The Air Accidents Investigation Branch (AAIB) said the aircraft, by modern standards, had "low stability and power margins and poor flight instrumentation".

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The remaining 15% of first-half sales came from the aviation segment, which offers a comprehensive line of panel-mounted and portable products, including completely integrated systems that deliver flight instrumentation, location, navigation, communication and identification data.

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Last month, engines were installed, ground vibration tests and flight test instrumentation verification were completed.

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"We often think of black holes pulling in matter, but actually what we observe with our current instrumentation is matter flying out, " said Timothy Kallman of NASA's Goddard Space Flight Center in Greenbelt, Maryland, in a statement.

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