SA 160
AIRCRAFTA I R C R A F T
Symphony
AIRCRAFT
7.33 ELECTRICAL SYSTEM
TheSA160isequippedwitha28-volt,DCelectricalsystem.
It is powered by a belt driven alternator and a 24V battery, located in the
aftfuselagebehindthebaggagecompartment.
An external power source can be connected. The external power
receptacleislocatedontheaftwallofthebaggagecompartment.
All electrical systems components are protected by circuit breakers. The
circuit breaker panel is located on the extreme right side of the
instrument panel.
The electric power distribution to the various accessories has been
designedforfunctionalityandsafety(SeeFig.7-14).
The alternator output is connected to the main bus through a 50-amp
circuit breaker. The battery bus is connected to the battery or the external
power source. The main and battery bus are interconnected by a 50-amp
circuit breaker. The avionic bus 1 is powered through the battery bus and
theavionicbus2throughthemainbus.
(a) ALT/BAT Switch
The switch ALT / BAT, also named master switch, is a split rocker type
switch. The master switch is located on the instrument panel on the
extreme left of the row of switches. The master switch is colored red.
Through the right half of the switch, labeled BAT, the battery and
main bus bars are supplied with power. All electrical devices
connectedtothemainbuscanthenbeactivated.
If an external power source is connected to the aircraft, the electrical
powertothemainbusisstilldonethroughtheBATswitch.
The left section of the master switch, the alternator ALT switch
controls the alternator. During start up the alternator is put into
standby and when the engine is running the alternator powers all the
electricaldevicesconnectedtothemainandbatterybusbars.
Normally, both sides of the ALT / BAT switch should be used
SECTION 7
DESCR. & OPERATION
7-39
Feb 25, 2005
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