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gregsmi
Joined: 01 Jan 2011
Posts: 268
Location: Topeka, KS
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 Posted: Wed Jul 17, 2013 5:17 pm Post subject: Another nose gear failure |
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We have another nose gear failure, this one caught by the owner, during an inspection. In this case, the weld on the back side of the collar had cracked. Fortunately, this was caught before the nose gear fell off.
This is the forth failure I know about in the last two years in the United States. I have talked with Alan Gill in the UK and he says they had 4 – 5 failures and have started modifying the gears to a sleeve and bolt concept. The issue is that the majority of spindle failures have been inside the collar thus an inspection may not reveal the failure until it happens. If a total failure occurs it can cause considerable damage to the aircraft, imagine landing your plane with the front wheel and fork missing.
It is difficult to say what is causing the failures but if you are loading the nose gear, an example is 582 flown with full header tank or all 912’s, where the nose gear weight is high, or using non hard surface runways, then the nose gear is carrying a lot of weight.
In any event, given the crack found today on a 912 aircraft that has been in service for a while, it is safe to say that all nose gears should be carefully inspected for cracks in the weld area and also check the spindle to assure it is straight. If bent or a crack has formed, the gear needs immediate attention. Since the collar may hide a fatigue crack in the spindle, even these inspections may not reveal a problem.
We have two engineers in our group that are working on a simple fix, similar to that used in the UK. They should have it completed this week. When the details are worked out, the repair will be offered to the group. Drawings will be provided and if desired, they can provide a complete repair.
Be safe,
Greg
[quote][b]
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barrynorman(at)comcast.ne
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| Posted: Thu Jul 18, 2013 12:18 pm Post subject: Another nose gear failure |
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Greg,
Are these nose gears on planes before the Skystar nose gear?
Barry
From: GREGSMI(at)aol.com
To: Pulsar-Aviators(at)yahoogroups.com, pulsar-list(at)matronics.com
Sent: Wednesday, July 17, 2013 9:15:41 PM
Subject: Another nose gear failure
We have another nose gear failure, this one caught by the owner, during an inspection. In this case, the weld on the back side of the collar had cracked. Fortunately, this was caught before the nose gear fell off.
This is the forth failure I know about in the last two years in the United States. I have talked with Alan Gill in the UK and he says they had 4 – 5 failures and have started modifying the gears to a sleeve and bolt concept. The issue is that the majority of spindle failures have been inside the collar thus an inspection may not reveal the failure until it happens. If a total failure occurs it can cause considerable damage to the aircraft, imagine landing your plane with the front wheel and fork missing.
It is difficult to say what is causing the failures but if you are loading the nose gear, an example is 582 flown with full header tank or all 912’s, where the nose gear weight is high, or using non hard surface runways, then the nose gear is carrying a lot of weight.
In any event, given the crack found today on a 912 aircraft that has been in service for a while, it is safe to say that all nose gears should be carefully inspected for cracks in the weld area and also check the spindle to assure it is straight. If bent or a crack has formed, the gear needs immediate attention. Since the collar may hide a fatigue crack in the spindle, even these inspections may not reveal a problem.
We have two engineers in our group that are working on a simple fix, similar to that used in the UK. They should have it completed this week. When the details are worked out, the repair will be offered to the group. Drawings will be provided and if desired, they can provide a complete repair.
Be safe,
Greg
[quote]
arget="_blank">http://www.matronics.com/Navigator?Pulsar-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
[b]
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gregsmi
Joined: 01 Jan 2011
Posts: 268
Location: Topeka, KS
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| Posted: Thu Jul 18, 2013 12:36 pm Post subject: Another nose gear failure |
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Yes, this is the Aerodesigns nose gear.
In a message dated 7/18/2013 3:18:27 P.M. Central Daylight Time, barrynorman(at)comcast.net writes:
| Quote: | Greg,
Are these nose gears on planes before the Skystar nose gear?
Barry
From: GREGSMI(at)aol.com
To: Pulsar-Aviators(at)yahoogroups.com, pulsar-list(at)matronics.com
Sent: Wednesday, July 17, 2013 9:15:41 PM
Subject: Another nose gear failure
We have another nose gear failure, this one caught by the owner, during an inspection. In this case, the weld on the back side of the collar had cracked. Fortunately, this was caught before the nose gear fell off.
