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ASN Wikibase Occurrence # 37878
Last updated: 23 April 2018
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Type:Silhouette image of generic T34P model; specific model in this crash may look slightly different
Beechcraft D45 Mentor
Registration: N5367G
C/n / msn: BG243140909
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Airplane damage: Substantial
Location:Oswego, IL -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Departure airport:Naperville, IL (LL10)
Destination airport:Chicago, IL (CGX)
Investigating agency: NTSB
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.



Revision history:

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 fatalities, Source, Narrative]

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