Today's Message Index:
----------------------
1. 04:32 AM - Re: Re: Gear problem Yak 50 (A. Dennis Savarese)
2. 04:48 AM - Re: Re: Gear problem Yak 50 (gord)
3. 04:55 AM - FW: Re: Gear problem Yak 50 (gord)
4. 05:27 AM - Re: Re: Gear problem Yak 50 (A. Dennis Savarese)
5. 05:35 AM - Re: FW: Re: Gear problem Yak 50 (A. Dennis Savarese)
6. 05:37 AM - Re: Re: Gear problem Yak 50 (A. Dennis Savarese)
7. 05:40 AM - Re: Gear problem Yak 50 (Vic)
8. 06:05 AM - Re: FW: Re: Gear problem Yak 50 (gord)
9. 08:29 AM - Re: FW: Re: Gear problem Yak 50 (A. Dennis Savarese)
10. 08:38 AM - Re: FW: Re: Gear problem Yak 50 (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
11. 08:54 AM - Re: FW: Re: Gear problem Yak 50 (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
12. 06:20 PM - Re: FW: Re: Gear problem Yak 50 (gord)
13. 06:57 PM - LED replacements for the gear and tail lights (mgdimarco)
14. 08:10 PM - Re: Yak 50 gear problem (Roger Kemp M.D.)
15. 08:35 PM - Re: Re: Gear problem Yak 50 (Roger Kemp M.D.)
16. 09:51 PM - Re: LED replacements for the gear and tail lights (Gary Gabbard)
Message 1
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| Subject: | Re: Gear problem Yak 50 |
If anyone is interested, here is a gear retraction/extension test
procedure that keeps the gear from slamming down when doing the
emergency gear extension test. Works for Yak 50's, 52's and CJ6's.
This procedure is on my web site, www.yak-52.com, on the home page.
- Before you perform this test, refill the main and emergency air bottles.
- With the airplane properly placed on the jacks, open the main air valve.
- Raise the gear using the front gear selector ie: move the gear
selector to the UP position.
- Confirm the gear is up and locked (confirm 2/3 red lights)
- TURN OFF the main air valve
- WITH THE GEAR SELECTOR STILL IN THE UP POSITION, open the emergency
air valve.
- The gear will most likely relax and some or all of the UP (red) lights
may go out.
- Now move the gear selector to the neutral position. The gear should go
down and lock.
- Confirm down and locked with 2/3 green lights.
- Turn off emergency air valve
- Squeeze the brake handle until all remaining air is depleted in the
system. No "wooshing" sound when the brake handle is squeezed and released.
(On Yak 52 W's and TW's, open the EMERGENCY AIR BLEED VALVE AT THE
REAR OF THE RIGHT SIDE CONSOLE)
- Move and confirm the gear selector is in the DOWN position. Move the
slide lock to the right.
- Open the main air valve
- Move the gear selector to the UP position and confirm you have 2/3 red
lights.
- Move the gear selector to the DOWN position and confirm you have 2/3
green lights.
- Turn the main air off.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 5/29/2012 12:54 AM, Jan Mevis wrote:
> --> Yak-List message posted by: Jan Mevis<jan.mevis@informavia.be>
>
> You can empty the emergency system by using the brakes, left, right,
> alternately, use the rudder.
> If there's some air left in the main system, the shuttle valve will
> ultimately pop back to the other side.
> Then do your gear tests on jacks. My guess is that you have some air loss
> on the line to the left actuator. Maybe a broken line.
> Anyway, if it has been a long time, then now is a good opportunity to
> overhaul the actuators?
>
> Jan
>
> On 29/05/12 03:43, "gord"<gord@thedampub.ca> wrote:
>
>> --> Yak-List message posted by: "gord"<gord@thedampub.ca>
>>
>> Thanks Vic.
>>
>> We will try that in the morning. Where is the shuttle valve located? I am
>> wondering why I had the retraction problem in the first place and then not
>> being able to get the gear down normally. Maybe the shuttle valve needs
>> cleaning? We will know more tomorrow.
>>
>> As I understand the schematic for the gear.... air goes from main tank
>> through the main air valve to the undercarriage lever where it is routed
>> to
>> either side of the undercarriage jack. Please correct me if this is wrong.
>>
>> Thank goodness for this forum! Gord
>>
>>
>>
>>
>>
>>
>>
>
>
Message 2
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| Subject: | Re: Gear problem Yak 50 |
We emptied the emerg tank. The main tank pressure is up but nothing works.
We set the parking brake and moved the rudder to try and use the air but
nothing. Looks like the shuttle valve is stuck. Where is the shuttle valve?
Does anyone have any pictures of the components? Thanks
Gord
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Jan Mevis
Sent: May-29-12 1:55 AM
Subject: Re: Yak-List: Re: Gear problem Yak 50
You can empty the emergency system by using the brakes, left, right,
alternately, use the rudder.
If there's some air left in the main system, the shuttle valve will
ultimately pop back to the other side.
Then do your gear tests on jacks. My guess is that you have some air loss
on the line to the left actuator. Maybe a broken line.
Anyway, if it has been a long time, then now is a good opportunity to
overhaul the actuators?
Jan
On 29/05/12 03:43, "gord" <gord@thedampub.ca> wrote:
>
>Thanks Vic.
>
>We will try that in the morning. Where is the shuttle valve located? I am
>wondering why I had the retraction problem in the first place and then not
>being able to get the gear down normally. Maybe the shuttle valve needs
>cleaning? We will know more tomorrow.
