Power Distribution; Battery And External Power; Battery Servicing - THRUSH S2R – G10 Maintenance Manual

AIRCRAFT MAINTENANCE MANUAL
GENERAL DESCRIPTION
The aircraft 24-volt DC electrical system
is designed to provide the utmost in
reliability. Two 24-volt storage batteries
provide electric current
starting and a reserve source of electrical
power in the event of generator failure. A
D.C. power receptacle provides a means
for connecting external power to the
aircraft electrical system. To conserve
battery life, external power should always
be used for starting engines when
temperature is below 40F or when
performing maintenance
electrical power. A generator installed on
the engine supplies the primary source of
electrical power to the main bus.
voltage regulator protects the electrical
system, reverse current relay and circuit
breakers. If generator output voltage is
below bus voltage, the battery supplies
the busloads. The D.C. ammeter,
installed in the
indicates the discharge or charge on the
battery after the engine is started. All
electrically operated
systems and other electrical component
circuits are protected by push button
thermal circuit breakers. Switches and
instruments required for operation of the
aircraft electrical system are installed in
the instrument panel and engine control
switch panel.

POWER DISTRIBUTION

The 24-volt
system depends upon electrical
power from
sources: battery, external power
and the generator.
engine operating
generator on the line, electric
power from the generator is
provided through a circuit breaker
to the main bus
.
Effective: 03/26/2010
THRUSH AIRCRAFT, INC - MODEL S2R-G10
for engine
requiring
A
instrument panel,
motors, lighting
D.C. electrical
three different
With the
and the
CAUTION
Gases given off by a battery
under charging conditions are
flammable.

BATTERY AND EXTERNAL POWER

Two 24-volt storage batteries provide power
to the circuit breaker through relays. A two-
position (BAT OFF-ON) switch located on
the engine control switch panel controls the
relays. Placing the battery switch in the ON
position closes the relay to supply power to
the circuit breaker bus from the battery or
external power. Placing the battery switch in
the OFF position de-energizes the battery
relay and terminates the supply of power to
the electrical system.

BATTERY SERVICING

Initial servicing of a dry charge GE50C
battery is as follows:
A. Remove seals (if present) from cells.
B. Fill each cell with 1.285 specific gravity
sulfuric acid to bottom of split ring. Use
only glass, rubber or plastic materials for
containing battery electrolyte fluid during
servicing and wear protective clothing
and rubber gloves
electrolyte to prevent personal injury.
Use a solution of baking soda and water
to neutralize any acid spilled on clothing,
skin or any damageable surface.
C. Sway the battery from side to side to
release any trapped air. Re-adjust the
electrolyte as necessary.
D. Let battery sit unused for one hour.
E. Check and re-adjust electrolyte level as
necessary by adding more electrolytes
to obtain proper level as stated in
procedure B.
F. Install vent plugs tightly into each cell.
G. Clean and neutralize
electrolyte on battery.
when handling
any spilled
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