Northern Airborne Technology ACP53-001 - Manual (Page 11)

ACP53-001 DACS Audio Control Panel
SM75 Installation and Operation Manual
Section 2 Rev: 1.01 Issue 1 Page 2-3
2.4.5 Legend Installation
Note: The legends for RX and TX channel labelling must be consistent on each ACP5x within a
communications management system (i.e. on each aircraft.)
Each ACP53 requires a set of legends, either purchased individually (Part no. 55-06-xxxx) or as a legend
kit (Part no. ACPLK-xxx). Each kit consists of a number of printed legends and blanks (to suit customer
requirements), and each legend comes complete with a black gasket, either attached or loose in the bag.
For additional information, see section 2.6.2.
Legend Gasket
When installing the legends for the first time, each legend must be fitted
with a black gasket to ensure uniformity of legend lighting. The gasket
fits into place on the back of the legend, but is easily dislodged or
damaged. Take particular care to ensure that it is properly positioned
before snapping the legend fully into place. If a replacement gasket is
required, the whole legend must be ordered.
If it is necessary to remove or replace a legend, carefully lever the legend away from the faceplate, and
insert the new or replacement legend as described above.
CAUTION:
If the faceplate is damaged in any way during this process, light leakage may
occur, which will necessitate returning the unit to the manufacturer for repair
or replacement.
2.4.6 Custom Designation Cross-Reference List
A Custom Designation Cross-Reference List is included in Section 2.7. When installed as part of a
Northern Airborne Technology Ltd DACS, this form is used to cross-reference the signal designations
from the AMU50.
2.4.7 Post Installation Checks
2.4.7.1 Voltage/Resistance Checks
Do not attach the ACP53 until the following conditions are met.
Check the following:
a) Check pin <2> for +28 Vdc OR pin <3> for +5 Vdc relative to ground (selected lights voltage).
b) Check pins <9> and <10> for ground (less than 0.5 Ω).
c) Check pin <11>
for lights ground (less than 0.5 Ω).
d) Check pins <6> <7> and <8> for ground (less than 0.5 Ω) when the appropriate switches are closed.
ENG-FORM: 805-0117.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.