Today's Message Index:
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1. 01:18 PM - Re: Another nose gear failure (barrynorman@comcast.net)
2. 01:36 PM - Re: Another nose gear failure (GREGSMI@aol.com)
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| Subject: | Re: Another nose gear failure |
Greg,
Are these nose gears on planes before the Skystar nose gear?
Barry
----- Original Message -----
From: GREGSMI@aol.com
Sent: Wednesday, July 17, 2013 9:15:41 PM
Subject: Pulsar-List: 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 crack
ed. 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
=93 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 insi
de the collar thus an inspection may not reveal the failure until it happen
s. If a total failure occurs it can cause considerable damage to the aircra
ft, 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
=99s, where the nose gear weight is high, or using non hard surface runw
ays, 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 i
n service for a while, it is safe to say that all nose gears should be care
fully inspected for cracks in the weld area and also check the spindle to a
ssure it is straight. If bent or a crack has formed, the gear needs immedia
te attention. Since the collar may hide a fatigue crack in the spindle, eve
n these inspections may not reveal a problem.
We have two engineers in our group that are working on a simple fix, simila
r 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,
============
==
Message 2
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| Subject: | Re: Another nose gear failure |
Yes, this is the Aerodesigns nose gear.
In a message dated 7/18/2013 3:18:27 P.M. Central Daylight Time,
barrynorman@comcast.net writes:
Greg,
Are these nose gears on planes before the Skystar nose gear?
Barry
____________________________________
From: GREGSMI@aol.com
Sent: Wednesday, July 17, 2013 9:15:41 PM
Subject: Pulsar-List: 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
=93 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
=99s,
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 spin
dle,
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. W
hen
the details are worked out, the repair will be offered to the group. Drawi
ngs
will be provided and if desired, they can provide a complete repair.
Be safe,
Greg
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