operation as per the
applicable aircraft installation requirements.
Note: Alerts are configurable as either HI or LO and can be used for various supplemental
warning operations.
f) Pins <31> <14> and <15> for continuity to ground (less than 0.5 Ω) when the relevant switches are
closed.
2.4.5.2 Power On Checks
Power up the aircraft’s systems and confirm normal operation of all functions of the system. For a
Northern Airborne Technology DACS system, refer to Section 3 of this manual, and to the Operation
section of the applicable audio control panel manual for specific operational details. To verify proper
operation, all functions and levels shall be checked in-flight.
Upon satisfactory completion of all performance checks, make all required log book entries, electrical
load, weight and balance amendments and other documentation as required by your local regulatory
agency before releasing the aircraft for service.
2.5 Adjustments and Configuration
2.5.1 Maintenance Mode
The AMU50 has no external adjustments. All modifications to the configuration settings of the AMU50 are
made in maintenance mode via the USB port using a computer running the Device Configuration
Software (DevCs) application. Refer to sections 2.4.4.6.8 (Weight On Wheels Input) and 2.4.4.9 (Universal
Serial Bus) for additional information.
Connect a USB cable from the AMU50 USB port on the aircraft to the USB port on the PC running the
DevCs. Cycle the 28 Vdc power to the AMU50 to initiate a restart. The AMU50 will start up in
maintenance mode, which allows configuration settings to be adjusted when the following conditions are
satisfied:
1. The AMU50 detects a connection to its USB port.
2. Weight-on-wheels input is true (pin 31 of J103 is grounded.)
The configuration for the AMU50 can be changed as required using the DevCs. For full information,
consult the DevCs manual.
Note: When new configuration data is written to the AMU50 using the Program AMU50 function of the
DevCs, the same data should also be written to the RM01 using the Program RM01 function of
the DevCs. If the new configuration data is not written to the RM01, then the original RM01
configuration data will overwrite the new configuration data stored in the AMU50 when the
AMU50 is restarted in operational mode. This note applies only if an RM01 is installed.