Battery Operation; Battery Removal; Battery Installation; Voltage Regulation - Thrush Aircraft S2RHG-T65 TURBO THRUSH Maintenance Manual

Table of Contents

THRUSH AIRCRAFT, INC – MODEL S2RHG-T65 TURBO THRUSH

Battery operation is controlled by a battery switch, placarded BATT-ON-OFF, located on

the switch panel in the cockpit.

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.

Verify that the BATT-ON-OFF switch is off. Disconnect external power.

Remove R.H. aft cowl skin.

Disconnect the quick disconnect from the battery and remove all safety wire.

Disconnect vent tubes.

Remove nuts from battery hold down rods and remove batteries from

compartment.

Reverse battery removal procedure.

The generator output voltage is regulated by the voltage regulator circuitry. By using an

integrated circuit comparator amplifier with a regulated reference voltage, and difference

between the reference voltage and the generator voltage is amplified and supplied to the

comparator circuit, which controls the shunt field excitation of the generator. Prior to

installation, the voltage regulator is adjusted under NO load condition to maintain 26.5±.2

volts DC generator output voltage. After installation, the generator over voltage control

should be adjusted to 27.5 VDC generator output voltage at the bus with normal systems

turned on.

Gain access to the voltage regulator by removing R.H. aft cowl skin. If removal is

necessary, proceed as follows:

Verify that the battery switch is OFF, that the external power is disconnected, and

that the batteries are disconnected.

Disconnect the retaining clips from the voltage regulator and remove voltage

regulator from voltage regulator base.

Verify that the battery switch is OFF.

Effective: 05/05/04

AIRCRAFT MAINTENANCE MANUAL