Today's Message Index:
----------------------
1. 06:56 AM - Re: Yak-50 MLG handle / valve (Bill)
2. 07:14 AM - Re: Yak-50 MLG handle / valve (John B)
3. 07:56 AM - Re: Yak-50 MLG handle / valve (Mark Bitterlich)
4. 08:12 AM - Re: Yak-50 MLG handle / valve (Mark Bitterlich)
5. 08:37 PM - Re: Yak-50 MLG handle / valve (apatton2)
Message 1
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| Subject: | Re: Yak-50 MLG handle / valve |
Phone number? My 50 did the same. Wamflight@gmail.com
Bill
> On Dec 1, 2024, at 01:43, apatton2 <apatton@alumni.princeton.edu> wrote:
>
>
> A question: how do you tell if your landing gear handle is going bad vs. actuator
seals failing?
>
> What I observe:
> Handle down - air is leaking through the handle. I can't tell which port of the
handle it's coming out of.
>
> Handle neutral - system is very tight. No audible leaks, and main tank will not
leak down (at least not very quickly - when turning air back on after 2h there
is almost no dip in the pressure gage).
>
> Handle up - (have only tested while flying so far) - system seems normal as pressure
builds to 50atm (I wouldn't say this is super rapid, so there may be leakage
in this position but the compressor is simply overcoming it).
>
> I suspect that the actuator seals themselves are going given how tight the neutral
position is... maybe that is the answer.
>
> I hope to be able to jack the plane soon to test things while it's on its gear.
> Thanks for any insight,
> Andrew
>
> --------
> Andrew Patton
> Yak-50
> San Francisco, CA
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=515050#515050
>
>
>
>
>
>
>
>
>
Message 2
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| Subject: | Re: Yak-50 MLG handle / valve |
817 701-9948, but call me tomorrow. I'm at work today...
Thank you!
John Bergeson
Rhome, Texas
On Sun, Dec 1, 2024 at 8:58=AFAM Bill <wamflight@gmail.com> wrote:
>
> Phone number? My 50 did the same. Wamflight@gmail.com
>
> Bill
>
> > On Dec 1, 2024, at 01:43, apatton2 <apatton@alumni.princeton.edu> wrote
:
> >
> apatton@alumni.princeton.edu>
> >
> > A question: how do you tell if your landing gear handle is going bad vs
.
> actuator seals failing?
> >
> > What I observe:
> > Handle down - air is leaking through the handle. I can't tell which por
t
> of the handle it's coming out of.
> >
> > Handle neutral - system is very tight. No audible leaks, and main tank
> will not leak down (at least not very quickly - when turning air back on
> after 2h there is almost no dip in the pressure gage).
> >
> > Handle up - (have only tested while flying so far) - system seems norma
l
> as pressure builds to 50atm (I wouldn't say this is super rapid, so there
> may be leakage in this position but the compressor is simply overcoming i
t).
> >
> > I suspect that the actuator seals themselves are going given how tight
> the neutral position is... maybe that is the answer.
> >
> > I hope to be able to jack the plane soon to test things while it's on
> its gear.
> > Thanks for any insight,
> > Andrew
> >
> > --------
> > Andrew Patton
> > Yak-50
> > San Francisco, CA
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=515050#515050
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
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>
>
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| Subject: | Yak-50 MLG handle / valve |
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| Subject: | Yak-50 MLG handle / valve |
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| Subject: | Re: Yak-50 MLG handle / valve |
Thanks - this is a very helpful response and your second message especially makes
a lot of sense to me. It brings to mind a few more questions:
1) What is the failure mode for the handle itself? If it leaks in neutral (after
the existing air pressure is vented), then it's a bad handle?
2) I recently was looking through a Yak-50 Maintenance Schedule doc. Seems like
the Russians recommend oiling the actuators with 15mL of oil every year, minimum:
> Through union bodies fill working chambers (retraction and extension) of undercarriage
jacks with 15-20 cm3
> of oil No. 6 (GOST 10957-61 standard).
Does anyone actually do this? I've been flying -50s since 2012 and hadn't heard
of regularly putting oil (in the West are we using air tool oil or something
else?)
--------
Andrew Patton
Yak-50
San Francisco, CA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=515055#515055
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