>
>As I understand the schematic for the gear.... air goes from main tank
>through the main air valve to the undercarriage lever where it is routed
>to
>either side of the undercarriage jack. Please correct me if this is wrong.
>
>Thank goodness for this forum! Gord
>
>
Message 3
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| Subject: | Re: Gear problem Yak 50 |
Questions from my mechanic Guy Doherty
-----Original Message-----
From: Guy Doherty [mailto:guysaircraft@bellnet.ca]
Sent: May-29-12 7:47 AM
Subject: Re: Yak-List: Re: Gear problem Yak 50
1. we have emptied the emergency tank completely by using hand brake
2. we closed the emergency valve
3. the main tank is full of air
4. the brakes do not work
how do we get the shuttle valve to move back?
how do we empty the main tank?
where is the shuttle valve?
how do we get the gear actuator out to inspect?
-----Original Message-----
From: gord
Sent: Tuesday, May 29, 2012 7:30 AM
Subject: RE: Yak-List: Re: Gear problem Yak 50
The emergency tank , we have to open it again, then by putting on the
parking brake and then using the rudder
-----Original Message-----
From: Guy Doherty [mailto:guysaircraft@bellnet.ca]
Sent: May-29-12 7:25 AM
Subject: Re: Yak-List: Re: Gear problem Yak 50
Gord / Vic,
Which tank do we empty the emergency or operator?
Guy
-----Original Message-----
From: gord
Sent: Monday, May 28, 2012 9:34 PM
Subject: FW: Yak-List: Re: Gear problem Yak 50
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Vic
Sent: May-28-12 8:41 PM
Subject: Yak-List: Re: Gear problem Yak 50
Hi Gord,
when you have activated the emergency system you wont be able to retract
the landing gear subsequently. Just empty the emergency tank completely,
close the tap and then do a refill to 50 bar and all should be working as
usual. Only with this procedure the rubber ball in the respective shuttle
valve will shift to the "normal" position.
Cheers
Vic
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=374120#374120
Message 4
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| Subject: | Re: Gear problem Yak 50 |
The shuttle valve's internal ball moves only with air pressure from
whatever side (main or emergency) applies pressure to the shuttle
valve. Let's look at the system with no pressure at all in either the
main or emergency bottles. None of the components in the pneumatic
system have any pressure on them. That includes the shuttle valves.
Now lets fill the main and emergency bottles. Still none of the
components have any pressure on them because we have not yet opened the
main air valve or emergency air valve.
Now lets open the main air valve. Air pressure is applied to all of the
components in the system including the gear 'lifts' through actuator
shuttle valves. Shuttle valves are only on the DOWN side of the
actuators. Why? Because there are two systems that have the capability
to extend the gear; the main system and the emergency system. When the
air pressure is placed on the shuttle valve, the ball inside the shuttle
valve is moved to the opposite side (internally) of the shuttle valve.
This blocks the air pressure from the emergency system from entering the
actuator. The ball stays in that position until the emergency air valve
is opened. But the ball will not move unless there is no air pressure
from the opposite side pressing against it.
Now with the airplane on jacks lets to do an emergency gear extension
test. To do this, we must first remove the pressure from the UP side of
the actuator. This is done by moving the gear selector to the neutral
position. That is the 'woosh' sound you hear when you move the gear
selector to neutral. Now there is no air pressure in the actuator and
no pressure from the main system on the shuttle valve. Open the
emergency air valve and the gear moves to the down position VERY hard.
What happened when you opened the emergency air valve was, air pressure
was sent to the shuttle valve moving the little ball inside to the
opposite side, thus blocking the main air side of the shuttle valve.
Now here's the main point of this discussion. If you don't remove the
pressure from the shuttle valve, the air pressure will hold the ball in
the position it is presently in and BLOCK any air from the main system
side from being able to retract the gear.
That is why we have to first deplete all the air from the system
components before we attempt to retract and extend the gear from the
main system side. We do this with the main and emergency air off and by
squeezing the brake handle and if equipped, moving the flaps, until
there is no air left in the system. No 'woosh' sound when the brake
handle is released. Then when you open the main air valve, the shuttle
valve moves back into the 'normal' position, blocking the emergency side
of the shuttle valve. Now the gear should retract and extend normally.
Hope this helps.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 5/29/2012 12:54 AM, Jan Mevis wrote:
> --> Yak-List message posted by: Jan Mevis<jan.mevis@informavia.be>
>
> You can empty the emergency system by using the brakes, left, right,
> alternately, use the rudder.
> If there's some air left in the main system, the shuttle valve will
> ultimately pop back to the other side.
> Then do your gear tests on jacks. My guess is that you have some air loss
> on the line to the left actuator. Maybe a broken line.
> Anyway, if it has been a long time, then now is a good opportunity to
> overhaul the actuators?
>
> Jan
>
> On 29/05/12 03:43, "gord"<gord@thedampub.ca> wrote:
>
>> --> Yak-List message posted by: "gord"<gord@thedampub.ca>
>>
>> Thanks Vic.
>>
>> We will try that in the morning. Where is the shuttle valve located? I am
>> wondering why I had the retraction problem in the first place and then not
>> being able to get the gear down normally. Maybe the shuttle valve needs
>> cleaning? We will know more tomorrow.
>>
>> As I understand the schematic for the gear.... air goes from main tank
>> through the main air valve to the undercarriage lever where it is routed
>> to
>> either side of the undercarriage jack. Please correct me if this is wrong.
>>
>> Thank goodness for this forum! Gord
>>
>>
>>
>>
>>
>>
>>
>
>
Message 5
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| Subject: | Re: Gear problem Yak 50 |
Answers to your questions:
1: you can't empty the emergency tank with the hand brake. To empty the
emergency tank you will have to loosen the B nut on the top of the
tank. The only reason to empty the emergency air tank would be to
remove any pressure from the shuttle valves.
