1-20
f. when throttle is reduced (such as during descent or approach), the propeller
governor will automatically reduce blade angle to reduce propeller torque
commensurate with the reduction in engine power to maintain a constant
propeller speed. This process can be continued until the blade angle is reduced to
the low pitch stop. At this point, the propeller will behave like a fixed (fine) pitch
propeller, and further reductions in engine power will result in a drop in propeller
RPM. This is referred to as the “minimum governing power setting”; and
g. if oil pressure is lost at any time for any reason, the mechanical return spring will
reduce the blade angle to the minimum stop (fine pitch).
34. The Mixture Control is red and it regulates the amount of fuel being fed to the fuel
injection system. Pushing the control full in / forward is the FULL RICH position, pulling the
control out progressively leans the mixture until the IDLE CUTOFF position is reached.
35. The Mixture Control incorporates a vernier control feature which provides slow and/or
fine adjustments. Rotate the control clockwise to enrich the mixture and vice versa. Rapid or
large adjustments can be made by depressing the button on the end of the control knob and
reposition control as required. Detailed instructions on correct use of the mixture control are
provided in Part 2.
To optimize cylinder cooling during towing operations, the fuel
system is set for maximum fuel flow at high power settings. The
resultant rich mixture may result in spark plug fouling during
prolonged low RPM ground idling. During ground idle, the throttle
should normally be set to 1000 RPM. During extended ground idling
in high density altitude conditions, it may be necessary to manually
lean the mixture to prevent spark plug fouling. Minor spark plug
fouling can usually be cleared as follows:
b. Throttle 2200 RPM; then
c. Mixture moved toward idle cut-off until RPM peaks, hold for
10 seconds and return to full rich
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