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To:  lml@lancaironline.net
Date: Wed, 09 Jun 2010 14:42:28 -0400
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Subject: LNC2 Landing Gear
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I believe that Scott is 100% on-point here.  You need to make sure that th=
e actuator is not pushing on the gear when fully extended -- the gear cyli=
nder must fully bottom out.  Same when retracted, although that's a little=
 more obvious since the wheel will be in the wrong spot.  Scott's approach=
 is good.  You pressurize the system and make sure that you can slip the=
 connecting bolt through.  I mention pressurized since the cylinders are=
 slightly longer when hydraulic pressure forces the rod to one end.  The=
 connection of the end plug to the barrel has some "give".  I did this and=
 had to remanufacture my spacer sleeves to make it all work.

One thing that was not mentioned, which I contributed to the ancient paper=
 LML which Jim and Linda Frantz administered before Marv, is that the nose=
 gear also needs to be able to swing freely when the gas strut and hydraul=
ic cylinders are disconnected.  The 320 has a bolt which pulls the nose st=
rut mounting blocks together, and there is a sleeve which goes over the bo=
lt to set the spacing between the blocks.  If the sleeve is too short, the=
 blocks are too close and there is too much pressure on the pivot bearings=
, creating friction which resists nose gear delpoyment.  The actuator can=
 push through this friction but the gas strut cannot.  The failure mode he=
re is a secondary extension mechanism that will not do its job.

- Rob Wolf


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<font color=3D'black' size=3D'2' face=3D'arial'>
<div>I believe that Scott is 100% on-point here.&nbsp; You need to make su=
re that the actuator is not pushing on the gear when fully extended -- the=
 gear cylinder must fully bottom out.&nbsp; Same when retracted, although=
 that's a little more obvious since the wheel will be in the wrong spot.&n=
bsp; Scott's approach is good.&nbsp; You pressurize the system and make su=
re that you can slip the connecting bolt through.&nbsp; I mention pressuri=
zed since the cylinders are slightly longer when hydraulic pressure forces=
 the rod to one end.&nbsp; The connection of the end plug to the barrel ha=
s some "give".&nbsp; I did this and had to remanufacture my spacer sleeves=
 to make it all work.</div>


<div>&nbsp;</div>


<div>One thing that was not mentioned, which I contributed to the ancient=
 paper LML which Jim and Linda Frantz administered before Marv, is that th=
e nose gear also needs to be able to swing freely when the gas strut and=
 hydraulic cylinders are disconnected.&nbsp; The 320 has a bolt which pull=
s the nose strut mounting blocks together, and there is a sleeve which goe=
s over the bolt to set the spacing between the blocks.&nbsp; If the sleeve=
 is too short, the blocks are too close and there&nbsp;is too much pressur=
e on the pivot bearings, creating friction which resists nose gear delpoym=
ent.&nbsp; The actuator can push through this friction but the gas strut=
 cannot.&nbsp; The failure mode here is a secondary extension mechanism th=
at will not do its job.<br>
</div>


<div>- Rob Wolf<br>
</div>


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