This is the forth failure I know about in the last two years in the United States. I have talked with Alan Gill in the UK and he says they had 4 – 5 failures and have started modifying the gears to a sleeve and bolt concept. The issue is that the majority of spindle failures have been inside the collar thus an inspection may not reveal the failure until it happens. If a total failure occurs it can cause considerable damage to the aircraft, imagine landing your plane with the front wheel and fork missing.
It is difficult to say what is causing the failures but if you are loading the nose gear, an example is 582 flown with full header tank or all 912’s, where the nose gear weight is high, or using non hard surface runways, then the nose gear is carrying a lot of weight.
In any event, given the crack found today on a 912 aircraft that has been in service for a while, it is safe to say that all nose gears should be carefully inspected for cracks in the weld area and also check the spindle to assure it is straight. If bent or a crack has formed, the gear needs immediate attention. Since the collar may hide a fatigue crack in the spindle, even these inspections may not reveal a problem.
We have two engineers in our group that are working on a simple fix, similar to that used in the UK. They should have it completed this week. When the details are worked out, the repair will be offered to the group. Drawings will be provided and if desired, they can provide a complete repair.
Be safe,
Greg
|
[quote][b]
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PreCompTech
Joined: 29 Jun 2013
Posts: 16
Location: Scappoose, OR
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| Posted: Sat Jul 20, 2013 3:06 pm Post subject: Re: Another nose gear failure |
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We'll definitely be interested in this before the new one is ever installed. 👍
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_________________
Kris Anderson, Owner
Precision Composites Technologies, LLC
509-521-7564
www.precomptech.com |
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surratt_do(at)msn.com
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| Posted: Sun Jul 21, 2013 9:04 am Post subject: Another nose gear failure |
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Greg, have these failures been with the solid cross strut or the spring/shock cross strut? I have the optional spring/shock that aero designs offered for the nose gear and would think that would mitigate sudden and hard shock to the nose gear collar and weld area of the pivot bolt fork area. Have not seen any of the e-mails when failures happen stating if the nose gear had the shock system or not?thanks Don Surratt
From: GREGSMI(at)aol.com
Date: Wed, 17 Jul 2013 21:15:41 -0400
Subject: Another nose gear failure
To: Pulsar-Aviators(at)yahoogroups.com; pulsar-list(at)matronics.com
We have another nose gear failure, this one caught by the owner, during an inspection. In this case, the weld on the back side of the collar had cracked. Fortunately, this was caught before the nose gear fell off.
This is the forth failure I know about in the last two years in the United States. I have talked with Alan Gill in the UK and he says they had 4 5 failures and have started modifying the gears to a sleeve and bolt concept. The issue is that the majority of spindle failures have been inside the collar thus an inspection may not reveal the failure until it happens. If a total failure occurs it can cause considerable damage to the aircraft, imagine landing your plane with the front wheel and fork missing.
It is difficult to say what is causing the failures but if you are loading the nose gear, an example is 582 flown with full header tank or all 912s, where the nose gear weight is high, or using non hard surface runways, then the nose gear is carrying a lot of weight.
In any event, given the crack found today on a 912 aircraft that has been in service for a while, it is safe to say that all nose gears should be carefully inspected for cracks in the weld area and also check the spindle to assure it is straight. If bent or a crack has formed, the gear needs immediate attention. Since the collar may hide a fatigue crack in the spindle, even these inspections may not reveal a problem.
We have two engineers in our group that are working on a simple fix, similar to that used in the UK. They should have it completed this week. When the details are worked out, the repair will be offered to the group. Drawings will be provided and if desired, they can provide a complete repair.
Be safe,
Greg
[quote]
===========
target="_blank">http://www.matronics.com/Navigator?Pulsar-List
===========
http://forums.matronics.com
===========
="_blank">http://www.matronics.com/contribution
===========
[b]
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gregsmi
Joined: 01 Jan 2011
Posts: 268
Location: Topeka, KS
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| Posted: Sun Jul 21, 2013 10:03 am Post subject: Another nose gear failure |
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The failures have occurred with both the solid strut and the shock.
