TY91/TY92 VHF Radio Installation Manual 24 November 2014
00839-00 Issue AF
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Trig Avionics Limited 31
An alternative to a harness built from individual wires, particularly for a long
cable run, is to use a multi-core cable. Aviation grade cable with 6 or more
cores is often more expensive than the individual wires, and therefore is not
generally a good choice for a certified aircraft. For aircraft where those
considerations do not apply however, an attractive alternative solution may be
to use 3 pair or 4 pair data cable.
Whilst appropriate cables may exist, please note that not all data cable is
suitable for this application. Cables with solid cores should not be used, and
cables should be selected based on the wear characteristics of their insulation
material, including temperature rating, resistance to solvents and oils, and
flammability. Most inexpensive commercial data cables have poor
flammability properties.
Note: If you are installing more than one Trig TY91/TY92 radio, or
installing a radio with a Trig TT21/TT22 transponder, then bundling
the TC90 and TC20 control head interconnecting wires into one loom
is acceptable and will not cause any interference between the two
units. The same is not true of the audio wiring or antenna wiring –
these should be kept apart using normal wiring practices.
5.10.2 Dual TC90 Interconnect
The wiring considerations detail in 5.10.1 should be followed when wiring
both controllers. Cable lengths and routing will vary depending on the physical
placement of the two TC90 controllers and the TY91/92 VHF radio and you
should take this into account when choosing the wire type and size.
On some of the TY91/TY92 connections there is only provision of one output
to feed both TC90 controllers. For these connections, you will need to join or
splice wires together. It is advisable to join the wires at either the TY91/TY92
radio connector or the TC90 connector depending on the physical placement of
the units.
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