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ASN Wikibase Occurrence # 66699
Last updated: 18 November 2021
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Date:01-MAY-1999
Time:15:03
Type:Silhouette image of generic DG40 model; specific model in this crash may look slightly different
Glaser-Dirks DG-400
Owner/operator:Private
Registration: N400FJ
MSN: 4-78
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:New Milford, Connecticut -   United States of America
Phase: En route
Nature:Private
Departure airport:Burlington, CT (22B)
Destination airport:
Investigating agency: NTSB
Narrative:
While in flight, at an indicated airspeed of 60 knots, a 'loud bang' was heard and the gear warning alarm began to sound. The pilot looked to the left and observed the left wing displaced 20 degrees up from its normal position. The glider began to descend and control inputs by the pilot were unresponsive. In the decent, as the glider's speed began to increase, the pilot elected to egress from the glider. The glider broke apart in flight and descended to the ground. A piece of the glider's fiberglass skin that contained a residue of an adhesive on the inside surface was removed and examined. The adhesive area would have attached spar pin-lock assembly, which secured the wing spar pins. The surface of this epoxy layer contained impression marks similar to a cross-weave pattern found on the surface of fiberglass. The cross-weave pattern on the surface of the epoxy was consistent with a fracture that traveled between the UD-glass fabric tape and the epoxy layer. This separation was characterized as an adhesive separation. The surface of the epoxy layer also contained exposed voids. No bonding between the epoxy and UD-glass fabric tape was observed in the void areas.
Probable Cause: The manufacturer's use of inadequate adhesive material which resulted in the de-bonding and subsequent failure of the wing spar pin-lock assembly.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X18857&key=1


Revision history:

Date/timeContributorUpdates
29-Jul-2009 21:21 DColclasure Added
26-Jun-2013 14:07 Alpine Flight Updated [Time, Cn, Nature, Departure airport, Destination airport, Narrative]
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
26-Nov-2017 15:13 ASN Update Bot Updated [Operator, Departure airport, Destination airport, Source, Narrative]

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