ASN Wikibase Occurrence # 42509
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| Date: | Tuesday 20 September 1988 |
| Time: | 18:25 |
| Type: |  Bellanca 8KCAB Decathlon |
| Owner/operator: | private |
| Registration: | N50702 |
| MSN: | 616-80 |
| Total airframe hrs: | 1343 hours |
| Engine model: | LYCOMING AEIO-360-H1A |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Oswego, IL -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Private |
| Departure airport: | Plainfield, IL (1C5) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DRG AEROBATICS, THE ACFT WENT IN A DIVE, GAINED SPEED, LEVELED OFF & PULLED UP ABRUPTLY. DRG THE PULL-UP, THE RGT WING FAILED UPWARD & separated FM THE ACFT. THE ACFT THEN WENT OUT OF control & CRASHED. THE PLT WAS WEARING A PARACHUTE, BUT DID NOT BAIL-OUT; HE WAS FOUND STRAPPED IN HIS SEAT & THE DOOR RLS PIN WAS STILL IN PLACE. THERE WAS EVIDENCE OF UPWARD BENDING OF THE LEFT WING; BOTH HORIZONTAL STABILIZERS HAD EVIDENCE OF BEING COMPROMISED IN A DWNWRD DRCTN. AN EXAM OF THE PLT'S SEAT REVEALED THE TUBULAR ENDS OF THE SEAT-BACK FRAME HAD FAILED AT THE PIVOT POINTS (PVT PTS), WHERE THE SEAT-BACK WAS DESIGNED TO PIVOT forward over THE SEAT PAN TO ALLOW ENTRY TO THE AFT SEAT. ATTACHING BOLTS AT THE PVT PTS HAD PULLED THRU THE ENDS OF THE FRAME. EVIDENCE OF OVERSTRESS SHEAR WAS FND AT THE RGT PVT PT AS IF THE SEAT-BACK HAD FAILED AFT. EVIDENCE OF OVERSTRESS SHEAR & TWISTING DEFORMATION WAS FND AT THE LEFT PVT PT. BELLANCA 7 & 8 SERIES ACFT HAVE HAD SVRL SEATBACK FAILURES AT THE HINGE POINT OR AT THE WELDED JUNCTION OF THE SEAT'S LOWER SIDE TUBE & SEATBACK SIDE BRACE. CAUSE: INADEQUATE DESIGN INTHE MANUFACTURE OF THE PILOT'S SEAT WHICH FAILED DURING INTENTIONAL AEROBATIC MANEUVERS FOR WHICH THE AIRCRAFT INCLUDING THE SEAT WERE INTENDED.
Sources:
NTSB: http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001213X26785
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:24 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
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