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To:  lml@lancaironline.net
Date: Mon, 03 Feb 2014 07:37:43 -0500
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From: PETER WILLIAMS <peterpawaviation@hotmail.com>
Subject: RE: [LML] Lancair IV main landing gear problems
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hii there

have you checked that the plane is sitting on the saddles and not loading u=
p the actuator
when on the ground?
this would put an undue load on the lock pin at the back of the actuator

peter

To: lml@lancaironline.net
Date: Sun=2C 2 Feb 2014 12:34:09 -0500
From: frederickemoreno@gmail.com
Subject: [LML] Lancair IV main landing gear problems

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Been scratching my head on this one=2C a mechanical intermittent problem th=
at happens occasionally=2C and happened again this morning.  Main landing g=
ear will not retract.  Nose gear goes up=2C not mains.  Recycle gear=2C eve=
rything retracts like a thing of beauty.  Months go by=2C no problem=2C the=
n it happens again. =0A=
 =0A=
Twice we have jacked the airplane up=2C carefully adjusted the rack and pin=
ion clearance and cylinder stroke positioning relative to the rack gear and=
 the plastic down stop=2C and yesterday it happened on take off.  Grrrrr.  =
Slow flight=2C 110 knots=2C cycle down=2C up=2C down=2C up=2C no problem.  =
Back to airport for total of 5 landings=2C no problem.   =0A=
 =0A=
This morning filled the cabin with pork=2C took off for a fly in breakfast=
=2C no problem with gear retraction=2C landed there with heavy braking to g=
et off the runway fast with an airplane behind us on short final=2C enjoy b=
reakfast=2C depart a couple of hours later=2C mains would not come up.  Grr=
rr.  Recycle=2C no problem=2C slick as custard in July.  =0A=
 =0A=
I have been working this problem with a fellow engineer with much experienc=
e in hydraulics . Current theory: Down lock pistons and pins constitute ass=
emblies in the hydraulic cylinders that may get jammed in position after ye=
ars of wear (estimate about a thousand landing cycles) and application of l=
arger than normal side loads on the locking pins from=2C for example=2C hea=
vy breaking.  Piston/pin assembly jams due to side load and wear=2C select =
gear up=2C piston does not rise due to jam=2C no hydraulic fluid can thus p=
ass to the main gear cylinder.  Cycle the gear=2C changing forces on the ma=
in gear pistons clears the jam with some wiggles and bangs as you recycle t=
he gear=2C raise gear=2C no problem. =0A=
 =0A=
Right now our plan is to order O-rings (requested o-ring kit or list of par=
t numbers for main gear from Lancair)=2C pull the cylinders and rack as an =
assembly out of the airplane=2C disassemble=2C inspect=2C look for scores=
=2C side load wear or whatever we can see.  We will deal with whatever we f=
ind.  While out in the boondocks of Western  Australia=2C the area is agric=
ultural with the regional center town nearby having a surprisingly large nu=
mber of hydraulics and machine shops due to all the ag machinery within a 2=
00 mile radius.  So we can probably get parts made=2C bore cylinders=2C mac=
hine inserts=2C or whatever.  =0A=
 =0A=
But all this assumes we have diagnosed the problem correctly. =0A=
 =0A=
We know you encounter problems waiting to raise gear due to air loads as th=
e airplane accelerates.  That is NOT the problem as it has occurred even ra=
ising the gear handle at 20 feet/95 knots shortly after rotation.   =0A=
 =0A=
Any insights=2C history=2C observations=2C advice or theories would be most=
 welcome.  =0A=
 =0A=
Head Scratching Fred Moreno=2C going bald=0A=
 		 	   		  =