4: the brakes will not operate unless you open the main air valve. Once
the main air valve is open, the brakes should work properly.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 5/29/2012 6:53 AM, gord wrote:
> --> Yak-List message posted by: "gord"<gord@thedampub.ca>
>
> Questions from my mechanic Guy Doherty
>
> -----Original Message-----
> From: Guy Doherty [mailto:guysaircraft@bellnet.ca]
> Sent: May-29-12 7:47 AM
> To: gord@thedampub.ca
> Subject: Re: Yak-List: Re: Gear problem Yak 50
>
> 1. we have emptied the emergency tank completely by using hand brake
> 2. we closed the emergency valve
> 3. the main tank is full of air
> 4. the brakes do not work
>
> how do we get the shuttle valve to move back?
> how do we empty the main tank?
> where is the shuttle valve?
> how do we get the gear actuator out to inspect?
>
>
> -----Original Message-----
> From: gord
> Sent: Tuesday, May 29, 2012 7:30 AM
> To: 'Guy Doherty'
> Subject: RE: Yak-List: Re: Gear problem Yak 50
>
> The emergency tank , we have to open it again, then by putting on the
> parking brake and then using the rudder
>
> -----Original Message-----
> From: Guy Doherty [mailto:guysaircraft@bellnet.ca]
> Sent: May-29-12 7:25 AM
> To: gord@thedampub.ca; vicmolnar@aol.com
> Subject: Re: Yak-List: Re: Gear problem Yak 50
>
> Gord / Vic,
>
> Which tank do we empty the emergency or operator?
>
> Guy
>
> -----Original Message-----
> From: gord
> Sent: Monday, May 28, 2012 9:34 PM
> To: 'Guy Doherty'
> Subject: FW: Yak-List: Re: Gear problem Yak 50
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Vic
> Sent: May-28-12 8:41 PM
> To: yak-list@matronics.com
> Subject: Yak-List: Re: Gear problem Yak 50
>
> --> Yak-List message posted by: "Vic"<vicmolnar@aol.com>
>
> Hi Gord,
>
> when you have activated the emergency system you wont be able to retract
> the landing gear subsequently. Just empty the emergency tank completely,
> close the tap and then do a refill to 50 bar and all should be working as
> usual. Only with this procedure the rubber ball in the respective shuttle
> valve will shift to the "normal" position.
>
> Cheers
> Vic
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=374120#374120
>
>
Message 6
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| Subject: | Re: Gear problem Yak 50 |
Gord,
Did you try squeezing the brake handle until there was no air or 'woosh'
when the brake handle is released. Do this with both the main and
emergency air valves off. With the valves off what you are doing when
you squeeze the brake handle until no more 'woosh' is heard, is using up
all the air in the system (not the bottles). This relieves the pressure
on the shuttle valves.
There is a shuttle valve for each of the actuators. Thus, 2 of them.
Look at the top of the gear actuator. This is the end opposite the
chrome shaft that moves in and out to retract and extend the gear. The
is the DOWN end of the actuator. Look for a line or small component in
the line either on or close to the actuator. This is the shuttle valve.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 5/29/2012 6:45 AM, gord wrote:
> --> Yak-List message posted by: "gord"<gord@thedampub.ca>
>
> We emptied the emerg tank. The main tank pressure is up but nothing works.
> We set the parking brake and moved the rudder to try and use the air but
> nothing. Looks like the shuttle valve is stuck. Where is the shuttle valve?
> Does anyone have any pictures of the components? Thanks
>
> Gord
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Jan Mevis
> Sent: May-29-12 1:55 AM
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Re: Gear problem Yak 50
>
> --> Yak-List message posted by: Jan Mevis<jan.mevis@informavia.be>
>
> You can empty the emergency system by using the brakes, left, right,
> alternately, use the rudder.
> If there's some air left in the main system, the shuttle valve will
> ultimately pop back to the other side.
> Then do your gear tests on jacks. My guess is that you have some air loss
> on the line to the left actuator. Maybe a broken line.
> Anyway, if it has been a long time, then now is a good opportunity to
> overhaul the actuators?
>
> Jan
>
> On 29/05/12 03:43, "gord"<gord@thedampub.ca> wrote:
>
>> --> Yak-List message posted by: "gord"<gord@thedampub.ca>
>>
>> Thanks Vic.
>>
>> We will try that in the morning. Where is the shuttle valve located? I am
>> wondering why I had the retraction problem in the first place and then not
>> being able to get the gear down normally. Maybe the shuttle valve needs
>> cleaning? We will know more tomorrow.
>>
>> As I understand the schematic for the gear.... air goes from main tank
>> through the main air valve to the undercarriage lever where it is routed
>> to
>> either side of the undercarriage jack. Please correct me if this is wrong.
>>
>> Thank goodness for this forum! Gord
>>
>>
>>
>>
>>
>>
>>
>
>
Message 7
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| Subject: | Re: Gear problem Yak 50 |
Hello,
the shuttle valves are mounted on the gear actuators, see photo. Dennis explained
the logics in the system perfectly.
Vic
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=374152#374152
Attachments:
http://forums.matronics.com//files/p1040443_165.jpg
Message 8
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| Subject: | Re: Gear problem Yak 50 |
Dennis We did empty the emergency tank with the hand brake. The main air
valve was open. Could that be part of the problem?
