Fuel Quantity Indicator; Removal; Installation - Thrush Aircraft S2R–T660 Maintenance Manual

THRUSH AIRCRAFT INC - T660 TURBO THRUSH
vary the current flow through the indicating circuit. As the current flow varies, the needle on the fuel
quantity indicator will indicate the level of fuel sensed by the fuel quantity transmitter.
One fuel quantity indicator is installed in front of the pilot in the left instrument panel. This instrument
is a single reading indicator that serves either the left of right fuel tank by operation of an electric fuel
tank-selector switch on the left instrument panel. A transmitter installed in each fuel tank sends
input signals to the indicator that gives the proper level of fuel in each tank. The instrument face is
marked in increments from empty to full. Refer to Section VIII for additional information.
The fuel quantity transmitters are installed in the inboard aft corner of the wing fuel tanks. Access to
the transmitter is gained by removing the inboard cover plate. As the fuel level increases, the float
arm is repositioned. This produces a minimum resistance through the transmitter, permitting
maximum current flow through the fuel quantity indicator and maximum pointer deflection. As the
fuel level is lowered, resistance in the transmitter is increased, producing a decreased current flow
through the fuel quantity indicator and consequently a smaller pointer deflection on the fuel quantity
indicator.

Removal

Removal of the fuel quantity transmitter can be accomplished through the inboard cover plate on
the upper surface of the wing.
A. Defuel aircraft as outlined in Section II.
B. Remove inboard cover plate.
C. Disconnect electrical leads at the transmitter.
D. Remove attaching screws, washers and bushings, and carefully remove transmitter
assembly.

Installation

The transmitter can be installed by reversing the removal procedures. Do not damage float or bend
float arm when placing the transmitter into the tank or incorrect readings will result.
Effective: 12/17/03
AIRCRAFT MAINTENANCE MANUAL

FUEL QUANTITY INDICATOR

TRANSMITTER
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