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<body class=3D'hmmessage'><div dir=3D'ltr'>hii there<br><br>have you checke=
d that the plane is sitting on the saddles and not loading up the actuator<=
br>when on the ground?<br>this would put an undue load on the lock pin at t=
he back of the actuator<br><br>peter<br><br><div><hr id=3D"stopSpelling">To=
: lml@lancaironline.net<br>Date: Sun=2C 2 Feb 2014 12:34:09 -0500<br>From: =
frederickemoreno@gmail.com<br>Subject: [LML] Lancair IV main landing gear p=
roblems<br><br>=0A=
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<style><!--=0A=
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<table id=3D"ecxINCREDIMAINTABLE" background=3D"http://DF7D8768-D1FC-414D-8=
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=3BPADDING-TOP:20px=3BPADDING-LEFT:20px=3BPADDING-RIGHT:20px=3B" valign=3D"=
top">=0A=
<div id=3D"ecxINCREDI_TEXT_AREA" style=3D"PADDING-LEFT:2px=3B">=0A=
<div>Been scratching my head on this one=2C a mechanical intermittent probl=
em&nbsp=3Bthat happens occasionally=2C and happened again this morning.&nbs=
p=3B Main landing gear will not retract.&nbsp=3B Nose gear goes up=2C not m=
ains.&nbsp=3B Recycle gear=2C everything retracts like a thing of beauty.&n=
bsp=3B Months go by=2C no problem=2C then it happens again. </div>=0A=
<div>&nbsp=3B</div>=0A=
<div>Twice we have jacked the airplane up=2C carefully adjusted the rack an=
d pinion clearance and cylinder stroke positioning relative to the rack gea=
r and the plastic down stop=2C and yesterday it happened on take off.&nbsp=
=3B Grrrrr.&nbsp=3B Slow flight=2C 110 knots=2C cycle down=2C up=2C down=2C=
 up=2C no problem.&nbsp=3B Back to airport for total of 5 landings=2C no pr=
oblem.&nbsp=3B&nbsp=3B </div>=0A=
<div>&nbsp=3B</div>=0A=
<div>This morning filled the cabin with pork=2C took off for a fly in break=
fast=2C no problem with gear retraction=2C landed there with heavy braking =
to get off the runway fast with an airplane behind us on short final=2C enj=
oy breakfast=2C depart a couple of hours later=2C mains would not come up.&=
nbsp=3B Grrrr.&nbsp=3B Recycle=2C no problem=2C slick as custard in July. &=
nbsp=3B</div>=0A=
<div>&nbsp=3B</div>=0A=
<div>I have been working this problem with a fellow engineer with much expe=
rience in hydraulics . Current theory: Down lock pistons and pins constitut=
e assemblies in the hydraulic cylinders that may get jammed in position aft=
er years of wear (estimate about a thousand landing cycles) and application=
 of larger than normal side loads on the locking pins&nbsp=3Bfrom=2C for ex=
ample=2C heavy breaking.&nbsp=3B Piston/pin assembly jams due to side load =
and wear=2C select gear up=2C piston does not rise due to jam=2C no hydraul=
ic fluid can thus pass to the main gear cylinder.&nbsp=3B Cycle the gear=2C=
 changing forces on the main gear pistons clears the jam with some wiggles =
and bangs as you recycle the gear=2C raise gear=2C no problem. </div>=0A=
<div>&nbsp=3B</div>=0A=
<div>Right now our plan is to order O-rings (requested o-ring kit or list o=
f part numbers for main gear from Lancair)=2C pull the cylinders and rack a=
s an assembly out of the airplane=2C disassemble=2C inspect=2C look for sco=
res=2C side load wear or whatever we can see.&nbsp=3B We will deal with wha=
tever we find.&nbsp=3B While out in the boondocks of Western&nbsp=3B Austra=
lia=2C the area is agricultural with the regional center town nearby having=
 a surprisingly large number of hydraulics and machine shops due to all the=
 ag machinery within a 200 mile radius.&nbsp=3B So we can probably get part=
s made=2C bore cylinders=2C machine inserts=2C or whatever.&nbsp=3B </div>=
=0A=
<div>&nbsp=3B</div>=0A=
<div>But all this assumes we have diagnosed the problem correctly. </div>=
=0A=
<div>&nbsp=3B</div>=0A=
<div>We know you encounter problems waiting to raise gear due to air loads =
as the airplane accelerates.&nbsp=3B That is NOT the problem as it has occu=
rred even raising the gear handle at 20 feet/95 knots shortly after rotatio=
n.&nbsp=3B&nbsp=3B </div>=0A=
<div>&nbsp=3B</div>=0A=
<div>Any insights=2C history=2C observations=2C advice or theories would be=
 most welcome.&nbsp=3B </div>=0A=
<div>&nbsp=3B</div>=0A=
<div>Head Scratching Fred Moreno=2C going bald</div></div></td>=0A=
<td align=3D"right" valign=3D"bottom" width=3D"1"><img src=3D"cid:202E112F-=
C665-46C2-A8E6-51497E5AE937"></td></tr></tbody></table></div> 		 	   		  </=
div></body>
</html>=

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