SOCATA
MODEL TB 20
SECTION 7
DESCRIPTION
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© 1988, 1991, 1992, 1994 to 1996, 1997, 2000 -
socata
- All rights reserved
June 30, 1988
Revision 2
7.34
EXHAUST SYSTEM
Exhaust gas from each cylinder is collected by pipes to be conducted, in
order to reduce its noise level to an exhaust duct which vents it outboard on
R.H. side of lower engine cowl.
PROPELLER
The airplane is fitted with all–metal, two–bladed, constant–speed,
governor–regulated propeller. The propeller control actuates on the
governor. According to the control position, the governor determines
propeller rotation speed, and thus the engine speed to be maintained. The
governor controls flow of engine oil, boosted to high pressure by the
governing pump, on a piston located in propeller hub. Oil pressure twists the
blades toward high pitch (low RPM). When oil pressure to the piston is
relieved, the blades twist to low pitch (high RPM).
FUEL SYSTEM
) consists of two vented integral
fuel tanks (one in each wing), a selector valve, a filter, an auxiliary fuel pump
as well as an engine–driven fuel pump, a fuel distributor and six fuel–injection
nozzles.
Engine–driven fuel pump suction draws fuel from L.H. or R.H. tank through
the three–position selector valve and a filter.
The selector valve is controlled through a knob labeled ”FUEL SELECTOR”
The selector valve knob has following positions labeled : ”CLOSED”, ”LEFT”,
”RIGHT”.
Then, the fuel goes through the auxiliary fuel pump (electric) and supplies the
engine fuel pump. The engine pump supplies fuel under pressure to injection
unit. The fuel is then conducted to the divider, to the injectors in the cylinders.
A dual indicator gives the manifold pressure as well as the fuel flow and
pressure (the fuel pressure is a nozzle pressure picked up on the flow
divider).
