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AIRCRAFT MAINTENANCE MANUAL
FUEL SUB-SYSTEMS AND
COMPONENTS
FUEL TANK VENT SYSTEM
Ref. Figure 5-2
The fuel tanks are vented to a common
manifold. Tank vent tubes extend from the
wing root to the upper forward outboard
corner of each tank.
attached to the vent manifold by hoses.
The vent manifold is a single unit
composed of five aluminum tubes welded
together.
The main cross tube is a ½"
tube. A ½" anti-siphon loop attaches the
main cross tube to the ½" ram-air tube,
which extends to the left side only. Two
¼" tubes extend from either side of the
loop just above the main cross tubes.
A ½" ram air inlet tube protrudes from the
left shin skin, below the wing, with the
opening forward. A hose connects the ram
air inlet to the ram air tube of the manifold.
The ends of the manifold main cross tube
are connected to the respective tank vent
tubes by hoses.
The two ¼" tubes are connected by hoses
to tee fittings screwed into bosses on the
inboard fuel tank ribs. The third outlets of
the tees are connected by hoses to drain
valves on the shin skins below the wings.
The fuel vent manifold is installed forward
of the hopper, above and forward of the
wing spar.
This position puts the anti-
siphon loop above the tank vent tube ends
in any ground attitude, ensuring no fuel
loss through the vent system.
CAUTION
Before the first flight of the day,
ensure that the ram air inlet is
clear. Blockage, such as by a
"dirt dobber", could cause fuel
starvation.
5-4
Page
THRUSH AIRCRAFT INC – MODEL S2R G10
The tubes are
FUEL QUANTITY INDICATOR
Ref. Figure 5-3
A single fuel quantity indicator is installed
in the left instrument panel. This indicator
serves either the left or right fuel tank by
operation of a fuel tank-selector switch
adjacent to the indicator.
responds to the current flowing through the
fuel quantity transmitter by positioning the
needle proportionately.
face is marked in increments from empty
to full. Figure 5-1 shows the amount of
fuel in the tank at several pointer positions.
Refer
to
Section
information.
FUEL QUANTITY TRANSMITTER
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 aft top cover
plate. The transmitters have a multi-coil
resistor and a contactor that is moved
along the resistance coil by the float arm.
The resistance thus varies in proportion to
the float arm position.
resistance results in varying current flow
through the indicating circuit.
current flow varies the needle on the fuel
quantity indicator moves proportionately
to indicate the fuel level in that tank.
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 2.
B. Remove inboard cover plate.
C. Disconnect electrical leads at the
transmitter.
D. Remove attaching screws, washers
and bushings, and carefully remove
transmitter assembly.
The indicator
The instrument
8
for
additional
The varying
As the
Effective: 03/26/2010
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