Rudder pedals spring modification
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Hello,

My (certified) aircraft visited the manufacturer workshop to troubleshoot several... youth issues. Among them, a left-yawing tendency. Following this visit, the aircraft flies straight. There is no mention of any modification in the aircraft documentation. My best guess is they shortened the rudder pedal springs on one side. When I ask the question, the answer I get is "we have no idea, it's something we do on a standard basis, it's an internal procedure".

So my question is : can it be done without recording it ?

Thanks for your insight,

Nick.
4 Replies
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I would suspect the shop adjusted a mis-rigging issue either in a rudder trim bungee/spring or an aileron/rudder interconnect.  Since you say “youth issues” it was something possibly not right from the factory which itself is the bigger issue. These are “normal” service adjustments and would not require invasive work to the external surfaces and work done could be somewhat cryptic in the log entry.   
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Nicolas Bertolami:
Thank you for your answer. I don't want to include the name of the manufacturer to avoid fingerpointing.
.

Then it's not going to be possible to guess what they might have done. But whatever they did should have been logged.

Thank you for your answer. I don't want to include the name of the manufacturer to avoid fingerpointing.

And the rudder is a solid piece of composite, including the trim tab. To correct for left yaw, it would have to be lenghtened, which I understand means splitting the original trim tab, and including a larger piece inside. It has not been done...
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1147 Posts
Well, it certainly can be done without logging it, but it would not be legal to do so.  And that might not even be an authorized modification of the plane, so it might not be legal even with a log entry.  But, I don't think that's what they did.  Without knowing the make/model of plane I can't be sure, but I suspect it's more likely they adjusted the rudder trim tab.