Gord
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis Savarese
Sent: May-29-12 8:31 AM
Subject: Re: FW: Yak-List: Re: Gear problem Yak 50
<dsavarese0812@bellsouth.net>
Answers to your questions:
1: you can't empty the emergency tank with the hand brake. To empty the
emergency tank you will have to loosen the B nut on the top of the
tank. The only reason to empty the emergency air tank would be to
remove any pressure from the shuttle valves.
4: the brakes will not operate unless you open the main air valve. Once
the main air valve is open, the brakes should work properly.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 5/29/2012 6:53 AM, gord wrote:
> --> Yak-List message posted by: "gord"<gord@thedampub.ca>
>
> Questions from my mechanic Guy Doherty
>
> -----Original Message-----
> From: Guy Doherty [mailto:guysaircraft@bellnet.ca]
> Sent: May-29-12 7:47 AM
> To: gord@thedampub.ca
> Subject: Re: Yak-List: Re: Gear problem Yak 50
>
> 1. we have emptied the emergency tank completely by using hand brake
> 2. we closed the emergency valve
> 3. the main tank is full of air
> 4. the brakes do not work
>
> how do we get the shuttle valve to move back?
> how do we empty the main tank?
> where is the shuttle valve?
> how do we get the gear actuator out to inspect?
>
>
> -----Original Message-----
> From: gord
> Sent: Tuesday, May 29, 2012 7:30 AM
> To: 'Guy Doherty'
> Subject: RE: Yak-List: Re: Gear problem Yak 50
>
> The emergency tank , we have to open it again, then by putting on the
> parking brake and then using the rudder
>
> -----Original Message-----
> From: Guy Doherty [mailto:guysaircraft@bellnet.ca]
> Sent: May-29-12 7:25 AM
> To: gord@thedampub.ca; vicmolnar@aol.com
> Subject: Re: Yak-List: Re: Gear problem Yak 50
>
> Gord / Vic,
>
> Which tank do we empty the emergency or operator?
>
> Guy
>
> -----Original Message-----
> From: gord
> Sent: Monday, May 28, 2012 9:34 PM
> To: 'Guy Doherty'
> Subject: FW: Yak-List: Re: Gear problem Yak 50
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Vic
> Sent: May-28-12 8:41 PM
> To: yak-list@matronics.com
> Subject: Yak-List: Re: Gear problem Yak 50
>
> --> Yak-List message posted by: "Vic"<vicmolnar@aol.com>
>
> Hi Gord,
>
> when you have activated the emergency system you wont be able to retract
> the landing gear subsequently. Just empty the emergency tank completely,
> close the tap and then do a refill to 50 bar and all should be working as
> usual. Only with this procedure the rubber ball in the respective shuttle
> valve will shift to the "normal" position.
>
> Cheers
> Vic
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=374120#374120
>
>
Message 9
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| Subject: | Re: Gear problem Yak 50 |
The only way you can empty the emergency tank with the hand brake is to
have the emergency air valve open while you are squeezing the brake handle.
Go back to what we discussed on the phone and start from there. Then
let me know what happens.
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 5/29/2012 8:00 AM, gord wrote:
> --> Yak-List message posted by: "gord"<gord@thedampub.ca>
>
> Dennis We did empty the emergency tank with the hand brake. The main air
> valve was open. Could that be part of the problem?
>
> Gord
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis Savarese
> Sent: May-29-12 8:31 AM
> To: yak-list@matronics.com
> Subject: Re: FW: Yak-List: Re: Gear problem Yak 50
>
> --> Yak-List message posted by: "A. Dennis Savarese"
> <dsavarese0812@bellsouth.net>
>
> Answers to your questions:
> 1: you can't empty the emergency tank with the hand brake. To empty the
> emergency tank you will have to loosen the B nut on the top of the
> tank. The only reason to empty the emergency air tank would be to
> remove any pressure from the shuttle valves.
> 4: the brakes will not operate unless you open the main air valve. Once
> the main air valve is open, the brakes should work properly.
> Dennis
>
> A. Dennis Savarese
> 334-285-6263
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>
>
> On 5/29/2012 6:53 AM, gord wrote:
>> --> Yak-List message posted by: "gord"<gord@thedampub.ca>
>>
>> Questions from my mechanic Guy Doherty
>>
>> -----Original Message-----
>> From: Guy Doherty [mailto:guysaircraft@bellnet.ca]
>> Sent: May-29-12 7:47 AM
>> To: gord@thedampub.ca
>> Subject: Re: Yak-List: Re: Gear problem Yak 50
>>
>> 1. we have emptied the emergency tank completely by using hand brake
>> 2. we closed the emergency valve
>> 3. the main tank is full of air
>> 4. the brakes do not work
>>
>> how do we get the shuttle valve to move back?
>> how do we empty the main tank?
>> where is the shuttle valve?
>> how do we get the gear actuator out to inspect?
>>
>>
>>
>>
>> -----Original Message-----
>> From: gord
>> Sent: Tuesday, May 29, 2012 7:30 AM
>> To: 'Guy Doherty'
>> Subject: RE: Yak-List: Re: Gear problem Yak 50
>>
>> The emergency tank , we have to open it again, then by putting on the
>> parking brake and then using the rudder
>>
>> -----Original Message-----
>> From: Guy Doherty [mailto:guysaircraft@bellnet.ca]
>> Sent: May-29-12 7:25 AM
>> To: gord@thedampub.ca; vicmolnar@aol.com
>> Subject: Re: Yak-List: Re: Gear problem Yak 50
>>
>> Gord / Vic,
>>
>> Which tank do we empty the emergency or operator?
