Wirestrike Accident CZAW SportCruiser N334BB, Wednesday 2 June 2010
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Date:Wednesday 2 June 2010
Type:Silhouette image of generic CRUZ model; specific model in this crash may look slightly different    
CZAW SportCruiser
Owner/operator:Sport Flyers
Registration: N334BB
MSN: 08SC218
Engine model:Rotax 912ULS
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Location:West of the runway of Gillespie Field (KSEE), San Diego, CA -   United States of America
Phase: Approach
Departure airport:San Diego, CA (SEE)
Destination airport:Ramona, CA (RNM)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The pilot reported that the airplane was about 50 feet above ground level during the takeoff climb when the right side of the canopy opened about 4 to 6 inches. As he reached to lower it, the left side of the canopy opened. The canopy was moving up and down erratically as the pilot attempted to stabilize it, and the airplane began pitch oscillations. The pilot notified the air traffic control tower controller that the canopy was open and that he needed to return for landing immediately. As the pilot turned onto the downwind leg of the traffic pattern, the pitch oscillations became increasingly erratic. The airplane lost altitude and subsequently collided with power lines, which pitched the airplane upside down into the street below.

Postaccident examination of the canopy noted that it was hinged in front of the cockpit and rotated forward when open. Examination of the latch mechanism revealed no mechanical anomalies.

The pilot reported that he followed the takeoff checklist and ensured that the canopy was closed and locked by pushing up on it, although this instruction was not in the pilot operating handbook (POH). Further examination of the POH noted a lack of guidance for verifying that the canopy was locked or for operating the airplane when the canopy inadvertently opened. It is likely that during the preflight, the canopy latches could have been partially engaged such that the pilot felt enough resistance to believe that the canopy was locked. The vibration encountered during the takeoff roll and the aerodynamic flow over the canopy at liftoff may have caused the canopy to become loose and open. After the accident, the manufacturer issued guidance indicating that if the canopy opened in flight, it would raise about 2 to 3.2 inches, but the airplane should remain fully controllable.
Probable Cause: The inadvertent opening of the aircraft canopy during the takeoff climb, which distracted the pilot and resulted in his failure to maintain aircraft control. Contributing to the accident was a lack of guidance in the manufacturer's pilot operating handbook addressing an open canopy during flight.

Accident investigation:
Investigating agency: NTSB
Report number: WPR10LA276
Status: Investigation completed
Duration: 1 year and 6 months
Download report: Final report




Revision history:

03-Jun-2010 01:54 RobertMB Added
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
26-Nov-2017 17:13 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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