Flight Instructors Training Procedures _revised AIC_x

4. EFFECT OF TRIM
i. The student maintains a constant attitude
while each trimmer is moved in turn. The
student then adjusts the trimmers until the
control forces are removed. Use cruise
power.
ii. Effect of power changes on trim.
5. EFFECT OF THROTTLE, PROPELLER
CONTROL AND MIXTURE CONTROL
)
ii. Larger rudder and elevator effectiveness.
Smaller movements for comparatively large
changes of attitudes. Ailerons unchanged.
(The feel of ailerons is a good indication of
airspeed).
i. Increasing load on rudder or elevator.
ii. Sense of trim control movements.
iii. Adjustment to relieve control forces.
iv. Thus aircraft remains in the selected
attitude when accurately trimmed.
NOTE:
Demonstrate that the initial adjustment to the aircraft
attitude should be made by the primary controls and
that the trimmers should then be adjusted until no
force is required on the controls to maintain attitude:-
Change, Check, Hold and Trim. During this
demonstration, ensure that the student has his hands
and feet resting lightly on the controls, otherwise he
may fail to identify the zero force trim setting.
i. Lookout.
ii. Note nose attitude and heading.
iii. Reduce power to 55%.
iv. Maintain nose attitude and heading.
v. Note increased back pressure required on
control column to maintain nose attitude.
vi. Note rudder input required for balanced
flight
vii. Re-trim elevator and rudder.
viii. Regain cruise power and repeat sequences
(i.-vii.) above.
EFFECT OF THROTTLE:-
i. Sense of throttle movement.
ii. Boost (power) changes.
iii.
EFFECT OF PROPELLER CONTROL:-
i. Sense of control movement.
ii. R.P.M. changes.
iii. At very low boost settings, the throttle
controls the RPM as well as the boost and
the propeller control is relatively ineffective.
EFFECT OF MIXTURE CONTROL:-
i. At high altitudes engines run rough when
the mixture is too rich.
ii. Too lean a mixture will cause an RPM drop.
iii. If leaned off further, the engine will surge
and cut out.
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