Warm-Up; Ground Check - Piper Cherokee Six 300 Information Manual

CHEROKEE SD(.300
WARM-UP
Warm-up the engine at 1000 to 1200 RPM. Avoid prolonged idling at low RPM, as this
practice may result in fouled spark plugs.
Takeoff may be made as soon as the ground check is completed, provided that the throttle
may be opened fully without backfiring or skipping, and without a reduction in engine oil
pressure.
Do not operate the engine at high RPM when running up or taxiing over ground containing
loose stones, gravel or any loose material that may cause damage to the propeller blades.
GROUND CHECK
The magnetos should be checked at 2000 RPM with the propeller set at high RPM. Drop
off on either magneto should not exceed 175 RPM and the difference between the magnetos
should not exceed 50 RPM. Operation on one magneto should not exceed l0 seconds.
.
Check the vacuum gauge;the indicator should read 5.0" + .1" Hg at 2000 RPM. ;
i Check both oil temperature and oil pressure. The temperature may be low for some time if
the engine is being run for the first time of the day, but as long as the pressure is within limits
the engine is ready for takeoff.
Check the annunciator panel lights with the pressto-test buttonr.
The propeller control sttould be moved through its complete range to check for proper
operation, and then placed in full INCREASE RPM for takeoff. To obtain maximum RPM, push
the pedestal mounted control fully forward on the instrument panel. Do not allow a drop of
more than 500 RPM during this check. In cold weather the propeller control should be cycled
from higlr to low RPM at least three times before takeoff to make sure that warm engine oil has
circulated.
The electric fuel pump should be turned off after starting or during warm-up to make sure
that the engine driven pump is operating. Prior to takeoff the electric pump should be turned
ON again to prevent loss of power during takeoff should the engine driven pump fail. The
engine is warm enough for takeoff when the throttle can be opened without the engine
faltering.
rSerial nos. 7540001 and up
OPERATING INSTRUCTIONS
REVISED: JUNE 20,1974
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