AFMS
N•
oo7
FOR
GARMIN
GFC700
AUTOPILOT
AND
VARIABLE
PITCH
PROPELLER
EQUIPPED
AEROPLANES
4.1
ENG
IN
E
CONTROL
LE
VER
Engine handling
is
via three levers: Throttle, RPM lever, Mixture control lever.
They're situated on the center control; the use of"front/forward" and
"rear/backward"
is
defined
in
relation
to
the direction
offlight
(longitudinal).
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This lever (right hand lever with red handle) controls the fuel-air mixture, which
is
supplied to the engine.
With the lever full forward, extra
fuel
is
being supplied to the engine which at
higher performance setting contributes to engine cooling.
In
cruise, the mixture should be made leaner
in
order to reach the appropriate
fuel-air mixture. The leaning procedure
is
given
in
Chapter 4.
Lever forward (RICH)>> Mixture rich (in
fue
l)
Lever
to
rear (LEAN) >>Mixture lean (in fuel)
To shut
off
the engine the mixture control lever
is
pulled to the rear stop: air with-
out fuel
is
drawn into the cylinders that shuts down.
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This lever (left hand with large knob)
is
used to control manifold pressure (MAP).
High manifold pressure means a large quantity
of
fuel-air mixture is being sup-
plied to engine, while low manifold pressure means a lesser quantity
of
fuel-air
mixture
is
being supplied.
Propeller lever
By means
of
this lever (central lever with blue handle) the propeller governor
controls the propeller pitch, and consequently engine RPM. A selected RPM
is
held constant by the governor independent
of
the airspeed and the throttle setting.
Lever forward (HIGH RPM) = fine pitch
Lever rearward (LOW RPM) = coarse pitch
Following a defect
in
governor
or
oil system, the blades go
to
the finest possible
pitch (maximum RPM), thus allowing continuation
of
the flight.
I
•
I
•
Following failure
of
the governor
or
a serious drop m
011
pressure.
the RPM should be adjusted using the throl/le. Every effort should
be made not to exceed 2700
RPM.
The
throttle
and
RPM lever should be moved slowly,
in
order to
avoid over-speed
and
excessively rapid RPM changes .
Ed.
2, Rev.O
Section
7 -
Airframe
and
Systems
description
ENGINE
CONTROLS
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