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3.
Avoid prolonged idling at low RPM. Fouled spark plugs can
result from this practice.
4.
Leave mixture in "Full Rich". (See "Ground Operation at High
Altitude Airports," Section VI for exceptions).
5.
Warm-up 900-1000 RPM.
PRE-TAKEOFF CHECK
I.
Maintain engine speed at approximately 1000 to 1500 RPM for
at least one minute in warm weather, and as required during cold
weather to prevent cavitation in the oil pump and to assure
adequate lubrication.
2.
Advance throttle slowly until tachometer indicates an engine
speed of 1200 RPM. Allow additional warm-up time at this speed
depending upon ambient temperature. This time may be used for
taxiing to take-off position. The minimum allowable oil tempera-
ture for run-up is 75°
F.
CAUTION . .. Do not operate the engine at run-up speed unless oil
temperalllre is
75°
F. minimum.
3.
Perform all ground operations with cowl flaps, if installed, full
open, mixture control in "FULL RICH" and the propeller control
set for "Full Increase" RPM (except for brief testing of propeller
governor).
4.
Restrict ground operations to the time necessary for warm-up
and testing.
5.
Increase engine speed to 2000 RPM only long enough to
perform the following checks:
a.
Magnetos: With both magnetos "ON", position the right
magneto switch "OFF" and note engine RPM; now back to bot h
magnetos "ON" to clear the spark plugs. Then position the left
magneto switch "OFF" and note engine RPM. Now return
switch to both magnetos "ON". The difference between the two
3-5
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