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CARBURETTOR CONTROLS
Carburettor mixtures are controlled
automatically for most efficient engine operation
at different altitudes. There are four mixture con-
trol positions: EMERGENCY, AUTO RICH,
AUTO LEAN and IDLE CUT-OFF. The con-
trols are to the right of the throttles on the
pedestal.
C ar bu re t t or
Mixture Con tro l s
To operate the controls, first press the
trigger lock fitted to each control and then move
the control to the desired position.
Here are the effects which the controls
produce at the different positions:
EMERGENCY - full rich mixture. This
position overrides any automatic function.
AUTO RICH - rich mixture
AUTO LEAN - lean mixture
An automatic feature of each carburet-
tor functions in either of these positions. This
feature is an altitude compensator unit. As the
airplane climbs or descends, a diaphragm in this
unit measures the outside air pressure. It is very
sensitive. reacting to minute changes in pressure
and temperature. As the diaphragm expands and
contracts, it meters fuel into the induction system
to keep the fuel/air ratio at its most efficient level.
IDLE CUT-OFF - stops the flow of fuel.
Note: AUTO RICH and AUTO LEAN are
sometimes referred to as "Takeoff and climb"
and "Cruise".
Carburettor heat controls: These controls
are located in a quadrant just below the main in-
strument panel on the right side of the pedestal.
Positions: HOT and COLD. When you
need carburettor heat to offset icing conditions,
open the LOCK lever and move each control to
HOT. This brings heated air from the around the
cylinder heads into the induction system.
Leave the controls in COLD for all nor-
mal operations and ALWAYS LOCK them.
C a r b ur ett o r
H ea t C o n t ro l s
OIL SYSTEM
There are two oil tanks, one in each na-
celle with a capacity of 29 gallons each.
Oil temperature and pressure gauges are
on the main instrument panel in front of the co-
pilot, together with low pressure warning lights.
Keep oil pressures between 75 and 90 psi
in normal flight operation. Don't let them get be-
low 60 or above 100 psi, if you are flying in emer-
gency situations. If pressures drop below 50 psi,
the red warning lights will glow.
ELECTRICAL SYSTEM
Two engine-driven generators supply
electric current to your airplane and charge two
88-ampere-hour batteries, housed under the
nose of the airplane. (The battery compartments
are mounted on telescopic arms which extend
downwards to enable servicing of the batteries.)
In this simulation these are activated when the
GROUND-POWER switch is operated.
There is a master battery switch mounted
on the left upper panel. This is left OFF while
starting engines using an external power source.
Whenever possible, start engines using an
exterior battery cart (sometimes called Ground
Power Unit). This saves battery power.
You can start engines on battery power
alone. If you are going to use the starting cart,
switch up the GroundPower switch and check
outside to see the cart visible, connected to the
batteries
15
LIGHTS
There is a variety of exterior lighting on
the DC-3. The main groups are:
A. LANDING LIGHTS
B. PASSING LIGHT ( Red, incorporated
in the left landing light housing)
C. NAVIGATION LIGHTS
D. TAIL LIGHTS (Red and White)
Some lights have dim and bright fila-
ments which can be switched, others have steady
and flash states.
All switches for these lights are located
on the left or right upper panels.
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