ASN Wikibase Occurrence # 39250
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| Date: | Saturday 6 April 1991 |
| Time: | 12:20 |
| Type: | Schweizer SGS 1-30 |
| Owner/operator: | Wurtsboro Flight Service |
| Registration: | N3620D |
| MSN: | 20 |
| Total airframe hrs: | 1240 hours |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Wurtsboro, NY -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE GLIDER WAS OBSERVED IN A STEEP NOSE DOWN PITCH ATTITUDE. JUST ABOVE THE TERRAIN, THE NOSE PITCHED UP AND THE LEFT WING FAILED AT THE WING ROOT. THE GLIDER STRUCK TREES, DESCENDING TO THE GROUND. POST CRASH EXAMINATION SHOWED THE WING HAD FAILED IN OVERLOAD. ACCORDING TO THE MANUFACTURER, THE WING HAD AN ULTIMATE FAILURE LOAD OF 9.72G. EXAMINATION OF THE GLIDER SHOWED TAPE ON THE TRIM DISCONNECT SYSTEM AND CONTROL STICK. THIS IS A TECHNIQUE USED BY COMPETITION PILOTS TO REDUCE THE CONTROL FORCES. THERE IS A FLIGHT MANUAL LIMITATION AGAINST OPERATING WITH SPEEDS IN EXCESS OF 108 MPH WITH THE TRIM DISCONNECTED. FLIGHT TESTING BY THE MANUFACTURER SHOWED THE GLIDER HAD 'NEAR TO NEUTRAL STABILITY' WITH THE TRIM DISCONNECTED. CAUSE: AN INFLIGHT FAILURE OF THE LEFT WING SPAR DUE TO OVERLOAD FROM PILOT INDUCED CONTROL INPUTS, WHILE RECOVERING FROM A DIVE. FACTORS RELATED TO THE ACCIDENT WERE, THE PILOT'S DECISION TO FLY WITH THE TRIM SYSTEM DISCONNECTED AND LACK OF RECENT EXPERIENCE IN MAKE AND MODEL OF GLIDER.
Sources:
NTSB: https://www.ntsb.gov/ntsb/brief.asp?ev_id=20001212X16860_
NTSB Identification: NYC91LA102
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 02-Nov-2009 02:32 | DColclasure | Updated |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
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