The mixture should be leaned during cruising operation when 75% power
or less is being used. If any doubt exists as to the amount of power being
used, the mixture should be in the FULL RICH position for all operations.
Always enrich the mixture before increasing power settings.
To lean the mixture, pull the mixture control until the engine becomes
rough, indicating that the lean mixture limit has been reached in the leaner
cylinders. Then enrich the mixture by pushing the control toward the
instrument panel until engine operation becomes smooth. When leaning,
carefully observe the temperature instruments.
Always remember that the electric fuel pump should be turned ON
before switching tanks, and should be left on for a short period thereafter.
In order to keep the airplane in best lateral trim during cruising flight, the
fuel should be used alternately from each tank. It is recommended that one
tank be used for one hour after takeoff, then the other tank be used for two
hours; then return to the first tank. Do not run tanks completely dry in
flight. The electric fuel pump should be normally OFF so that any
malfunction of the engine-driven fuel pump is immediately apparent. If
signs of fuel starvation should occur at any time during flight, fuel
exhaustion should be suspected, at which time the fuel selector should be
immediately positioned to the other tank and the electric fuel pump
switched to the ON position.
4.29 APPROACH AND LANDING
Check to insure that the fuel selector is on the proper (fullest) tank and
that the seat backs are erect. The seat belts and shoulder harness should
be fastened and the inertia reel checked.
Turn the electric fuel pump ON. The mixture should be set in the full
RICH position.
The airplane should be trimmed to an initial-approach speed of about
70 KIAS with a final-approach speed of 62 KIAS* or 67 KIAS** with flaps
extended fully. The flaps can be lowered at speeds up to 89 KIAS, if desired.
The mixture control should be kept in full RICH position to insure
maximum acceleration if it should be necessary to open the throttle again.
Carburetor heat should not be applied unless there is an indication of
*Outboard Flow Strips Installed
**Outboard and Inboard Flow Strips Installed
PIPER AIRCRAFT CORPORATION
SECTION 4
PA-38-112, TOMAHAWK
NORMAL PROCEDURES
ISSUED: JANUARY 20, 1978
REPORT: 2126
REVISED: DECEMBER 18, 1978
4-21
The mixture should be leaned during cruising operation when 75% power
or less is being used. If any doubt exists as to the amount of power being
used, the mixture should be in the FULL RICH position for all operations.
Always enrich the mixture before increasing power settings.
To lean the mixture, pull the mixture control until the engine becomes
rough, indicating that the lean mixture limit has been reached in the leaner
cylinders. Then enrich the mixture by pushing the control toward the
instrument panel until engine operation becomes smooth. When leaning,
carefully observe the temperature instruments.
Always remember that the electric fuel pump should be turned ON
before switching tanks, and should be left on for a short period thereafter.
In order to keep the airplane in best lateral trim during cruising flight, the
fuel should be used alternately from each tank. It is recommended that one
tank be used for one hour after takeoff, then the other tank be used for two
hours; then return to the first tank. Do not run tanks completely dry in
flight. The electric fuel pump should be normally OFF so that any
malfunction of the engine-driven fuel pump is immediately apparent. If
signs of fuel starvation should occur at any time during flight, fuel
exhaustion should be suspected, at which time the fuel selector should be
immediately positioned to the other tank and the electric fuel pump
switched to the ON position.
4.29 APPROACH AND LANDING
Check to insure that the fuel selector is on the proper (fullest) tank and
that the seat backs are erect. The seat belts and shoulder harness should
be fastened and the inertia reel checked.
Turn the electric fuel pump ON. The mixture should be set in the full
RICH position.
The airplane should be trimmed to an initial-approach speed of about
70 KIAS with a final-approach speed of 62 KIAS* or 67 KIAS** with flaps
extended fully. The flaps can be lowered at speeds up to 89 KIAS, if desired.
The mixture control should be kept in full RICH position to insure
maximum acceleration if it should be necessary to open the throttle again.
Carburetor heat should not be applied unless there is an indication of
*Outboard Flow Strips Installed
**Outboard and Inboard Flow Strips Installed
PIPER AIRCRAFT CORPORATION
SECTION 4
PA-38-112, TOMAHAWK
NORMAL PROCEDURES
ISSUED: JANUARY 20, 1978
REPORT: 2126
REVISED: DECEMBER 18, 1978
4-21