M20c electric gear rigging

[Taracka]

Hello,

I am currently checking the rig on the nose gear on a 1969 electric gear M20C and the manual says to measure the bungee springs in the "static" and then "rigged" position and the difference should be .060. Could anyone clarify what they mean by static and rigged?

Thanks,

Rich

[cliffy]

As the nose gear goes into the over center position and locks down the springs on the retract rods compress.

When the nose gear is partially up the springs are at their fullest extension. The difference should be 060

allowing the springs to keep positive pressure on the overcenter link when down and locked.

[Guest]

Cliffy has the intereptation correct. You could also say free length to compressed length.

Clarence

[Taracka]

Thanks for the info. So I'm measuring a change of about .120 in the spring which means it is compressing more than the .060 the book calls for. Does anyone know if this measurement changes with temperature? It was about 80 in the hangar. I'd rather err on the side of having it a little too tight than loose and .120 is a little tight, in other words the bungee is compressing the spring a little more than it should be.

[N201MKTurbo]

As long as the spring coils never completely compress you are OK. If you completely compress the springs you will start bending tubes. If both springs are the same, adjust the down stop switch to get the correct compression.

[MB65E]

I had a bent nose retract tube, most likely from incorrect rigging. I don't think temps have anything to do with it. I'm sure it was hard over center vs the .060 measurement.

I'm glad your reading the manual at least!! It's easy to measure with a caliper. You could check it also by making sure the spring is not bottomed out. Lasar did have spare tubes/springs if needed. Also check for corrosion on the tops of the tubes where they pass thru the nose wheel bulkhead.

-Matt

[cliffy]

There is a tolerance on the compression length I think it runs 040 to 080 I'd need to look it up

Regardless it should be within that specified tolerance. Too much compression means too short rod.