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"I was a bit unlucky because my parachute when it opened was attached to the tail plane," Stirling said decades later.

Questions were raised in parliament about one of the designs, which featured a Nazi swastika on the tail plane of a German bomber.

The FAA's concerns center on the lack of an anti-corrosive coating on pins used to attach the 737s' horizontal stabiliser – also known as the tail plane.

Within four feet of the tail plane Ralph halted.

Moreover, the aircraft's efficiency is further improved by simultaneously rotating the tail plane to the same oblique position.