Warm-Up; Ground Check - Piper cherokee WARRIOR Pilots Operating Manual

CHEROKEE WARRIOR
2.
Connect the RED lead of the PEP kit jumper cable to the POSITIVE 1+1
terminal of an external l2-volt battery and the BLACK lead to the NEGATIVE
(-) terminal.
3.
Insert the plug of the jumper cable into the socket located on the airplane's
fuselage.
Turn the airplane master switch ON and proceed with the normal engine starting
technique.
After the engine has been started, turn the master switch OFF and disconnect
the jumper cable plug from the airplane.
Turn the master switch ON and check the alternator ammeter for indication of
output. DO NOT ATTEMPT FLIGHT IF THERE IS NO INDICATION OF
ALTERNATO R O I.-TTPIj"T.
WARM-UP
Warm-up the engine at 800 to 1200 RPM for not more than two minutes in warm weather
or four minutes in cold weather. Avoid prolonged idling at low RPM as this practice may result
in fouled spark plugs. If necessary to hold before takeoff, it is recommended that the engine be
idled at 1200 RPM.
Takeoff may be made as soon as the ground check is completed, provided the throttle may
be opened fully without backfiring or skipping and without a reduction in engine oil pressure.
GROUND CHECK
Check the magnetos at 2000 RPM by switching from BOTH to RIGHT, then back to
BOTH before switching to LEFT. The drop on either magneto should not exceed 175 RPM, and
each magneto should read within 50 RPM of the other. Prolonged operation on one magneto
should be avoided.
Check the vacuum gauge; the indicator should read 5" + .l " Hg at 2000 RPM.
Check both the oil temperature and 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 oil pressure is within
limits, the engine is ready for takeoff.
Check the annunciator panel lights with the press-to-test button*.
Carburctor hcat should also bc checkcd prior tr.r takcoff to be sure that the control is
operating properly and to clear any ice that may have formed during taxiing. Avoid prolonged
operation with carburetor heat ON as the air is unfiltered. Be sure that carburetor heat is OFF
for takeoff.
Operation of the engine driven fuel pump should be checked while taxiing or during
preflight engine runup by switching the electric fuel pump OFF and observing the fuel pressure
gauge. The electric fuel pump should be ON during takeoff 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 fully opened without the engine faltering.
*Serial nos. 7515001 and up
OPERATING INSTRUCTIONS
REVISED: JLJNE 14.1974
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