ASN Wikibase Occurrence # 37879
Last updated: 11 March 2014
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Narrative: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. 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.
|Owner/operator:||Lima Lima Flying Squadron|
|C/n / msn:|| CN2|
|Fatalities:||Fatalities: 1 / Occupants: 2|
|Airplane damage:|| Written off (damaged beyond repair)|
|Location:||Oswego, IL -
United States of America
|Phase:|| Manoeuvring (airshow, firefighting, ag.ops.)|
|Departure airport:||Naperville, IL (LL10)|
|Destination airport:||Chicago, IL (CGX)|
Number of views: 680