>>
>> Guy
>>
>> -----Original Message-----
>> From: gord
>> Sent: Monday, May 28, 2012 9:34 PM
>> To: 'Guy Doherty'
>> Subject: FW: Yak-List: Re: Gear problem Yak 50
>>
>>
>>
>> -----Original Message-----
>> From: owner-yak-list-server@matronics.com
>> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Vic
>> Sent: May-28-12 8:41 PM
>> To: yak-list@matronics.com
>> Subject: Yak-List: Re: Gear problem Yak 50
>>
>> --> Yak-List message posted by: "Vic"<vicmolnar@aol.com>
>>
>> Hi Gord,
>>
>> when you have activated the emergency system you wont be able to retract
>> the landing gear subsequently. Just empty the emergency tank completely,
>> close the tap and then do a refill to 50 bar and all should be working as
>> usual. Only with this procedure the rubber ball in the respective shuttle
>> valve will shift to the "normal" position.
>>
>> Cheers
>> Vic
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=374120#374120
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
Message 10
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| Subject: | Re: Gear problem Yak 50 |
Gord,
If you left the main air valve and the emergency air valve open at the same time,
then you obviously ran the air out of both systems.
The YAK-50 is unlike the 52 in that when you go to refill the air from the external
air fitting on the left side just aft of the canopy, it will fill both tanks
(emergency and main) at the same time.
Bottom line, if you used the emergency system, you need to reset the shuttle valves.
No way around that.
There are two shuttle valves, one for each landing gear actuator. You obtain access
to them by taking off an access/inspection panel on the bottom of the wing
forward of the hole that the tires go into when the gear comes up. You can
see the REAR of the actuator by looking inside of the gear well where the tires
go up into. That end will have one hose hooked to it, and it is used to RAISE
the gear. You are looking for the FORWARD end of that actuator and the access
panel is on the BOTTOM of the aircraft.
There are not too many panels to take off around that area, so just keep taking
them off until you find the right one.
You will KNOW that when you look up and see two black hoses connected to a "T"
fitting that is in turn screwed up into the actual gear actuator itself.
One of those hoses comes from the MAIN bottle. Pressure is fed to it when the
gear handle is down and the main air valve is open.
The OTHER hose comes directly from the emergency bottle. I can't remember for
sure, but I seem to think the forward hose is from the emergency bottle, but DO
NOT QUOTE ME ON THAT! I HONESTLY DO NOT REMEMBER! Just something in my head
says it might be the front one.
Jan has WARNED you correctly that if you take off the hose fitting that comes from
the MAIN BOTTLE that there will be a little tiny cone shaped washer that will
fall out and go rolling away into places unknown if you are not very very
careful. This is a flow restrictor and you sure as blazes do not want to LOSE
THAT! BE CAREFUL!
In any case, since you are having so much trouble here, I suggest this procedure.
After you find and take off the inspection panel for the forward end of the gear
actuator, and find the forward air fittings on the bottom where the two hoses
come in. Figure out which one of them comes from the EMERGENCY BOTTLE. You
want to loosen that one so it is almost coming off. Do that to both sides...
both actuators.
Just to make sure you have the right ones loose, do this:
First, I assume the gear is DOWN and the aircraft is securely on jacks.
Turn off main and emergency hand valves in the cockpit. Using the external air
filling port, fill the air to about 2 on the gage.
Put the gear handle in the MIDDLE position. Not UP, not DOWN.... MIDDLE!
Now just barely crack the emergency gear valve on the right side of the cockpit
control panel. You should hear air hissing out the loose fittings on each gear
leg. CHECK THAT! Make sure that air is leaking out of BOTH of these fittings.
Now close the emergency gear valve. The air will stop coming out of the loose
fittings.
Now put the gear handle in the DOWN position.
Using the external air fill port, fill aircraft air to 5 on the gage (50 BARS).
Do this SLOWLY. You will see both EMERGENCY and MAIN bottle filling up at the
same time. This is normal.
Now open the MAIN air valve.
Cycle the gear handle up.
The gear should come up. All the way. If it is a little slow doing so the FIRST
time, do not worry.
If there are no air leaks, tighten up the two loose fittings, safety wire them
both (not easy by the way) and now cycle your landing gear normally a few times.
When you are all done with this, raise the gear and LISTEN FOR ANY AIR HISSING
OUT OF THE GEAR ACTUATOR LEVER IN THE COCKPIT. If you hear air coming out of
the gear handle in the cockpit with the gear either UP or the gear DOWN, then
you have an internal seal in the gear actuator itself that is leaking.
If that happens, the next step is figuring out which one is doing it... but we'll
save on that until it becomes necessary, which hopefully it will not.
You asked how to take out the actuators. Answer: IT IS NOT EASY! Go to the
saved messages in the YAK list and do a search. You will come up with several
answers. Feel free to ask questions about which one you want to follow.
The ALTERNATE procedure is to:
1. Have aircraft on jacks. Gear down and selected down. Both Emergency and Main
gages read full.
2. Close BOTH main and emergency air valves.
3. Open ONLY THE EMERGENCY AIR VALVE. LEAVE THE MAIN VALVE CLOSED!
4. Cycle brakes until all the air is gone.
5. LEAVE EMERGENCY AIR VALVE OPEN.
6. Open MAIN AIR VALVE
7. Cycle Landing gear up and down two or three times.
8. CLOSE EMERGENCY AIR VALVE.
9. Refill system from external fill port to 5 on the gage (50 BAR) MAIN VALVE
IS STILL OPEN
10. Cycle gear normally. Listen for air leaking in gear handle with gear up and
with gear down.
