4.15 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
and the engine is warm.
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.
4.17 TAXIING
Before ground personnel attempt to taxi the airplane, they 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.
4.19 GROUND CHECK
Set the parking brake. The magnetos should be checked at 1800 RPM.
Drop off on either magneto should not exceed 175 RPM and the difference
between the magnetos should not exceed 50 RPM. Do not operate on
a single magneto for too long a period, 2 to 3 seconds is usually
sufficient to check drop off and will minimize plug fouling.
PIPER AIRCRAFT CORPORATION
SECTION 4
PA-38-112, TOMAHAWK
NORMAL PROCEDURES
ISSUED: JANUARY 20, 1978
REPORT: 2126
REVISED: JANUARY 15, 1981
4-17
4.15 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
and the engine is warm.
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.
4.17 TAXIING
Before ground personnel attempt to taxi the airplane, they 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.
4.19 GROUND CHECK
Set the parking brake. The magnetos should be checked at 1800 RPM.
Drop off on either magneto should not exceed 175 RPM and the difference
between the magnetos should not exceed 50 RPM. Do not operate on
a single magneto for too long a period, 2 to 3 seconds is usually
sufficient to check drop off and will minimize plug fouling.
PIPER AIRCRAFT CORPORATION
SECTION 4
PA-38-112, TOMAHAWK
NORMAL PROCEDURES
ISSUED: JANUARY 20, 1978
REPORT: 2126
REVISED: JANUARY 15, 1981
4-17
