Today's Message Index:
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1. 04:53 AM - Re: Procedure for Emerg gear extension YAK18T (A. Dennis Savarese)
2. 06:14 AM - Re: Procedure for Emerg gear extension YAK18T (andrewfeneley)
3. 06:26 AM - Re: Re: Procedure for Emerg gear extension YAK18T (doug sapp)
4. 06:26 AM - Re: Re: Procedure for Emerg gear extension YAK18T (A. Dennis Savarese)
5. 06:37 AM - Re: Re: Procedure for Emerg gear extension YAK18T (A. Dennis Savarese)
Message 1
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| Subject: | Re: Procedure for Emerg gear extension YAK18T |
I don't have a Yak 18T factory procedure, but I am pretty sure if you use t
he procedure I have on my web site for a Yak 52 and CJ6, you will find it w
ill eliminate the gear slamming down during the emergency gear extension.
- The only difference is you don't have to deal with operation from the r
ear cockpit.- So ignor anything related to the rear cockpit.- Go to htt
p://www.yak-52.com/maintena.htm.- Read through it first and then decide i
f you want to use it or not.- It is different from the procedure you are
using and has worked extremely well for probably 15+ years.=0ADennis=0A=0A
=0A________________________________=0A From: andrewfeneley <feneleyandrew@h
otmail.com>=0ATo: yak-list@matronics.com =0ASent: Tuesday, August 19, 2014
10:32 PM=0ASubject: Yak-List: Procedure for Emerg gear extension YAK18T=0A
l.com>=0A=0AEvery annual we test the emerg operation of the landing gear on
our Yak18T.- We test it using the following sequence; Close off the main
valve with the gear retracted, then drain the air from the system (using b
rake lever), then open the reserve tank, then move the UC lever to neutral
and the gear will retract. Mostly slamming down hard leg by leg and sometim
es the final leg will need the lever moved all the way to 'down' position t
o extend it. Question; Does anyone have the actual factory procedure? Is th
ere a method to 'buffer' the violent slamming down. I have thought about no
t draining the air from the system when switching from Main to Reserve and
testing it with a few cycles from the reserve bottle but the logic is that
this is not an accurate simulation but with no air in the system the extens
ion can be severe.- I'd like to be able to properly test the system to pr
ocedure while keeping the aeroplane on the jacks - it's not quite that seve
re but
I'm sure you all know w!=0Ahat I mean.=0A=0A--------=0AYak 18T Sydney VH-I
BT=0A=0A=0A=0A=0ARead this topic online here:=0A=0Ahttp://forums.matronics.
- - - - - - - - - - - - - - - -Matt Dralle, L
=======
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| Subject: | Re: Procedure for Emerg gear extension YAK18T |
Thanks Dennis, This procedure doesn't drain the air pre ext. this must help and
will use your procedure next annual. Thanks
--------
Yak 18T Sydney
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=428859#428859
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| Subject: | Re: Procedure for Emerg gear extension YAK18T |
Does the 18T have restrictors in the system like the CJ6?
Doug
On Wed, Aug 20, 2014 at 6:12 AM, andrewfeneley <feneleyandrew@hotmail.com>
wrote:
> >
>
> Thanks Dennis, This procedure doesn't drain the air pre ext. this must
> help and will use your procedure next annual. Thanks
>
> --------
> Yak 18T Sydney
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=428859#428859
>
>
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| Subject: | Re: Procedure for Emerg gear extension YAK18T |
That's correct because draining the air from the system as you were
doing eliminates the back pressure in the gear actuators which acts like
a "shock absorber" during gear extension. It will definitely work and
the gear will not slam down during the emergency gear extension test.
Just remember, once the system is filled(main air on) the lower the air
pressure in the system, the faster the gear will come down because there
is less back pressure. Any questions, don't hesitate to ask.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 8/20/2014 8:12 AM, andrewfeneley wrote:
>
> Thanks Dennis, This procedure doesn't drain the air pre ext. this must help
and will use your procedure next annual. Thanks
>
> --------
> Yak 18T Sydney
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=428859#428859
>
>
Message 5
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| Subject: | Re: Procedure for Emerg gear extension YAK18T |
But I don't think the emergency side has restrictors. The 52 isn't
suppose to have them on the emergency side, for obvious reasons. But
some people do put them in on the emergency side of the shuttle valves
to try and slow the gear extension down a bit. What many people don't
think about though is the fact that the opposite side air pressure in
the actuator (ie: the UP side) is the "shock absorber" during gear
extension. Soas the air pressure in the system goes down, gear extension
is more rapid. On jacks, the faster the gear comes down, the more
shaking the airplane does.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 8/20/2014 8:24 AM, doug sapp wrote:
> Does the 18T have restrictors in the system like the CJ6?
>
> Doug
>
>
> On Wed, Aug 20, 2014 at 6:12 AM, andrewfeneley
> <feneleyandrew@hotmail.com <mailto:feneleyandrew@hotmail.com>> wrote:
>
> <feneleyandrew@hotmail.com <mailto:feneleyandrew@hotmail.com>>
>
> Thanks Dennis, This procedure doesn't drain the air pre ext. this
> must help and will use your procedure next annual. Thanks
>
> --------
> Yak 18T Sydney
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=428859#428859
>
>
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