According to German prosecutors, a man in his underwear broke into and boarded an empty plane frequently used by Chancellor Angela Merkel, while it was parked at a closed military area of the Cologne airport last month.
The 24-year-old intruder reportedly had a bag of pot and ecstasy pills with him while he partied in the jet. He sprayed foam inside, played with buttons in the cockpit and even danced on the wing of the Airbus 319.
He even used the escape slide and the fire extinguishers before police found and arrested him.
A spokesman for Germany's air force said Tuesday they were investigating the incident which occurred on July 25.
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The spokesman, who spoke on condition of anonymity, told the Associated Press said the man was able to enter the airfield because the alarm system has been disabled because of construction.
German media identified the man as Turkish bodybuilder Volkan T.
The plane is also frequently used by other top German officials including President Joachim Gauck.