ASN Wikibase Occurrence # 37878
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| Date: | Friday 1 October 1999 |
| Time: | 16:00 |
| Type: |  Beechcraft D45 Mentor |
| Owner/operator: | Private |
| Registration: | N5367G |
| MSN: | BG-243 |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Oswego, IL -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | Naperville, IL (LL10) |
| Chicago, IL (CGX) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
N300SH, a Beech D-45, was destroyed on impact with terrain following a midair collision with N5367G, a Beech T-34, during a practice maneuver by the Lima Lima Flying Squadron. Both aircraft departed in sequence from 6-ship delta formation to perform a maneuver called a pop top break. The pop top break involved each aircraft to depart from the formation in sequence by entering a climbing 180-degree turn to follow the lead aircraft in trail. The narrow area of the human eye's visual field is approximately 10-15 degrees. A video tape of the accident flight shows a delayed entry into the turn by the D-45 relative to the T-34's entry into the maneuver. The pilot of the T-34 stated that he did not see the D-45 prior to the midair collision. The Lima Lima Flying Squadron did not have procedures in place to recover or adjust for maneuvers that were not successful.
Probable Cause: the visual lookout not obtained by the pilot of the Beech T-34 and the inadequate procedure by the Lima Lima Flying Squadron. The delayed entry into the maneuver by the pilot of the Beech D-45 was a contributing factor.
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X19911&key=1
ex.US Navy/Bu140909.
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 28-Jun-2016 15:57 | TB | Updated [Source, Damage] |
| 28-Jun-2016 20:01 | TB | Updated [Aircraft type] |
| 28-Jun-2016 20:01 | TB | Updated [Aircraft type] |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 14-Dec-2017 09:42 | ASN Update Bot | Updated [Total occupants, Source, Narrative] |
| 08-Feb-2022 09:54 | A.J.Scholten | Updated [Cn, Source, Narrative] |
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