AFMS
N°D02
FOR VARIABLE PITCH PROPELLER EQUIPPED AIRPLANES
Page V7-10
4.1
E
NGINE CONTROL LEVER
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 of flight (longitudinal).
Mixture control lever
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 fuel)
Lever to rear (LEAN) >>Mixture lean (in fuel)
To shut off the engine the mixture control lever is pulled to the rear stop: air without
fuel is drawn into the cylinders that shuts down.
Throttle
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 supplied 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.
CAUTION
Following failure of the governor or a serious drop in oil pressure,
the RPM should be adjusted using the throttle. Every effort should
be made not to exceed 2700 RPM.
CAUTION
The throttle and RPM lever should be moved slowly, in order to
avoid over-speed and excessively rapid RPM changes.
Section 9 – Supplements
ENGINE CONTROLS
2
nd
Edition, Rev. 0
Summary of Contents for P2010
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