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The chart on the preceeding page should be used to establish mixture
settings in take-off, climb and cruise conditions.
For maximum performance take-off, mixture may
be
set during static
full power run-up, if feaSible, or during the ground roll.
NOTE
Enrichen mixture during climb if excessive cylinder
head temperatures occur.
In the event that a distinct peak is not obtained, use the corresponding
maximum EGT as the reference point for enriching the mixture to the de
sired cruise setting.
Changes in altitude or power setting require the EGT to be rechecked.
Mixture may be controlled in cruise descent by simply enriching to avoid
engine roughness. During prolonged descents, maintain sufficient power
to keep the EGT needle on scale. In idle descents or landing approaches
use full rich mixture. For idle descents or landing approaches at high
elevations, the mixture control may be set in a position to permit smooth
engine acceleration to maximum power.
TRUE AIRSPEED INDICATOR
A true airspeed indicator is available to replace the standard air
speed indicator in your airplane. The true airspeed indicator has a cali
brated rotatable ring which works in conjunction with the airspeed indi
cator dial in a manner similar to the operation
of
a flight computer.
TO OBTAIN TRUE AIRSPEED, rotate ring until pressure altitude
is aligned with outside air temperature in degrees Fahrenheit. Then,
read true airspeed on rotatable ring opposite airspeed needle.
NOTE
Pressure altitude should not be confused with indicated
altitude. To obtain pressure altitude, set barometric
scale on altimeter to "29.92" and read pressure altitude
on altimeter. Be sure to return altimeter barometric
scale to original barometric setting after pressure alti
tude has been obtained.
ELECTRIC ELEVATOR TRIM SYSTEM
An electric trim system is available to facilitate trimming the air
plane. The system is controlled by a slide-type trim switch on the left
side of the pilot's control wheel and a disengage switch located above the
elevator trim control wheel. Pushing the trim switch to the forward
position, labeled "DN,
If
moves the elevator trim tab in the "nose down"
direction; conversely, pulling the switch aft to the "UP" position moves
the tab in the "nose up" direction. When the switch Is released, it
automatically returns to the center off position, and elevator trim tab
motion stops. The disengage switch, when in the "DISENGAGE" posi
tion, removes all electrical power from the system by de-energizing the
motor and clutch circuits.
A servo unit, (which includes a motor and chain-driven, solenoid
operated clutch) in the right tail boom, actuates the trim tab to the select
ed position. When the clutch is not energized (trim switch off) the elec
tric portion of the trim system freewheels so that manual operatlon is not
affected.
It
also freewheels while the wing flaps - elevator tab intercon
nect system is operating. The electric trim system can be overpowered
at any time by manually rotating the trim wheel, thus overriding the servo
that drives the electric trim tab.
.
NORMAL OPERATION.
To operate the electric elevator trim system, proceed as follows:
(1)
(2)
(3)
(4)
Master Switch -- "ON. "
Elevator Trim Disengage Switch -- "ON" (aft p
Trim Switch -- Actuate as desired.
Elevator Trim Position Indicator -- Check.
osition).
NOTE
To check the operation of the disengage switch, actuate
the elevator trim switch with the disengage switch in the
disengage position. Observe that the manual trim wheel
and indicator do not rotate when the elevator trim switch
is activated.
7-19
7-18
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