Greg
In a message dated 7/21/2013 12:05:14 P.M. Central Daylight Time, surratt_do(at)msn.com writes:
| Quote: | Greg, have these failures been with the solid cross strut or the spring/shock cross strut? I have the optional spring/shock that aero designs offered for the nose gear and would think that would mitigate sudden and hard shock to the nose gear collar and weld area of the pivot bolt fork area. Have not seen any of the e-mails when failures happen stating if the nose gear had the shock system or not? thanks Don Surratt
From: GREGSMI(at)aol.com
Date: Wed, 17 Jul 2013 21:15:41 -0400
Subject: Another nose gear failure
To: Pulsar-Aviators(at)yahoogroups.com; pulsar-list(at)matronics.com
We have another nose gear failure, this one caught by the owner, during an inspection. In this case, the weld on the back side of the collar had cracked. Fortunately, this was caught before the nose gear fell off.
This is the forth failure I know about in the last two years in the United States. I have talked with Alan Gill in the UK and he says they had 4 – 5 failures and have started modifying the gears to a sleeve and bolt concept. The issue is that the majority of spindle failures have been inside the collar thus an inspection may not reveal the failure until it happens. If a total failure occurs it can cause considerable damage to the aircraft, imagine landing your plane with the front wheel and fork missing.
It is difficult to say what is causing the failures but if you are loading the nose gear, an example is 582 flown with full header tank or all 912’s, where the nose gear weight is high, or using non hard surface runways, then the nose gear is carrying a lot of weight.
In any event, given the crack found today on a 912 aircraft that has been in service for a while, it is safe to say that all nose gears should be carefully inspected for cracks in the weld area and also check the spindle to assure it is straight. If bent or a crack has formed, the gear needs immediate attention. Since the collar may hide a fatigue crack in the spindle, even these inspections may not reveal a problem.
We have two engineers in our group that are working on a simple fix, similar to that used in the UK. They should have it completed this week. When the details are worked out, the repair will be offered to the group. Drawings will be provided and if desired, they can provide a complete repair.
Be safe,
Greg
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[quote][b]
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pulsar1(at)sbcglobal.net
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| Posted: Sun Jul 21, 2013 12:11 pm Post subject: Another nose gear failure |
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I'm wondering if the failures have occurred with the 582 Pulsar's. So far I have had no issues with my 582 nose wheel.
George G
From: "GREGSMI(at)aol.com" <GREGSMI(at)aol.com>
To: pulsar-list(at)matronics.com
Sent: Sunday, July 21, 2013 11:00 AM
Subject: Re: Another nose gear failure
The failures have occurred with both the solid strut and the shock.
Greg
In a message dated 7/21/2013 12:05:14 P.M. Central Daylight Time, surratt_do(at)msn.com writes:
| Quote: | Greg, have these failures been with the solid cross strut or the spring/shock cross strut? I have the optional spring/shock that aero designs offered for the nose gear and would think that would mitigate sudden and hard shock to the nose gear collar and weld area of the pivot bolt fork area. Have not seen any of the e-mails when failures happen stating if the nose gear had the shock system or not? thanks Don Surratt
From: GREGSMI(at)aol.com
Date: Wed, 17 Jul 2013 21:15:41 -0400
Subject: Another nose gear failure
To: Pulsar-Aviators(at)yahoogroups.com; pulsar-list(at)matronics.com
We have another nose gear failure, this one caught by the owner, during an inspection. In this case, the weld on the back side of the collar had cracked. Fortunately, this was caught before the nose gear fell off.
This is the forth failure I know about in the last two years in the United States. I have talked with Alan Gill in the UK and he says they had 4 – 5 failures and have started modifying the gears to a sleeve and bolt concept. The issue is that the majority of spindle failures have been inside the collar thus an inspection may not reveal the failure until it happens. If a total failure occurs it can cause considerable damage to the aircraft, imagine landing your plane with the front wheel and fork missing.
It is difficult to say what is causing the failures but if you are loading the nose gear, an example is 582 flown with full header tank or all 912’s, where the nose gear weight is high, or using non hard surface runways, then the nose gear is carrying a lot of weight.
