After initial flight trials during May 1909 the rudders were removed.

Ground tests of the prototype began in 2010, and flight trials were initially expected to begin in 2011.

The company was able to carry out extensive flight trials and obtain much valuable data.

The first prototype was completed in December 1937, and flight trials began a month later.

During the flight trial a wooden member failed, resulting in a broken wing.

The flight trials have been spread over 4 missions in both group and autonomous mode.

The prototypes are currently under flight trials as of 2012.

Thus, an important prerequisite for beginning of flight trials was met.

While the initial flight trials were being carried out, the design team examined the lift problem.

In 1987 the Metro aircraft was fitted with the radar system for flight trials.