Lancair Legacy, Pilot'S Operating Handbook And Flight Manual

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VII-10 February 2008
Legacy
VII-11 February 2008
Legacy
cooled design provided with magnetos for ignition, a starter and alternator. The
simplicity of these powerplants aids in their reliability providing they are given
the care such a mechanical device requires. Since this is your only source of power
for flight it only makes sense to give it that extra bit of care so that it can take care
of you hour after hour.
CONTINENTAL AND LYCOMING
Engine Controls
All engines are equipped with dual magnetos which are shorted in the OFF position.
It is mandatory that operation of the mags be checked prior to each flight. In the
normal operations section of this manual the proper run-up checks are described.
Operation on either magneto should be smooth or the flight should be aborted and
the problem resolved. The propeller should never be rotated on the ground with-
out assuming that the mags are “hot” and the OFF position should be checked for
operation by briefly switching the mags to the OFF position while at idle rpm prior
to each shutdown. Normal shutdown then is accomplished by putting the mixture
control in the cut-off position, running the engine dry of fuel.
All engines utilize a throttle to control the amount of airflow into the engine, re-
stricting it with a butterfly (throttle) valve in the intake system. Full throttle allows
unrestricted airflow into the engine resulting in manifold pressures up to ambient or
even greater if you have some form of ram air pressure recovery system, resulting
in maximum power output.
Controllable propeller engines also have a prop control which controls the engine
R.P.M. and maintains it at a set level. Maximum engine RPM at maximum throttle
settings are desired for takeoff. Cruise power settings reduce engine rpm com-
mensurate with manifold pressure.
Fuel/air ratio is also controlled to compensate for the large air density changes due
to operation at altitude. This mixture control reduces the fuel quantity provided to
the engine from “Rich” to “Lean.” Leaning should be accomplished in accordance
with the engine manufacture recommendations.
Engine Instrumentation
Oil: Oil, the life blood on an engine is of prime concern. Oil quantity is only
measurable prior to flight and is a mandatory item in the checklist. Perhaps the most
important measurement during operation is oil pressure. Oil temperature is another
valuable measurement. Proper oil type and viscosity per the engine manufacturer’s