In any event, given the crack found today on a 912 aircraft that has been in service for a while, it is safe to say that all nose gears should be carefully inspected for cracks in the weld area and also check the spindle to assure it is straight. If bent or a crack has formed, the gear needs immediate attention. Since the collar may hide a fatigue crack in the spindle, even these inspections may not reveal a problem.
We have two engineers in our group that are working on a simple fix, similar to that used in the UK. They should have it completed this week. When the details are worked out, the repair will be offered to the group. Drawings will be provided and if desired, they can provide a complete repair.
Be safe,
Greg
|
[quote]ulsar-List" target="_blank" rel="nofollow">http://www.matronics.com/Nav.matronics.com/" target="_blank" rel="nofollow">http://forums.matronics==
[b]
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gregsmi
Joined: 01 Jan 2011
Posts: 268
Location: Topeka, KS
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| Posted: Sun Jul 21, 2013 1:31 pm Post subject: Another nose gear failure |
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George, cannot say for sure, but if you fly frequently with a full header tank you are placing a big load on the nose gear, the same as a 912 engine.
In a message dated 7/21/2013 3:11:32 P.M. Central Daylight Time, pulsar1(at)sbcglobal.net writes:
| Quote: | I'm wondering if the failures have occurred with the 582 Pulsar's. So far I have had no issues with my 582 nose wheel.
George G
From: "GREGSMI(at)aol.com" <GREGSMI(at)aol.com>
To: pulsar-list(at)matronics.com
Sent: Sunday, July 21, 2013 11:00 AM
Subject: Re: Pulsar-List: Another nose gear failure
The failures have occurred with both the solid strut and the shock.
Greg
In a message dated 7/21/2013 12:05:14 P.M. Central Daylight Time, surratt_do(at)msn.com writes:
| Quote: | Greg, have these failures been with the solid cross strut or the spring/shock cross strut? I have the optional spring/shock that aero designs offered for the nose gear and would think that would mitigate sudden and hard shock to the nose gear collar and weld area of the pivot bolt fork area. Have not seen any of the e-mails when failures happen stating if the nose gear had the shock system or not? thanks Don Surratt
From: GREGSMI(at)aol.com
Date: Wed, 17 Jul 2013 21:15:41 -0400
Subject: Another nose gear failure
To: Pulsar-Aviators(at)yahoogroups.com; pulsar-list(at)matronics.com
We have another nose gear failure, this one caught by the owner, during an inspection. In this case, the weld on the back side of the collar had cracked. Fortunately, this was caught before the nose gear fell off.
This is the forth failure I know about in the last two years in the United States. I have talked with Alan Gill in the UK and he says they had 4 – 5 failures and have started modifying the gears to a sleeve and bolt concept. The issue is that the majority of spindle failures have been inside the collar thus an inspection may not reveal the failure until it happens. If a total failure occurs it can cause considerable damage to the aircraft, imagine landing your plane with the front wheel and fork missing.
It is difficult to say what is causing the failures but if you are loading the nose gear, an example is 582 flown with full header tank or all 912’s, where the nose gear weight is high, or using non hard surface runways, then the nose gear is carrying a lot of weight.
In any event, given the crack found today on a 912 aircraft that has been in service for a while, it is safe to say that all nose gears should be carefully inspected for cracks in the weld area and also check the spindle to assure it is straight. If bent or a crack has formed, the gear needs immediate attention. Since the collar may hide a fatigue crack in the spindle, even these inspections may not reveal a problem.
We have two engineers in our group that are working on a simple fix, similar to that used in the UK. They should have it completed this week. When the details are worked out, the repair will be offered to the group. Drawings will be provided and if desired, they can provide a complete repair.
Be safe,
Greg
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| Quote: | ulsar-List" target="_blank" rel="nofollow">http://www.matronics.com/Nav.matronics.com/" target="_blank" rel="nofollow">http://forums.matronics==
ef="http://www.matronics.com/Navigator?Pulsar-List">http://www.matronics.com/Navigator?Pulsar-List
s.matronics.com/">http://forums.matronics.com
p://www.matronics.com/contribution">http://www.matronics.com/contribution
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