Technical data

VHF/AM RADIO FSG 2T
3 Installation
June 2014 FAV_D10048 27
3.5 Airborne wiring
Refer to Figures 3 - 4 to 3 - 8 of on-board wiring.
3.5.1 General recommendations
 Always ensure permanent good, stable electrical contacts, and efficient RF inter-
ference suppression of all electrical systems like generator / alternator, ignition, elec-
tronic variometer, anti-collision light, etc., especially consider vibration and corrosion
effects. Consult the Aircraft Installation Licensing Inspector.
 Connect the positive (+12 Vdc) power wire (normally red) to pins 9 and 10. Because
of current requirements it is essential that the connection is made to both pins, other-
wise problems may arise. The positive wire must be connected to the aircraft power
via a circuit breaker (inline fuse 3.15 amps or automatic circuit breaker 3 amp) and
through a radio master switch, not direct to the battery. Do not connect to power until
installation is complete and cross-checked.
 Connect the negative (-12 Vdc) ground wire (normally blue or black) to pins 11 and
12. Because of current requirements it is essential that the connection is made to
both pins, otherwise problems may arise. The ground wire must be connected to a
good clean contact that provides a durable path to the aircraft ground. Prefer a
ground wire direct to the battery's negative terminal.
 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.
 Do not allow the harness to droop between clamps.
 Do not allow the wires in the harness to come in contact with sharp surfaces or ride
against any movable part.
 Do not install without allowing for service loops / strain relief, 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 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 (6 inches) 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. Route shielding of dynamic mike(s) separate from
other grounds or shields.
 Cables are soldered to the Standard DB-15 female connector. Solder joints shall be
supported by shrinking or rubber sleeves. Connector back shell must not clamp or
damage the cables.
 Secure the radio connector by the sliding lock to avoid unwanted connector
loosening.