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#1
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Schempp Hirth or its Representatives...
It appears that a third S-H aircraft has broken up in flight this
season. Rather than giving private assurances/explanations to individual S-H owners, could someone in-the-know please tell us what is going on? |
#2
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Schempp-Hirth updated its homepage today with information concerning the
Discus CS incident. http://www.schempp-hirth.com/de/index.html Available in German, I guess an English translation will follow. BTW: The pilot bailed out successfully. Stefan |
#3
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Rough translation of the Schempp Hirth notice:
During a flight in turbulent air in Southern France a Discus CS went into an uncontrolled flight attitude. During the following recovery maneuver the outerwing broke off 3.80 m from the wingtip. Within the range of the location of fracture, a defect in the gluing of the spar boom was determined. The pilot fortunately saved himself with his parachute. Due to this incident, the airworthiness of Discus CS series is withdrawn, since a production defect cannot be excluded. The instructions for airworthiness (airworthiness directives) Nr.2003-265 and Nr.2003-266 were likewise extended for some Discus b and the motorglider Discus built with the wings of the Discus CS bT. The withdrawal of the airworthiness will be limited up to the time the wings can be examined and repaired where necessary. At the moment we can unfortunately give no data for the necessary corrective measures, since the responsible office for air in Tschechien must agree with all actions and an appropriate work date (with LBA, BFU, and SHK) by this Czech authority unfortunately can be done only after September 24th. The appropriate TM to this procedure can be published therefore only after this date. As soon as we have further information, we will report immediately here "Chris OCallaghan" wrote in message om... It appears that a third S-H aircraft has broken up in flight this season. Rather than giving private assurances/explanations to individual S-H owners, could someone in-the-know please tell us what is going on? |
#4
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At 19:12 17 September 2003, Stewart Kissel wrote:
F. Fuchs has the links to two separate Discus events in his recent post-g= o into the current Discus thread. Stewart, I think that what you are looking at is actually the two separate LBA ADs required to cover the grounding of all the Disci with Czech wings. Most of them are Discus models but there are some Discus BTs with Czech wings. They are certified as different types and so have to have separate ADs. John Galloway |
#5
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John,
If you are still wondering about the 4DM breakup, read the NTSB report. From reading the report, the plane did not fail. Mark |
#6
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At 02:42 18 September 2003, Janus2k wrote:
John, If you are still wondering about the 4DM breakup, read the NTSB report. From reading the report, the plane did not fail. Mark Actually the wings did fail. They presumably failed above their design load limit. but they still failed in flight causing the crash. A better question would be, how much of a design cushion is there between the load limit and actual failure of the wing? |
#7
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Th DG website has an article and video of the destruction testing of the DG
1000 wing during certification. Also a section on the Fuse tests and a link to another page regarding the regs the all gliders are built to. Worth a read. The video is spectacular. URL is http://www.dg-flugzeugbau.de/ Then click on DG 1000 and its there. Cheers Paul "Steve Davis" wrote in message ... At 02:42 18 September 2003, Janus2k wrote: John, If you are still wondering about the 4DM breakup, read the NTSB report. From reading the report, the plane did not fail. Mark Actually the wings did fail. They presumably failed above their design load limit. but they still failed in flight causing the crash. A better question would be, how much of a design cushion is there between the load limit and actual failure of the wing? |
#8
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#9
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The NTSB conclude around 55% on the crash that killed Engen. That one
appears to have been pilot error. Inadvertent spin, recovered at 45 deg nose down, but the pilots appear to have pushed over to (or allowed the aircraft to rotate) vertical before trying to pull out. If I recall correctly the outer panels failed at a calculated 55% over certified load... Co-incidently this was very close to what Schempp had stated the design was good for. After a recent fatality some tests were performed in SA - proving that a cross-controlled entry into a spin from thermalling with a current flapped 15m racer at full ballast results in an extremely rapid entry, with a roll over often past the vertical and recovery at VNe even if you were expecting it. The caption is to be careful out there. One comment - the NTSB investigators did find some deviations from the design layup in the wings - although in this instance all of them were neutral or increased the strength. Steve Davis wrote: At 02:42 18 September 2003, Janus2k wrote: John, If you are still wondering about the 4DM breakup, read the NTSB report. From reading the report, the plane did not fail. Mark Actually the wings did fail. They presumably failed above their design load limit. but they still failed in flight causing the crash. A better question would be, how much of a design cushion is there between the load limit and actual failure of the wing? |
#10
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Doris and I just returned from another funeral, so I missed some email
messages for a few days. I spoke with the Schempp-Hirth factory and they tell me they have now checked a fairly large number of Discus and have found no problems. In the meantime, the German LBA will issue some kind of directive after a meeting on September 24th. The obvious prudent course is to not fly any affected Discus models specified in the following document until after this meeting: http://www.lba.de/dokumente/ad/2003-266-e.pdf Schempp-Hirth owners may want to sign up for my free newsletter at www.eglider.org as this is the easiest way for me to communicate with everyone. Tom Knauff Knauff & Grove Soaring Supplies Julian, Pa Phone 814-355-2483 "Chris OCallaghan" wrote in message om... It appears that a third S-H aircraft has broken up in flight this season. Rather than giving private assurances/explanations to individual S-H owners, could someone in-the-know please tell us what is going on? |
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