Secondary Structures And Systems - Engine Controls - P&M Aviation QUIK GT450 Operating Instructions Manual

11.3. SECONDARY STRUCTURES AND SYSTEMS - ENGINE CONTROLS

Throttle
The primary throttle control is foot-operated (forward for full power and rearward for power off) and
complemented by the friction-damped hand throttle (forward power on and rearward off) on the left side of
the seat frame.
A cut out switch may be optionally fitted in the hand throttle to prevent starter operation unless the
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throttle is closed. Therefore for all starts including airborne restarts, THE HAND THROTTLE MUST
BE CLOSED.
Choke
The choke control is by means of a lever located on the left side of the seat. The lever is down for choke
OFF, forward for choke ON. Normal operation is always with choke off.
Contact Switches
Two ignition-kill switches - one for each ignition system - (up for on/down for off) are fitted, one in front of the
other, on the starboard side of the seat frame. The two switches should normally be operated together by
stroking with a finger or thumb.
The switches operate in the "normally open" mode, so they have to close the circuit to kill
the engine. In the unlikely event of a switch failure, kill the engine using the choke. If this
fails, turn off the fuel. With the fuel turned off, the engine may take some minutes to stop, as
all the fuel in the carburettors must be used up.
Ensure the contact switches are off whenever you leave the aircraft. Failure to do so could
result in injury or death when the propeller is handled during the next pre-flight check
procedure.
Mixture control
The optional mixture control system works by applying reduced air pressure to the carburettor float
chambers, so reducing the fuel flow through the carburettor jets. The mixture leaning control is a valve on the
instrument panel which applies either ambient pressure (rich) or partial carburettor venturi pressure (lean) to
the float chambers. The pressure can be monitored by a gauge. Maximum leaning is limited by the size of
the air vent jet.
The mixture should be set fully rich at all times except when cruising at a steady altitude, speed and throttle
setting. The exhaust gas temperature (EGT) must be monitored when leaning the mixture, it must not
exceed 800C. Observe all other engine limitations before and after leaning.
Quik & Quik GT450 Aircraft Operating Instructions
th
29 March 2007
Issue 1
WARNING
!
The hand throttle is set by means of a friction
device, which means it could be left open.
Always check it is fully closed before start-up.
WARNING
!
Check the choke is off before take-off. A warm
engine with choke on will not develop full power
and could cause serious problems in the climb
and could cut out altogether if the power is
reduced.
WARNING
!
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