Mark Bitterlich
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of gord
Sent: Tuesday, May 29, 2012 9:00 AM
Subject: RE: FW: Yak-List: Re: Gear problem Yak 50
Dennis We did empty the emergency tank with the hand brake. The main air
valve was open. Could that be part of the problem?
Gord
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis Savarese
Sent: May-29-12 8:31 AM
Subject: Re: FW: Yak-List: Re: Gear problem Yak 50
<dsavarese0812@bellsouth.net>
Answers to your questions:
1: you can't empty the emergency tank with the hand brake. To empty the
emergency tank you will have to loosen the B nut on the top of the
tank. The only reason to empty the emergency air tank would be to
remove any pressure from the shuttle valves.
4: the brakes will not operate unless you open the main air valve. Once
the main air valve is open, the brakes should work properly.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 5/29/2012 6:53 AM, gord wrote:
> --> Yak-List message posted by: "gord"<gord@thedampub.ca>
>
> Questions from my mechanic Guy Doherty
>
> -----Original Message-----
> From: Guy Doherty [mailto:guysaircraft@bellnet.ca]
> Sent: May-29-12 7:47 AM
> To: gord@thedampub.ca
> Subject: Re: Yak-List: Re: Gear problem Yak 50
>
> 1. we have emptied the emergency tank completely by using hand brake
> 2. we closed the emergency valve
> 3. the main tank is full of air
> 4. the brakes do not work
>
> how do we get the shuttle valve to move back?
> how do we empty the main tank?
> where is the shuttle valve?
> how do we get the gear actuator out to inspect?
>
>
> -----Original Message-----
> From: gord
> Sent: Tuesday, May 29, 2012 7:30 AM
> To: 'Guy Doherty'
> Subject: RE: Yak-List: Re: Gear problem Yak 50
>
> The emergency tank , we have to open it again, then by putting on the
> parking brake and then using the rudder
>
> -----Original Message-----
> From: Guy Doherty [mailto:guysaircraft@bellnet.ca]
> Sent: May-29-12 7:25 AM
> To: gord@thedampub.ca; vicmolnar@aol.com
> Subject: Re: Yak-List: Re: Gear problem Yak 50
>
> Gord / Vic,
>
> Which tank do we empty the emergency or operator?
>
> Guy
>
> -----Original Message-----
> From: gord
> Sent: Monday, May 28, 2012 9:34 PM
> To: 'Guy Doherty'
> Subject: FW: Yak-List: Re: Gear problem Yak 50
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Vic
> Sent: May-28-12 8:41 PM
> To: yak-list@matronics.com
> Subject: Yak-List: Re: Gear problem Yak 50
>
> --> Yak-List message posted by: "Vic"<vicmolnar@aol.com>
>
> Hi Gord,
>
> when you have activated the emergency system you wont be able to retract
> the landing gear subsequently. Just empty the emergency tank completely,
> close the tap and then do a refill to 50 bar and all should be working as
> usual. Only with this procedure the rubber ball in the respective shuttle
> valve will shift to the "normal" position.
>
> Cheers
> Vic
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=374120#374120
>
>
Message 11
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| Subject: | Re: Gear problem Yak 50 |
One error in my posting.
The 50 and the 52 both fill the emergency and main bottles from the
external fill port.
Where they differ is when the engine is running.
The 50 fills both emergency and main tanks from the engine air
compressor.
The 52 only fills the MAIN air bottle from the engine air compressor.
I always manage to screw that up somehow... sorry.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Bitterlich,
Mark G CIV Det Cherry Point, MALS-14 64E
Sent: Tuesday, May 29, 2012 11:35 AM
Subject: RE: FW: Yak-List: Re: Gear problem Yak 50
Point, MALS-14 64E" <mark.bitterlich@navy.mil>
Gord,
If you left the main air valve and the emergency air valve open at the
same time, then you obviously ran the air out of both systems.
The YAK-50 is unlike the 52 in that when you go to refill the air from
the external air fitting on the left side just aft of the canopy, it
will fill both tanks (emergency and main) at the same time.
Message 12
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|
| Subject: | Re: Gear problem Yak 50 |
Thanks for all the help Dennis. We followed your advice and the gear
operates perfectly. It appears that the problem was self induced for I
cannot remember turning the air valve on yesterday. It is a bit insidious
because the pressure indicates all is OK, the engine starts and the brakes
work.. even with the air off. So within the space of 24 hours or so, with
the help of this forum, we solved the problem, figured out who/what caused
it and have taken some measures to make sure it doesn't happen again. I
look forward to seeing you in August when you come to Owen Sound to give us
a ground school on the Yak 50. I think this is the only way to fly this
beautiful airplane with confidence. It was a good day and while we had it
on jacks we changed the tires ... another learning experience. Gord
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis Savarese
Sent: May-29-12 11:27 AM
Subject: Re: FW: Yak-List: Re: Gear problem Yak 50
<dsavarese0812@bellsouth.net>
The only way you can empty the emergency tank with the hand brake is to
have the emergency air valve open while you are squeezing the brake handle.
Go back to what we discussed on the phone and start from there. Then
let me know what happens.
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 5/29/2012 8:00 AM, gord wrote:
> --> Yak-List message posted by: "gord"<gord@thedampub.ca>
>
> Dennis We did empty the emergency tank with the hand brake. The main air
> valve was open. Could that be part of the problem?
