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ASN Wikibase Occurrence # 29473
Last updated: 18 January 2021
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Type:Silhouette image of generic ask1 model; specific model in this crash may look slightly different
Schleicher ASK 21
Owner/operator:Turf Soaring School
Registration: N274KS
C/n / msn: 21195
Fatalities:Fatalities: 2 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:0,5mile N of Peoria-Pleasant Valley Airport, AZ -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Departure airport:Peoria, AZ (P48)
Destination airport:Peoria, AZ (P48)
Investigating agency: NTSB
The commercial certificated pilot of an aerobatic glider, with one passenger, was performing a series of aerobatic maneuvers within an aerobatic box, which was adjacent to runway 5L at an uncontrolled airport. The aerobatic box measured 1 kilometer square, and extended from the surface up to 6,600 feet msl (5000' agl). The southern boundary of the aerobatic box was located about 1,490 feet north of runway 5L's centerline. Concurrently, a Piper J3C airplane with the commercial pilot/flight instructor/airplane owner seated in the front seat, and a private pilot seated in the rear seat, departed runway 5L, and made a left downwind turn into the area where the glider was performing the aerobatic maneuvers. Witnesses said that as the glider reached the top of the loop, the nose lowered, eventually pointing straight down. As the glider began to recover from the maneuver, about 600 feet agl, the left wing of the oncoming Piper struck the tail of the glider between the empennage and the main fuselage, severing the empennage of the glider. Witnesses said that during the collision, a large portion of the left outboard wing of the Piper separated, and both the glider and the Piper entered uncontrolled descents. Both aircraft came to rest close to the center of the aerobatic box. According to the airport facilities directory, aircraft departing from runway 5L, are instructed to fly a right-hand traffic pattern. However, the airport's segmented circle depicts a left-hand departure from runway 5L. Radio equipped aircraft may utilize a common traffic advisory frequency of 122.9 Hz. Neither of the aircraft involved in the accident had a radio, nor were they required to. The front seat pilot of the Piper had based the accident airplane at the accident airport for several years, and was familiar with the procedures for operating at the airport.

Probable Cause: The inadequate visual lookout by the pilots of both aircraft, which resulted in their failure to see-and-avoid each other's aircraft and a subsequent midair collision. A factor associated with the accident was the airplane pilot's failure to determine that the aerobatic box was in use by the glider prior to his entry into the aerobatic box.



Revision history:

27-Sep-2008 01:00 ASN archive Added
15-Jan-2009 12:19 harro Updated
21-Dec-2016 19:16 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:20 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
08-Dec-2017 20:28 ASN Update Bot Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]

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