ASN Wikibase Occurrence # 210458
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| Date: | Saturday 5 May 2018 |
| Time: | 09:05 |
| Type: |  Aeronca 7AC Champ |
| Owner/operator: | New York Champs Flying Club Inc |
| Registration: | N84396 |
| MSN: | 7AC-3089 |
| Year of manufacture: | 1946 |
| Total airframe hrs: | 4841 hours |
| Engine model: | Continental A-65-8F |
| Fatalities: | Fatalities: 1 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Middletown, Orange County, New York -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Training |
| Departure airport: | Middletown, NY (06N) |
| Middletown, NY (06N) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot and flight instructor were conducting a flight review in an airplane owned by a flying club. Shortly after takeoff, when the airplane was about ½ mile from the departure end of the runway, a witness reported that the airplane "suddenly went nose down." The airplane impacted a row of trees on the edge of a field in a near-vertical nose-down attitude. No ground scars were found, and no tree damage was found other than that directly above the wreckage, consistent with little or no forward speed. Thus, the airplane had likely exceeded its critical angle of attack, resulting in an aerodynamic stall from which the pilot was unable to recover.
Witness marks on the engine's crankcase nose seal area, were consistent with a directly aft impact by the propeller mounting bolt nuts and showed no indications of scraping or rotation. In addition, there was no chordwise scratching and relatively little leading edge damage to the propeller blades. The lack of any chordwise scratching and relatively little leading edge damage to the propeller blades, while not conclusive, is suggestive of slow or no rotation of the propeller as descended through the trees. Examination of the airframe and engine otherwise revealed no evidence of preimpact failures that would have precluded normal operation.
The rear seat shoulder harness anchor separated from its attachment point to the fuselage tubing during the accident sequence. Although the bolt securing the anchor was not installed in accordance with the manufacturer's instructions (the bolt head was facing up instead of the nut), the installation error likely did not cause the failure. Instead, the failure was due to the anchor sliding forward between the fuselage tubes. The investigation could not determine if the rear seat shoulder harness anchor failed due to a design issue or loads beyond the design criteria.
Probable Cause: The pilot's exceedance of the airplane's critical angle of attack during climbout, which resulted in an aerodynamic stall from which the pilot could not recover.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=84396
Location
Media:
Aeronca 7AC Plane Crashes Into Trees in Middletown, Orange County, New York, USA. 2 occupants, 1 fatalitie.https://t.co/nMnBjyhALZ via @nbcnewyork pic.twitter.com/fAZr9Rypev
— Planes Of Legend (@PlanesOfLegend) 5 mai 2018
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 05-May-2018 16:28 | gerard57 | Added |
| 05-May-2018 18:00 | Anon. | Updated [Aircraft type, Source] |
| 05-May-2018 18:04 | harro | Updated [Departure airport] |
| 05-May-2018 20:10 | Anon. | Updated [Total fatalities, Source] |
| 05-May-2018 20:10 | harro | Updated [Narrative] |
| 05-May-2018 20:40 | Iceman 29 | Updated [Source, Embed code] |
| 05-May-2018 23:16 | Geno | Updated [Time, Aircraft type, Registration, Cn, Operator, Phase, Nature, Source, Embed code, Damage, Narrative] |
| 06-May-2018 05:51 | Iceman 29 | Updated [Source, Narrative] |
| 07-May-2018 19:00 | Anon. | Updated [Damage] |
| 22-May-2020 09:24 | ASN Update Bot | Updated [Time, Operator, Departure airport, Destination airport, Source, Damage, Narrative, Accident report, ] |
| 20-Nov-2022 08:03 | Ron Averes | Updated [Location, Source, Narrative] |
| 20-Nov-2022 22:57 | Ron Averes | Updated [Location] |
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