>
> Gord
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis
Savarese
> Sent: May-29-12 8:31 AM
> To: yak-list@matronics.com
> Subject: Re: FW: Yak-List: Re: Gear problem Yak 50
>
> --> Yak-List message posted by: "A. Dennis Savarese"
> <dsavarese0812@bellsouth.net>
>
> Answers to your questions:
> 1: you can't empty the emergency tank with the hand brake. To empty the
> emergency tank you will have to loosen the B nut on the top of the
> tank. The only reason to empty the emergency air tank would be to
> remove any pressure from the shuttle valves.
> 4: the brakes will not operate unless you open the main air valve. Once
> the main air valve is open, the brakes should work properly.
> Dennis
>
> A. Dennis Savarese
> 334-285-6263
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>
>
> On 5/29/2012 6:53 AM, gord wrote:
>> --> Yak-List message posted by: "gord"<gord@thedampub.ca>
>>
>> Questions from my mechanic Guy Doherty
>>
>> -----Original Message-----
>> From: Guy Doherty [mailto:guysaircraft@bellnet.ca]
>> Sent: May-29-12 7:47 AM
>> To: gord@thedampub.ca
>> Subject: Re: Yak-List: Re: Gear problem Yak 50
>>
>> 1. we have emptied the emergency tank completely by using hand brake
>> 2. we closed the emergency valve
>> 3. the main tank is full of air
>> 4. the brakes do not work
>>
>> how do we get the shuttle valve to move back?
>> how do we empty the main tank?
>> where is the shuttle valve?
>> how do we get the gear actuator out to inspect?
>>
>>
>>
>>
>> -----Original Message-----
>> From: gord
>> Sent: Tuesday, May 29, 2012 7:30 AM
>> To: 'Guy Doherty'
>> Subject: RE: Yak-List: Re: Gear problem Yak 50
>>
>> The emergency tank , we have to open it again, then by putting on the
>> parking brake and then using the rudder
>>
>> -----Original Message-----
>> From: Guy Doherty [mailto:guysaircraft@bellnet.ca]
>> Sent: May-29-12 7:25 AM
>> To: gord@thedampub.ca; vicmolnar@aol.com
>> Subject: Re: Yak-List: Re: Gear problem Yak 50
>>
>> Gord / Vic,
>>
>> Which tank do we empty the emergency or operator?
>>
>> Guy
>>
>> -----Original Message-----
>> From: gord
>> Sent: Monday, May 28, 2012 9:34 PM
>> To: 'Guy Doherty'
>> Subject: FW: Yak-List: Re: Gear problem Yak 50
>>
>>
>>
>> -----Original Message-----
>> From: owner-yak-list-server@matronics.com
>> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Vic
>> Sent: May-28-12 8:41 PM
>> To: yak-list@matronics.com
>> Subject: Yak-List: Re: Gear problem Yak 50
>>
>> --> Yak-List message posted by: "Vic"<vicmolnar@aol.com>
>>
>> Hi Gord,
>>
>> when you have activated the emergency system you wont be able to
retract
>> the landing gear subsequently. Just empty the emergency tank completely,
>> close the tap and then do a refill to 50 bar and all should be working as
>> usual. Only with this procedure the rubber ball in the respective shuttle
>> valve will shift to the "normal" position.
>>
>> Cheers
>> Vic
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=374120#374120
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
Message 13
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| Subject: | LED replacements for the gear and tail lights |
I am able to acquire LED replacements for the GE304s used in the CJ-6 (and presumably
Yak) gear and tail lights. Here are some photos. I'll be happy to order
a pile of these if there is sufficient interest.
As a heads up, the two contacts on the bottom require some trimming due to the
springs on the poles in the sockets.
--------
Michael Di Marco
China Blue
mgdimarco@yahoo.com
407-608-3290
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=374230#374230
Attachments:
http://forums.matronics.com//files/img_0245_140.jpg
http://forums.matronics.com//files/img_0242_147.jpg
http://forums.matronics.com//files/img_0241_118.jpg
Message 14
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|
| Subject: | Re: Yak 50 gear problem |
V2FzIHRoZSBtYWluIGFpciB0dXJuZWQgb24/IFRoZSBhaXIga25vYiBpbiB0aGUgY2FuIGJlIGNs
b3NlZCB3aXRoIHlvdSBiZWluZyBhYmxlIHRvIHN0YXJ0LCB0YXhpLCBhbmQgdGFrZSBvZmYgYmVm
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G2YNCg=
Message 15
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|
| Subject: | Re: Gear problem Yak 50 |
Sorry for the comment about turning the air on as a cause of a floppy gear lever
and a gear hanging after putting G on the aircraft. I was clearing my email
by going from the oldest to the newest after being off grid for the Holliday.
You are absolutely right. She will get you airborne before you figure out that
you forgot to turn the system air knob counter clock to open it. Since the "parrot
hooks" are spring loaded not compressed air driven like the 52 the gear
are keep retracted by air pressure the up shuttle cock on the actuators.
Nothing like having you IP giving you your checkout turn the air off as you are
picking your new to you 50 up in Arkansas. I'm laughing now 5 years later but
that ditch on the other side of the runway was looking awfully menacing with
fading brakes on T.O. Just proved to me that once again an incident or an accident
is composed of a series of small events that lead to the final big event.
