Fuel quantity is indicated by an electric float fuel gauge. The electric fuel gauge
indicates the relative quantity of fuel in the tank (the corresponding quantity in
litres is shown in table 6.2).
7.10 Electrical system
The aeroplane is equipped with a 12v DC electrical system; most services use
frame return (-ve).
The engine does not require the aeroplane’s DC system to function, except for
starting. Its ignition system derives its power from an independent alternator
built into the engine. Full details of the engine’s electrical system can be found
in the Rotax Operator’s Manual.
A complete circuit diagram for the aeroplane is given in the Maintenance
Manual.
DC Supply
A 10 amp.hour lead-acid sealed battery is installed on the firewall and receives
charge from the engine’s alternator via an electronic rectifier/regulator unit and
a 25 amp fuse. The regulator is a switched mode unit and a large (22,000 μF)
electrolytic capacitor is connected across its output to provide smoothing for
avionics and other services sensitive to electrical noise. It also protects
services from over-voltage in the event of battery disconnection.
A voltmeter mounted on the instrument panel monitors the battery voltage.
Normal readings lie in the range 12 to 14.4 volts.
Distribution and Services
The battery is connected via a 25 amp fuse to a +ve busbar mounted behind the
instrument panel, and switched by the Master Switch. The busbar feeds the
following services via the fuses shown:
Oil temperature gauge
CHT gauge
1 amp
Oil pressure indicator
Tachometer
2 amp
Fuel gauge
1 amp
Voltmeter, Optional Hourmeter &
1 amp
Optional Hourmeter Warning Lamp
Starter relay
10 amp
Panel socket 1
5 amp
Panel socket 2
5 amp
Spare
5 amp
Electric Starter System
The high starter motor current is switched by a relay mounted on the firewall.
The starter relay is energised when the Master switch is ON and the starter
button, mounted on the instrument panel, is depressed.
A warning lamp in the instrument panel, is connected to the starter relay
secondary and warns if the starter relay remains closed after the starter button
is released.
Fuel Gauge
A float fuel gauge is installed in the 65 litre tank. Its sensor provides a variable
DC voltage to a meter mounted in the instrument panel. The meter shows
FULL, ¾, ½, and 0 and is calibrated when the aeroplane is built.
POH/EUR/01
Issue 2
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