Voltmeter; Ammeter; Hopper Quantity (Optional Equipment); Calibration Of Remote Gauge - Thrush Aircraft S2RHG-T65 TURBO THRUSH Maintenance Manual

THRUSH AIRCRAFT INC – MODEL S2RHG-T34 TURBO THRUSH
resistance transducers, one installed in each tank.
transducer float produces a minimum resistance through the transducer, permitting
maximum current flow through the fuel quantity indicator and maximum pointer
deflection. As the fuel level of the tank is lowered, resistance in the transducer is
increased, producing a decreased current flow through the fuel quantity indicator and a
small pointer deflection. The fuel quantity indicating system is calibrated by adjusting
the fuel quantity transducer float arms and the indicator as outlined in Section V.
A voltmeter displays electrical system voltage when the master switch is on and allows
the pilot to monitor bus bar voltage. Normal voltmeter readings must be within the
green arc (24.0 to 30.5 volts). Insufficient voltage or overcharging is indicated by a
lower red arc (minimum) 16.0 to 22.5 volts, and an upper red arc (maximum) 30.5 to
36.0 volts respectively. Continuous operation over 30.5 volts is detrimental to the life of
the battery and could cause loss of electrical power. A yellow arc from 22.5 to 24.0
volts indicates a caution range.
The ammeter displays current flow, in amperes, from the aircraft generator to the
battery, or from the battery to the electrical system. With the engine operating, the
ammeter should indicate the on charge side unless there is an aircraft generator
malfunction, or if the electrical load demand exceeds the aircraft generator output, the
ammeter will indicate the discharge side. Continuous operation on the discharge side
will be detrimental to battery life and may cause loss of electrical power.

HOPPER QUANTITY (OPTIONAL EQUIPMENT)

The hopper quantity consists of three parts -- the level sensing element in hopper, FA-A
control box normally located on left side of cockpit, and quantity gauge located in
instrument panel. The gauge is adjustable between 0 gallons to 360 gallons and
incorporates two lights, one amber light for low quantity, and one red right for hopper
empty. The system can be calibrated as per the following instructions.
A scale is provided to show the relationship of the remote
gauge, % scale on analog control unit type FA-A, and number
of inches the bottom of the floating ball is away from the top of
the lower stop collar. The column labeled ground shows how
many gallons are in the hopper with the aircraft in the ground
attitude in relationship to the remote gauge reading.
A. The remote hopper level gauge markings are an indication of hopper load in level
flight.
8-6
AIRCRAFT MAINTENANCE MANUAL

VOLTMETER

AMMETER

* NOTE *

CALIBRATION OF REMOTE GAUGE

The full tank position of the
Effective: 05/05/04