Doc
Sent from my iPad
On May 29, 2012, at 8:17 PM, "gord" <gord@thedampub.ca> wrote:
>
> Thanks for all the help Dennis. We followed your advice and the gear
> operates perfectly. It appears that the problem was self induced for I
> cannot remember turning the air valve on yesterday. It is a bit insidious
> because the pressure indicates all is OK, the engine starts and the brakes
> work.. even with the air off. So within the space of 24 hours or so, with
> the help of this forum, we solved the problem, figured out who/what caused
> it and have taken some measures to make sure it doesn't happen again. I
> look forward to seeing you in August when you come to Owen Sound to give us
> a ground school on the Yak 50. I think this is the only way to fly this
> beautiful airplane with confidence. It was a good day and while we had it
> on jacks we changed the tires ... another learning experience. Gord
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis Savarese
> Sent: May-29-12 11:27 AM
> To: yak-list@matronics.com
> Subject: Re: FW: Yak-List: Re: Gear problem Yak 50
>
> <dsavarese0812@bellsouth.net>
>
> The only way you can empty the emergency tank with the hand brake is to
> have the emergency air valve open while you are squeezing the brake handle.
>
> Go back to what we discussed on the phone and start from there. Then
> let me know what happens.
>
> A. Dennis Savarese
> 334-285-6263
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>
>
> On 5/29/2012 8:00 AM, gord wrote:
>> --> Yak-List message posted by: "gord"<gord@thedampub.ca>
>>
>> Dennis We did empty the emergency tank with the hand brake. The main air
>> valve was open. Could that be part of the problem?
>>
>> Gord
>>
>> -----Original Message-----
>> From: owner-yak-list-server@matronics.com
>> [mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis
> Savarese
>> Sent: May-29-12 8:31 AM
>> To: yak-list@matronics.com
>> Subject: Re: FW: Yak-List: Re: Gear problem Yak 50
>>
>> --> Yak-List message posted by: "A. Dennis Savarese"
>> <dsavarese0812@bellsouth.net>
>>
>> Answers to your questions:
>> 1: you can't empty the emergency tank with the hand brake. To empty the
>> emergency tank you will have to loosen the B nut on the top of the
>> tank. The only reason to empty the emergency air tank would be to
>> remove any pressure from the shuttle valves.
>> 4: the brakes will not operate unless you open the main air valve. Once
>> the main air valve is open, the brakes should work properly.
>> Dennis
>>
>> A. Dennis Savarese
>> 334-285-6263
>> 334-546-8182 (mobile)
>> www.yak-52.com
>> Skype - Yakguy1
>>
>>
>> On 5/29/2012 6:53 AM, gord wrote:
>>> --> Yak-List message posted by: "gord"<gord@thedampub.ca>
>>>
>>> Questions from my mechanic Guy Doherty
>>>
>>> -----Original Message-----
>>> From: Guy Doherty [mailto:guysaircraft@bellnet.ca]
>>> Sent: May-29-12 7:47 AM
>>> To: gord@thedampub.ca
>>> Subject: Re: Yak-List: Re: Gear problem Yak 50
>>>
>>> 1. we have emptied the emergency tank completely by using hand brake
>>> 2. we closed the emergency valve
>>> 3. the main tank is full of air
>>> 4. the brakes do not work
>>>
>>> how do we get the shuttle valve to move back?
>>> how do we empty the main tank?
>>> where is the shuttle valve?
>>> how do we get the gear actuator out to inspect?
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: gord
>>> Sent: Tuesday, May 29, 2012 7:30 AM
>>> To: 'Guy Doherty'
>>> Subject: RE: Yak-List: Re: Gear problem Yak 50
>>>
>>> The emergency tank , we have to open it again, then by putting on the
>>> parking brake and then using the rudder
>>>
>>> -----Original Message-----
>>> From: Guy Doherty [mailto:guysaircraft@bellnet.ca]
>>> Sent: May-29-12 7:25 AM
>>> To: gord@thedampub.ca; vicmolnar@aol.com
>>> Subject: Re: Yak-List: Re: Gear problem Yak 50
>>>
>>> Gord / Vic,
>>>
>>> Which tank do we empty the emergency or operator?
>>>
>>> Guy
>>>
>>> -----Original Message-----
>>> From: gord
>>> Sent: Monday, May 28, 2012 9:34 PM
>>> To: 'Guy Doherty'
>>> Subject: FW: Yak-List: Re: Gear problem Yak 50
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: owner-yak-list-server@matronics.com
>>> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Vic
>>> Sent: May-28-12 8:41 PM
>>> To: yak-list@matronics.com
>>> Subject: Yak-List: Re: Gear problem Yak 50
>>>
>>> --> Yak-List message posted by: "Vic"<vicmolnar@aol.com>
>>>
>>> Hi Gord,
>>>
>>> when you have activated the emergency system you wont be able to
> retract
>>> the landing gear subsequently. Just empty the emergency tank completely,
>>> close the tap and then do a refill to 50 bar and all should be working as
>>> usual. Only with this procedure the rubber ball in the respective shuttle
>>> valve will shift to the "normal" position.
>>>
>>> Cheers
>>> Vic
>>>
>>>
>>>
>>>
>>> Read this topic online here:
>>>
>>> http://forums.matronics.com/viewtopic.php?p=374120#374120
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>
>
>
>
>
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| Subject: | Re: LED replacements for the gear and tail lights |
Yes this is interesting.. The old bulbs are not very long life..-Gary G.
- CJ, -N22YK
--- On Tue, 5/29/12, mgdimarco <mgdimarco@yahoo.com> wrote:
From: mgdimarco <mgdimarco@yahoo.com>
Subject: Yak-List: LED replacements for the gear and tail lights
I am able to acquire LED replacements for the GE304s used in the CJ-6 (and
presumably Yak) gear and tail lights. Here are some photos. I'll be happy t
o order a pile of these if there is sufficient interest.
As a heads up, the two contacts on the bottom require some trimming due to
the springs on the poles in the sockets.
--------
Michael Di Marco
China Blue
mgdimarco@yahoo.com
407-608-3290
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=374230#374230
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le, List Admin.
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