Before Takeoff - Piper TOMAHAWK Pilot's Operating Handbook And Faa Approved Airplane Flight Manual

SECTION 4
NORMAL PROCEDURES
Avoid engagement of starter or turning the
switch to off when performing magneto check.
Check the vacuum gauge; the indicator should read 5.0" ± .1" Hg at
2000 RPM.
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.
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.
To check magneto grounding, retard the throttle to IDLE between 550
and 650 RPM and turn the magneto switch OFF, and immediately back to
BOTH. If the magnetos are properly grounded, the engine will stop firing
when the switch is in the OFF position.

4.21 BEFORE TAKEOFF

All aspects of each particular takeoff should be considered prior to
executing the takeoff procedure.
Check that the master switch is ON, and check and set all of the flight
instruments as required. Check the fuel selector to make sure it is on the
proper tank (fullest). Set the mixture; turn ON the electric fuel pump and
check the engine gauges. The carburetor heat should be in the OFF position.
The mixture should be set to FULL RICH but
a minimum amount of leaning is permitted for
smooth engine operation when taking off at
high elevation.
REPORT: 2126
4-18
PIPER AIRCRAFT CORPORATION
PA-38-112, TOMAHAWK
NOTE
NOTE
ISSUED: JANUARY 20, 1978
REVISED: MAY 10, 1982