Northern Airborne Technology AMU50-001 - Manual (Page 15)

AMU50-001 Audio Management Unit
SM76 Installation and Operation Manual
Section 2 Rev: 1.04
Issue 1 Page 2-3
ENG-FORM: 805-0120.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
CAUTION:
DACS LRU Replacement
If a replacement RM01 is being installed, it is important to be aware that the
configuration data from the existing AMU50 will be overwritten by factory
default data stored in the RM01. Similarly, if a replacement AMU50 is being
installed, the configuration data in the AMU50 will be overwritten by the data
stored in the existing RM01 (if installed).
Refer to the Northern Airborne Technology DevCs Installation and Operation
manual for information on re-entering configuration data for a DACS AMU50
Audio Management Unit.
CAUTION:
The AMU50 will start up in Maintenance Mode if the Weight On Wheels input
is grounded and the USB port is active when power is applied to the unit.
2.4.3 Mounting
The AMU50 can be bulkhead mounted in any orientation using four 10-32 screws. No shock or vibration
isolators are required.
The AMU50 must be mounted to a clean metal surface which is electrically bonded to the aircraft ground
plane. The unit is finished with a coating which prevents corrosion. This film is electrically conductive and
should not be removed for electrical bonding.
2.4.4 Cabling and Wiring
All wire shall be selected in accordance with the original aircraft manufacturer's Maintenance Instructions
or AC43.13-1B Change 1, Paragraphs 11-76 through 11-78. Unshielded wire types shall qualify to
MIL-W-22759 as specified in AC43.13-1B Change 1, Paragraphs 11-85, 11-86, and listed in Table 11-11.
For shielded wire applications, use Tefzel MIL-C-27500 shielded wire with solder sleeves (for shield
terminations) to make the most compact and easily terminated interconnect. Follow the connector map in
Section 2.7 as required.
Allow 3" from the end of the shielded wiring to the shield termination to allow the connector hood to be
easily installed. Reference the interconnect drawing in Section 2.7 for shield termination details. Note that
the hood is a "clamshell" hood, and is installed after the wiring is complete.
Maintain wire segregation and route wiring in accordance with the original aircraft manufacturers
Maintenance Instructions.
Unless otherwise noted, all wiring shall be a minimum of 22 AWG, except power, headphones, mic and
ACP power lines, which shall be a minimum of 20 AWG. Reference the Interconnect drawing for
additional specifications. Check that the ground connection is clean and well secured, and that it shares
no path with any electrically noisy aircraft accessories such as blowers, turn and bank instruments or
similar loads. Power to this unit must be supplied from a separate circuit breaker or fuse (fast blow), and
not attached to any other circuit breaker without additional protection. Verify that the selected circuit
breaker size and wire gauge are adequate for the installation using the techniques specified in
AC43.13-1B Change 1, Paragraphs 11-47 through 11-51 and 11-66 through 11-69.