ASN Wikibase Occurrence # 43836
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Date: | Saturday 31 March 2007 |
Time: | 15:30 |
Type: | SZD-36 Cobra 15 |
Owner/operator: | Private |
Registration: | N6SZ |
MSN: | W813 |
Total airframe hrs: | 556 hours |
Fatalities: | Fatalities: 1 / Occupants: 1 |
Aircraft damage: | Substantial |
Category: | Accident |
Location: | Sylacauga Municipal Airport - KSCD, AL -
United States of America
|
Phase: | En route |
Nature: | Private |
Departure airport: | Sylacauga, AL (SCD) |
Destination airport: | Sylacauga, AL (SCD) |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:Witnesses stated that the glider had been airborne for about 30 minutes when they observed both wings fold up, and the glider descend out of control until impacting into a rock quarry. The wings were located about 1/2-mile north of the impact crater on the upper rim of the quarry. Examination of the wreckage revealed that during assembly, the lower attach pin had failed to enter the lower attachment hole on the left wing. The misalignment allowed the pin to rest on the top surface of the left wing attach lug in a clamping action. Examination of the mechanism that actuates the movement of both pins found that there had been two tabs located above the center pivot, and these two tabs were not found. Examination of the area where the two tabs were missing disclosed that these tabs had been missing for an extended period of time, as the upward motion of the mechanism (center pivot) had machined into the surface above where the upper tabs should have been located. The misalignment of the attach pin in the lower attachment hole allowed the left wing to move upwards to about 45 degrees and separate.
Probable Cause: The pilot's improper installation of the left wing attachment pin, which allowed it to disengage during cruise flight, resulting in wing separation.
Accident investigation:
|
| |
Investigating agency: | NTSB |
Report number: | ATL07LA066 |
Status: | Investigation completed |
Duration: | |
Download report: | Final report |
|
Sources:
NTSB:
https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20070403X00369&key=1 Location
Revision history:
Date/time | Contributor | Updates |
28-Oct-2008 00:45 |
ASN archive |
Added |
23-Nov-2013 21:45 |
Alpine Flight |
Updated [Time, Aircraft type, Cn, Operator, Location, Departure airport, Destination airport, Damage, Narrative] |
21-Dec-2016 19:24 |
ASN Update Bot |
Updated [Time, Damage, Category, Investigating agency] |
04-Dec-2017 18:33 |
ASN Update Bot |
Updated [Cn, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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