THRUSH AIRCRAFT, INC - MODEL S2R-G10
AIRCRAFT MAINTENANCE MANUAL
H. Charge battery until all cells are
gassing freely and the charge
voltage and specific gravity of
electrolyte are constant over three
successive readings taken at one-
hour intervals. (This procedure may
take 18 - 24 hours with a constant
current charger.) During the period
of charging, the electrolyte
temperatures shall be maintained
between 60F and 110F (15.6C
and 43.3C). Charge rate is 3 amps.
Reduce rate by 1/2 when cells start
gassing.
I. When the battery is completely
charged, the specific gravity should
read between 1.285 and 1.295. At
this point, if electrolyte level needs to
be adjusted, remove or add
electrolyte to proper level and
recharge for one hour.
* NOTE *
For more detailed instructions,
see Gill Service Manual.
SERVICING BATTERY INSTALLED IN
AIRCRAFT
The 24-volt battery is installed aft of the
engine on the engine mount lower
longerons and is accessible through the
removable cowling skins. Check the
battery electrolyte level frequently,
especially during hot weather. If a visual
check shows low cell level, add distilled
water to bring the cell(s) up to the proper
lever. (See battery servicing instructions)
1.285 - 1.295 CHARGED
1.275 - Less RECHARGE
10-4
GENERATOR SYSTEM
The generator system consists of a
generator; voltage regulator, reverse current
relay and circuit breaker (See electrical
diagrams). The generator is connected to
the circuit breaker bus and will supply the
current demands when output voltage
exceeds battery voltage
DIAGRAMS
The Electrical Diagrams of the Model S2R-
G10 aircraft is at the end of this section.
BATTERY OPERATION
Battery operation is controlled by a battery
switch, placarded BATT-ON-OFF, located
on the switch panel in the cockpit. The
battery is capable of assuming the complete
electrical load for a limited time at 70 amps
max.
The batteries are located on the battery
plate assembly on the engine mount aft of
the engine. They are installed with two-
battery hold down rods through the battery
cover. The battery case is vented overboard
to dispose of any electrolyte or hydrogen
gas fumes discharged during normal
charging operation. Air enters the battery
compartment from an air scoop located in
the left cowl shin skin, circulates throughout
the battery compartment, and exists through
a vent in the battery and drains overboard
through a vent located on the belly skins.
BATTERY REMOVAL
A. Verify that the BATT-ON-OFF switch is
off. Disconnect external power.
B. Remove R.H. aft cowl skin.
C. Disconnect the battery and remove all
safety wire.
D. Disconnect vent tubes.
E. Remove nuts from battery hold down
rods and remove battery from
compartment.
Page Effective: 03/26/2010
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