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delfin_driver(at)yahoo.co
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 Posted: Fri Sep 02, 2011 8:30 am Post subject: Yak-52 |
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I am trying to find a way to adjust the uplock on the YAK 52 nose gear. Mine is coming up and causing the uplock to swing around hard and hit the spacer tab behind it. Is there any adjustment for the nose uplock? The down lock is preloaded and appears correct. Any thoughts?
thanks
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dsavarese0812(at)bellsout
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| Posted: Sat Sep 03, 2011 6:13 am Post subject: Yak-52 |
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| Quote: | If you push up manually on the "parrot hook" (the uplock hook), will
it lock in place? Then move the lever end where the spring attaches
extending the spring. The hook should disengage. If the hook doesn't
lock sharply into the up position (ie: you can't pull it down), you
may want to disassemble the mechanism and clean all the rust ane
corrosion from the pivots etc.
Is the drag link (what the nose gear actuator attaches to) on the nose
gear 100% straight when the gear is down and locked?
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 9/2/2011 11:27 AM, delfin wrote:
>
> I am trying to find a way to adjust the uplock on the YAK 52 nose
> gear. Mine is coming up and causing the uplock to swing around hard
> and hit the spacer tab behind it. Is there any adjustment for the
> nose uplock? The down lock is preloaded and appears correct. Any
> thoughts?
> thanks
>
|
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CD 2.0
Joined: 21 Feb 2011
Posts: 43
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| Posted: Sun Sep 04, 2011 2:25 pm Post subject: Re: Yak-52 |
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Did you check why is out of place?
Although this most likely is not related to the issue you’re experiencing, it comes to mind a Yak 50 that had a gear up landing few years ago because a right gear up-lock was engaged, and a turnbuckle linkage rod in the up-lock release mechanism had fractured…. (while under inspection, the up-lock was released manually and the gear lowered normally).
Checking the broken eye-end fitting, it showed that it had fractured due to a reverse bending fatigue mechanism oriented in the plane of the bending induced by the stiffness in the linkage.
During gear extension, the initial extension of the actuator causes the actuator body to move slightly, moving a bell-crank, which is connected to the up-lock mechanism input lever by a short turnbuckle linkage. The linkage consists of a rigid rod with a 'turnbuckle type' eye-end at each end. The eye-end fitting at the actuator end of the rod had broken under the head of the fork and it was found to be quite stiff…. this would cause bending each time the landing gear was operated.
By over tightening, subsequent repainting or lock wire misrouting might all have been contributing factors in restricting free movement of the eye-end. The other end of the linkage was undamaged and moved freely.
It is necessary to lubricate these parts “periodically” and it is more difficult to gain access to the end of the linkage where the broken end occurred. It’s also good to make a close visual inspection of the turnbuckle linkage, and a check for free movement. If a turnbuckle linkage eye-ends is found to be stiff…. even without cracks, it should be a warning sign.
Carl
| delfin_driver(at)yahoo.co wrote: | I am trying to find a way to adjust the uplock on the YAK 52 nose gear. Mine is coming up and causing the uplock to swing around hard and hit the spacer tab behind it. Is there any adjustment for the nose uplock? The down lock is preloaded and appears correct. Any thoughts?
thanks |
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dsavarese0812(at)bellsout
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| Posted: Sun Sep 04, 2011 6:22 pm Post subject: Yak-52 |
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Excellent commentary Carl. But the Yak 52 uplock mechanism is quite
different than the Yak 50 uplock mechanism.
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 9/4/2011 5:25 PM, CD 2.0 wrote:
| Quote: |
Did you check why is out of place?
Although this most likely is not related to the issue you’re experiencing, it comes to mind a Yak 50 that had a gear up landing few years ago because a right gear up-lock was engaged, and a turnbuckle linkage rod in the up-lock release mechanism had fractured…. (while under inspection, the up-lock was released manually and the gear lowered normally).
Checking the broken eye-end fitting, it showed that it had fractured due to a reverse bending fatigue mechanism oriented in the plane of the bending induced by the stiffness in the linkage.
During gear extension, the initial extension of the actuator causes the actuator body to move slightly, moving a bell-crank, which is connected to the up-lock mechanism input lever by a short turnbuckle linkage. The linkage consists of a rigid rod with a 'turnbuckle type' eye-end at each end. The eye-end fitting at the actuator end of the rod had broken under the head of the fork and it was found to be quite stiff…. this would cause bending each time the landing gear was operated.
By over tightening, subsequent repainting or lock wire misrouting might all have been contributing factors in restricting free movement of the eye-end. The other end of the linkage was undamaged and moved freely.
It is necessary to lubricate these parts “periodically” and it is more difficult to gain access to the end of the linkage where the broken end occurred. It’s also good to make a close visual inspection of the turnbuckle linkage, and a check for free movement. If a turnbuckle linkage eye-ends is found to be stiff…. even without cracks, it should be a warning sign.
Carl
delfin_driver(at)yahoo.co wrote:
> I am trying to find a way to adjust the uplock on the YAK 52 nose gear. Mine is coming up and causing the uplock to swing around hard and hit the spacer tab behind it. Is there any adjustment for the nose uplock? The down lock is preloaded and appears correct. Any thoughts?
>
> thanks
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=351414#351414
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CD 2.0
Joined: 21 Feb 2011
Posts: 43
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| Posted: Sun Sep 04, 2011 7:05 pm Post subject: Re: Yak-52 |
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Thank you Dennis. My mistake not to have made it more clear that I was talking about a somehow (hypothetically speaking) related issue on a Yak 50 and why it should be taken into consideration, aside from the differences, of potential causes for any kind of displacement.
Carl
| dsavarese0812(at)bellsout wrote: | Excellent commentary Carl. But the Yak 52 uplock mechanism is quite
different than the Yak 50 uplock mechanism.
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 9/4/2011 5:25 PM, CD 2.0 wrote:
| Quote: |
Did you check why is out of place?
Although this most likely is not related to the issue you’re experiencing, it comes to mind a Yak 50 that had a gear up landing few years ago because a right gear up-lock was engaged, and a turnbuckle linkage rod in the up-lock release mechanism had fractured…. (while under inspection, the up-lock was released manually and the gear lowered normally).
Checking the broken eye-end fitting, it showed that it had fractured due to a reverse bending fatigue mechanism oriented in the plane of the bending induced by the stiffness in the linkage.
During gear extension, the initial extension of the actuator causes the actuator body to move slightly, moving a bell-crank, which is connected to the up-lock mechanism input lever by a short turnbuckle linkage. The linkage consists of a rigid rod with a 'turnbuckle type' eye-end at each end. The eye-end fitting at the actuator end of the rod had broken under the head of the fork and it was found to be quite stiff…. this would cause bending each time the landing gear was operated.
By over tightening, subsequent repainting or lock wire misrouting might all have been contributing factors in restricting free movement of the eye-end. The other end of the linkage was undamaged and moved freely.
It is necessary to lubricate these parts “periodically” and it is more difficult to gain access to the end of the linkage where the broken end occurred. It’s also good to make a close visual inspection of the turnbuckle linkage, and a check for free movement. If a turnbuckle linkage eye-ends is found to be stiff…. even without cracks, it should be a warning sign.
Carl
delfin_driver(at)yahoo.co wrote:
> I am trying to find a way to adjust the uplock on the YAK 52 nose gear. Mine is coming up and causing the uplock to swing around hard and hit the spacer tab behind it. Is there any adjustment for the nose uplock? The down lock is preloaded and appears correct. Any thoughts?
>
> thanks
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=351414#351414
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http://www.matronics.com/Navigator?Yak-List |
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