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Mixture level hard to move
Posted: Tue Jun 02, 2020 9:59 pm
by astaib
Hello,
I asked my mechanic to work in my mixture lever because it is very hard to move since it was changed one year ago.
He told me today that he has checked hard he cannot find friction anywhere and that the cable has no high radius curvature.
Do you have any idea of where it can comes from?
Thanks!
Re: Mixture level hard to move
Posted: Tue Jun 02, 2020 10:28 pm
by Rich
Have you tried adjusting the friction control knob? It's down on the right side of the throttle quadrant.
Re: Mixture level hard to move
Posted: Tue Jun 02, 2020 10:36 pm
by shoffert
Funny story...I just discovered that knob during my first annual after flying the plane for 3 months...I don't ever sit in that seat!
Re: Mixture level hard to move
Posted: Tue Jun 02, 2020 10:57 pm
by Steve
Mine has been stiff since it was new, and despite thorough lubrication. I've just gotten used to it being that way...
Re: Mixture level hard to move
Posted: Wed Jun 03, 2020 12:00 am
by Rich
The right kind of stiffness/friction is good in the engine controls. You don't want them drifting. But it's worth tracking down the source of suddenly-increased stiffness. Last year I broke the Bowden cable for the alternate air by not patiently diagnosing just such an occurrence.
Re: Mixture level hard to move
Posted: Wed Jun 03, 2020 12:17 am
by Steve
Arnaud:
Your airplane is old (excuse me - mature) enough for this Service Bulletin to apply:
Has it been done?
Steve
Re: Mixture level hard to move
Posted: Wed Jun 03, 2020 6:41 am
by astaib
Hi,
The MSB has been performed last year at annual visit, and the lever is more difficult to move since it has been changed...
The friction knob is set to loose.
I agree with you that it is better stiff than loose, if this stiffness is normal, I will accomodate, but I feel it really stiff.
This is not "sudden" this is worse since it has been changed last year.
Arnaud.
