Piper COMANCHE 260 User Manual

SECTION II THE PIPER COMANCHE
speed, controllable unit, It is controlled entirely by use of the
propeller control located in the center of the lower instrument
panel.
INDUCTION SYSTEM
The Lycoming engine induction system in the Comanche is
equipped with a Marvel Schebler model MA-4-5 carburetor or
a Bendix RSA-5ADI fuel injector.
The carburetor installed on the O-540-E engine is of the
single barrel float type, and is equipped with a manual altitude
mixture control and an idle cut-off. Distributionof the fuel-air
mixture to eachcylinder isobtained by the center zone induction
system, which is integral with the oil sump and is submerged
in oil, insuring a more uniform vaporization of fuel. From
the riser the fuel-air mixture is distributed to each cylinder.
The fuel injector installedon the I0-540-D engine is based
on the principle of measuring air flow and using the air flow
signals to operate a servo valve. The accurately regulated
fuel pressure established by the servo valve, when applied
across a fuel control (jetting system), makes fuel flow pro-
portional to air flow.
Fuel pressure regulation, by means of the servo valve;
necessitates only a minimum fuel pressure drop through the
entire metering system. This makes it possible to maintain
metering pressure above vapor forming conditions, and at the
same time requires a fuel inlet pressure sufficiently low so
that a diaphragm pump can be used. An inherent feature of the
servo system is self-purging which eliminates any possibility
of vapor lock and associated problems of difficult starting.
The injection system components consists of a Servo Reg-
ulator which meters fuel flow in proportion to air flow to the
engine, giving proper fuel-air mixture at all engine speeds. A
Flow Divider receives the metered fuel and accurately divides
fuel flow to each cylinder Fuel Nozzle.
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Piper COMANCHE 260 Specifications

General

Brand	Piper
Model	COMANCHE 260
Category	Aircrafts
Language	English