Quote:
Originally Posted by Moggy
In the ferry pilots notes it states;
Mixture. Mixture is either Automatic Rich or Automatic Weak. The lever friction is adjusted by a knob concentric with the throttle friction control.
The throttle and mixture controls are interconnected and in some cases it will not be possible to bring the throttle back below +2 boost without moving the mixture control. In these aircraft no harm will result by moving the mixture lever back with the throttle until zero boost is obtained.
In some of the latest aircraft mixture control is fully automatic and there is either no lever or if one is fitted it is wired in WEAK.
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I can only guess that the automatic mixture function enriches the mixture when required and if the lever was wired in Rich it would override the automatic function which would not be able to Lean the mixture. Just a guess though.