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206 Hydralic Servo


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I've noticed that the tube that connects the fore/aft cyclic servo to the bellcrank on a 206BIII is very stiff when I try to rotate it.

It will rotate but it is really stiff.

How tight can this be before service?

I always thought they should move pretty easy with actually being sloppy.

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It should be. Tighten a bolt into the bearing and run it in with a drill. Not too much as you dont want to over loosen it. I did see it mentioned in the books, but it was some time ago.

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Fore/aft cyclic servo is an A-Star term.

 

The 206 has 2 cyclic and one collective servo.

If the tube from the servo to the bellcrank seems tight, 'stir' the cyclic stick and try again.

 

It's probably just the way the flight controls are sitting, with one servo loading up.

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Thanks Ray.....we did...still pretty tight. On the other side of the issue I noticed there is a lot of slop, looseness in the connector right on the output end of all the servos, ( the part the tube is actually connect to...sorry for the lack of correct tech, part description ) It's the same all three servo so I assume it is normal. Why are those connections sooo loose / sloppy ?

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It's possible the bearing on the bellcrank was staked on too tight. I've seen that happen.

 

As far as the three bearings on the servo, it doesn't have to be tight, just staked enough to be in safety without any play in the bearing.

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Thanks again Ray. Now here is another issue, I started to get compressor stales when I roll up the tthrottle after doing practice hovering autos. Then to-day the torque gauge shows 40% at idle, then it may drop to 30% or stay at 40%. N1 / N2 and TOT are fine.

What is the likely cause of the compressor stale and is the torque gauge related?

Compressor stale doesn't seem to happen on a normal start and runup....just after the auto. At least not yet !! C20B

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Compressor stalls are air related, so as BAH suggested, check the air system lines.

 

Compressor wash.

 

Check bleed valve, make sure it isn't 'sticky'.

 

 

At 100% flat pitch on the ground, the torque should read around 30%. (This is a 'rule of thumb', and is not written anywhere.)

 

When you do your starts in the morning, I'm assuming you're doing your check to make sure the freewheel is disengaging. (Wrap the throttle to idle from 100% to make sure you're getting the split on your N2/Nr gauge.)

Freewheel issues are one thing that may give you fluctuating torque indications on auto-revs.

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Where is the filter on the particle seperator? The governor is a little slow and has trouble maintaining 100%. Any other reason for the compressor stall. FYI..flew to-day with no stall issue just the new problem with the torque gauge. Seems OK on the high side but the low end is reading incorrectly. 40% at idle is too high.

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