ASN Wikibase Occurrence # 37878
Last updated: 25 October 2014
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Date:01-OCT-1999
Time:1600
Type:Silhouette image of generic T34P model; specific model in this crash may look slightly different
Beechcraft T-34 Mentor
Owner/operator:Gene D Martin
Registration: N5367G
C/n / msn: BG243140909
Fatalities:Fatalities: 1 / Occupants: 2
Other fatalities:0
Airplane damage: Substantial
Location:Oswego, IL -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Unknown
Departure airport:Naperville, IL (LL10)
Destination airport:Chicago, IL (CGX)
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.

Sources:
NTSB: http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001212X19911


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
Number of views: 741

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