FSG 90 System
3 Installation
22 FAV_D10024 December 2014
3.6 Airborne wiring
Refer to Figures 3-5 to 3-7 of on-board wiring.
3.6.1 General recommendations
Always ensure continuously good, stable electrical contacts, and efficient RF
interference suppression of all electrical systems like generator/alternator, ignition
etc., especially consider vibration and corrosion effects. Consult the aircraft
installation licensing inspector.
Do not allow the harness to droop between clamps, especially if it is a heavy harness.
Do not allow the wires in the harness to be exposed to sharp surfaces or ride against
any movable surface.
Do not install without allowing for service loops, this will help to prevent undue stress
on the connectors and allow for easier repair of wire terminations.
Do not allow harness to route through high heat areas without adequate thermo
protection.
Do not install harnesses in areas that are subject to chemical damage.
Radio wiring shall be located most distant to other, high AC currents carrying leads.
Route all wiring including antenna cable distant from aircraft control and handling
components. Place DC power lines at least 15 cm away from compass.
Use only aviation grade wiring material (LN 9251 resp. LN 9253) in self-extinguishing
quality, and with > 500 Volt isolation.
Prescribed cable diameters must be complied with.
Ground loops must be avoided.
Cables are soldered to the DA-25S connector. Solder joints shall be supported by
shrinking or rubber sleeves. Cable connector case mounting shall not clamp or
damage the wiring.
The FSG 90(X) is protected against reversed polarity only when using a suitable DC
supply protection fuse. For 6 Watt models, we suggest a 3.15 Amp quick acting fuse,
or an automatic 3 Amp circuit breaker. For 10 W models (suffix "-H1"), we suggest a 5
Amp quick acting fuse, or an automatic 5 Amp circuit breaker. Without proper fuse
protection, the radio unit may become severely damaged, warranty validity
terminates.
Power bus circuit breakers are to be mounted in the A/C breaker panel or instrument
panel such that they will be accessible in flight and safe from physical damage.
Before first connection to the FSG 90(X) radio is made, carefully cross-check all
wiring details, especially DC supply polarity.
Secure the connected accessory plug by the sliding lock to avoid unwanted connector
loosening.
For ease of installation, prefabricated wiring harnesses for all kind of aircraft are
available from FSG 90(X) radio manufacturer.
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