SECTION
Vll
MQBNEY
AIRPMNE
AND
SYSTEMS
DESCRIPTION
MODEL
M%OJ
may indicate that a clogged vacuum filter element is preventing adequate air
intake.
A
vacuum annunciator light is provided to monitor system operation.
Electrical power is supplied by an engine belt driven
28
Volt,
70
ampere alter-
nator.
The propeller is an all metal,
two blade,
constant speed unit.
Constant
propeiler rotational speed
(WPM) is maintained by
a
balance of air- load and
engine rotational forces. The propeller governor regulates the flow of engine
oil
to
a
piston in the propeller dome. The piston
is
linked by a sliding rod and
fork arrangement to propeller blades. Governor oil pressure works against
the piston and a spring to increase propeiler blade pitch, thus decreasing
propeller and engine
RPM.
Centrifugal
twisting
moments on the
propelier
blades work to decrease propeller blade pitch and increase
RBM.
Control of
these and other forces to maintain a constant
RPM
is provided by the
propeller control lever in the cockpit.
Ttle propeller control lever, linked by cable to the propeller governor, deter-
mines a wide range of in-flight
RPM.
Pushing the lever forward selects higher
RPM.
Pulling the
lever aN selects iower RFM. When in flight the
WPM
should
not fluctuate significantly, regardless of throttle setting.
The
propeller may be operated within the full range of
WPM
indicated
by
the
tachometer, up to the red radial
lir~e. In cruise, always use the power setting
charts provided. On cold days during run-up, exercise the propeller several
limes to flow warm oil into
the propeller hub. This assures propeller govern-
ing for takeoff.
REV.
B
6-12-87
ISSUED
6-2-86
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