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#1
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L13 Blanik Mandatory Bulletin
After a fatal accident in Austria LET issued a Mandatory Bulletin:
http://www.let.cz/files/bulletines/M...9a_english.pdf EASA issued an Emergency Airworthiness Directive: http://www.caa.co.uk/docs/33/easa_ad_2010_0119_E.pdf |
#2
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L13 Blanik Mandatory Bulletin
On Jun 22, 7:50*pm, Ernst wrote:
After a fatal accident in Austria LET issued a Mandatory Bulletin:http://www.let.cz/files/bulletines/M...9a_english.pdf EASA issued an Emergency Airworthiness Directive:http://www.caa.co.uk/docs/33/easa_ad_2010_0119_E.pdf Does anyone know if the L23 could have similar problem? |
#3
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L13 Blanik Mandatory Bulletin
Reading the MB, It appears that based on the "flight data" of the aircraft,
and high number of launches per flight hour, the concern is overstressing from repeated winch launches. LET is requesting all users submit flight statistics for further evaluation plus a one time inspection of the load bearing aft spar cap in the fuselage carry through structure. I do not know if the L-23 and the L-13 have the same construction for the aft spar cap. "Ernst" wrote in message ... After a fatal accident in Austria LET issued a Mandatory Bulletin: http://www.let.cz/files/bulletines/M...9a_english.pdf EASA issued an Emergency Airworthiness Directive: http://www.caa.co.uk/docs/33/easa_ad_2010_0119_E.pdf |
#4
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L13 Blanik Mandatory Bulletin
Provided that the correct weak link is always used, it should not be
easily possible to damage a glider by winch launching it. What aerobatics had this glider done? Derek C On Jun 23, 3:23*am, "BT" wrote: Reading the MB, It appears that based on the "flight data" of the aircraft, and high number of launches per flight hour, the concern is overstressing from repeated winch launches. LET is requesting all users submit flight statistics for further evaluation plus a one time inspection of the load bearing aft spar cap in the fuselage carry through structure. I do not know if the L-23 and the L-13 have the same construction for the aft spar cap. "Ernst" wrote in message ... After a fatal accident in Austria LET issued a Mandatory Bulletin: http://www.let.cz/files/bulletines/M...9a_english.pdf EASA issued an Emergency Airworthiness Directive: http://www.caa.co.uk/docs/33/easa_ad_2010_0119_E.pdf- Hide quoted text - - Show quoted text - |
#5
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L13 Blanik Mandatory Bulletin
Am 23.06.10 04:23, schrieb BT:
Reading the MB, It appears that based on the "flight data" of the aircraft, and high number of launches per flight hour, the concern is overstressing from repeated winch launches. LET is requesting all users Sigh. The urban legend lives. |
#6
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L13 Blanik Mandatory Bulletin
On Jun 23, 6:58*am, John Smith wrote:
Am 23.06.10 04:23, schrieb BT: Reading the MB, It appears that based on the "flight data" of the aircraft, and high number of launches per flight hour, the concern is overstressing from repeated winch launches. LET is requesting all users Sigh. The urban legend lives. Can you please clarify that remark? I don't see any urban legendry here. Winch launching inherently load the wings in bending more than aerotow. Maybe not enough to actually exceed the design load of the wings. But certainly enough to contribute a substantial amount of fatigue and to make a measurable difference in long-term service life. When fatigue has weakened a structure, and then you apply a load that exceeds the diminished capacity of that structure, it will fail. You can say that it was overstressed, or you can say that it wasn't overstressed and that it just exhibited a fatigue failure. Whatever you call it, you still have a broken structure. Thanks, Bob K. |
#7
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L13 Blanik Mandatory Bulletin
Bob Kuykendall wrote:
Can you please clarify that remark? I don't see any urban legendry here. Winch launching inherently load the wings in bending more than aerotow. Maybe not enough to actually exceed the design load of the wings. But certainly enough to contribute a substantial amount of Provided the correct weak link is used, the wing load during a winch launch never exceeds 2g. Each turbulence stresses the structure more than that. But as I've already said: Urban legends are here to stay. |
#8
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L13 Blanik Mandatory Bulletin
On Jun 23, 3:58*pm, John Smith wrote:
Bob Kuykendall wrote: Can you please clarify that remark? I don't see any urban legendry here. Winch launching inherently load the wings in bending more than aerotow. Maybe not enough to actually exceed the design load of the wings. But certainly enough to contribute a substantial amount of Provided the correct weak link is used, the wing load during a winch launch never exceeds 2g. Each turbulence stresses the structure more than that. But as I've already said: Urban legends are here to stay. Actually the maximum bending load on the wingspar during a winch is equivalent to about 3 g, due to the point loading on the fuselage and the lack of g unloading on the wings, but that still shouldn't cause a failure. I have looked at the newspaper reports on this accident, but they don't state which phase of flight the glider was in when it broke up. They say that it crashed into a forest, which sounds as though it was in free flight, rather on a winch launch when it would have been over the airfield. Does anyone have any better information? Derek C |
#9
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L13 Blanik Mandatory Bulletin
It would be a coincidence but could this be one of the Red Bull
Blaniks? They have Austrian registration and they get flown pretty hard. Is there a news article on the accident? Regards, Juan Carlos |
#10
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L13 Blanik Mandatory Bulletin
On Jun 25, 3:42*pm, JC wrote:
It would be a coincidence but could this be one of the Red Bull Blaniks? They have Austrian registration and they get flown pretty hard. Is there a news article on the accident? Regards, Juan Carlos http://aviation-safety.net/wikibase/wiki.php?id=74748 Link to an image of the glider in hangar on page. Not a Red Bull Blanik. Frank Whiteley |
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