Induction System - Arrow PA-28R-201 Pilot's Operating Handbook And Faa Approved Airplane Flight Manual

PIPER ,oWRCRAFT CORPORATION
PA-28R-201, ARROW
7.7 INDUCTION SYSTEM
SECTION 7
DESCR/OPERA TION
The induction system incorporates a Bendix RSA-SAD I type fuel
injector. The injector is based on the principle of differential pressure, which
balances air pressure against fud pressure. The regulated fuel pressure
established by the servo valve when applied across a fuel control (jetting
system) makes the fuel flow proportional to airflow. Fuel pressure
regulation by the servo valve causes a minimal drop in fuel pressure
throughout the metering system. Metering pressure is maintained above
most vapor forming conditions while fuel inlet pressure is low enough to
allow use of a diaphmgm pump. The servo system feature also checks vapor
lock and associated starting problems.
The servo regulation meters fuel flow proportionally with airflow and
maintains the mixture as manually set for all engine speeds. The fuel flow
divider receives metered fuel and distributes fuel to each cylinder fuel nozzle.
The fuel flow portion of the manifold pressure/fuel flow gauge is
connected to the flow divider and monitors fuel pressure. This instrument
converts fuel pressure to an indication of fuel flow in gallons per hour and
percentage of rated horsepower.
The alternate air source of the induction system contains a door that
functions automatically or manually.
If
the primary source is obstructed, the
door
will open automatically. It may be opened manually by moving the
selector on the right side of the quadmnt. The primary source should always
be used for takeoff.
The pilot should read and follow the procedures recommended in the
Lycoming Operator's Manual for this engine, in order to obtain maximum
engine efficiency and time between engine overhauls.
ISSUED: S.EPTEMBER 15, 1988
REPORT: VB-1365
7-3