ASN Wikibase Occurrence # 278901
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| Date: | Sunday 6 October 2019 |
| Time: | 13:00 LT |
| Type: | Glaser-Dirks DG-500 |
| Owner/operator: | Tucson Soaring Club Inc. |
| Registration: | N600TT |
| MSN: | 5E 119 T50 |
| Year of manufacture: | 1994 |
| Total airframe hrs: | 1944 hours |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Marana, Arizona -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Private |
| Departure airport: | Tucson, AZ (AZ67) |
| Tucson, AZ (AZ67) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilots were performing aerobatic maneuvers in the glider. While recovering from a maneuver, the glider's airspeed increased past the never-exceed speed (Vne) and the elevator began to flutter. The right air brake (spoiler) deployed fully, though the spoiler control was in the locked position. After assessing the controllability of the glider, the pilots chose to land at the gliderport rather than perform an emergency egress. The glider landed hard and impacted brush, resulting in the separation of the empennage at the tailboom.
Postaccident examination revealed a separation of the right-wing air brake control drive system at the rod end, which resulted in the asymmetrical spoiler extension. The manufacturer stated that it should have been possible to deploy the left-wing air brake normally to compensate for the asymmetric behavior and have some (reduced) control over the approach glidepath. The manufacturer also stated there is no emergency procedure described in the flight manual for air brake malfunctions.
It is likely that the air brake control separation was the result of the pilots' exceedance of Vne during recovery from the aerobatic maneuver.
Probable Cause: The pilots' exceedance of the glider's never-exceed speed (VNE) during recovery from an intentional aerobatic maneuver, which resulted in a failure of the right-wing air brake control drive, asymmetrical air brake deployment, and a subsequent hard landing.
Accident investigation:
 |
|
Sources:
NTSB WPR20LA004
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 05-Jun-2022 11:35 | ASN Update Bot | Added |
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