Revision G
October 14, 1996 11
3.3 GENERAL INSTALLATION INSTRUCTIONS FOR AVIONICS (Continued)
Remove the connector plates from the rear of the trays. Connect all wires to the
proper pin of each connector, checking as you go to insure that no loose strands
cause shorting to adjacent pins or to ground surfaces. Be particularly careful with the
shield braids of shielded wires. We recommend tubing be placed over each soldered
pin connection to prevent wire strands from touching adjacent connections. Do not
expose any more of the conductor than is absolutely necessary and keep the braid
connection as short as possible. Remember that on shielded wires only one ground
point is recommended. Follow manufacturer’s recommendation about where the
ground point should be located.
After completing all connections, check wiring
with an ohmmeter again to ascertain that all connections are as desired and that
no undesired shorting to ground or other pins has occurred. Visually double
check to see that braids on shields are not creating shorting, that no insulator melting
has occurred during soldering and pull firmly on all connections to insure good
mechanical bond.
Install the harness and connectors/connector plates in the aircraft with very
loose
dress only.
Solder all connections to power and ground and install panel components/controls
and safety devices (eg. fuses or breakers). It is desirable at this point to insert all
equipment in trays and perform preliminary check-out. Following a satisfactory
check-out, and with all equipment in the properly installed location, complete the
final dressing and routing of the harness and secure in place.
Note:
It is extremely important that units should be installed in trays while final
dress and bundling of the harness is accomplished to assure proper alignment
of connectors between tray and unit. Failure to do this may cause problems
when unit is initially inserted into tray due to misalignment of connectors!
The final step is to perform a complete check of all avionics operations and insure
that free movement of all cockpit controls is available.
3.3.4 NOISE AND INTERFERENCE
The typical airframe is a small and imperfect platform for providing all of the
antenna ground planes and power sources and inter-wiring required for avionics
operations, particularly for a low noise and interference free expectation. This
subject is far too broad and complex to address in detail in a few paragraphs.
However, an approach to categorizing and defining the problem can be outlined.
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