Warm-Up; Taxiing; Ground Check - Piper Cherokee Archer II Operating Handbook

Piper Aircraft Corporation
PA-28-181, Cherokee Archer II

4.8 WARM-UP

Warm-up the engine at 800 to 1200 RPM for not more than two minutes in warm weather and four
minutes in cold. 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.

4.9 TAXIING

Before attempting to taxi the airplane, ground personnel should be instructed and approved by a qualified
person authorized by the owner. Ascertain that the propeller back blast and taxi areas are clear.
Power should be applied slowly to start the taxi roll. Taxi a few feet forward and apply the brakes to
determine their effectiveness. While taxiing, make slight turns to ascertain the effectiveness of the
steering.
Observe wing clearances when taxiing near buildings or other stationary objects. If possible, station an
observer outside the airplane.
Avoid holes and ruts when taxiing over uneven ground.
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.

4.10 GROUND CHECK

The magnetos should be checked at 2000 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 10 seconds.
Check the vacuum gauge: the indicator should read 5.0: + 1" Hg at 2000 RPM.
Check the annunciator panel lights with the press-to-test button. Also check the air conditioner.
Carburetor heat should also be checked prior to takeoff to be sure the control is operating properly and to
clear any ice which may have formed during taxiing. Avoid prolonged ground operation with carburetor
heat "ON" as the air is unfiltered.
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. 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. The engine is warm enough for takeoff when the throttle can be opened without the engine faltering.
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