ln the beginning of З0s it was appeared in the world an idea of high-speed bomber that could outst ip contemporary fighters. Оne of the objectifications of this conception became the twin-engine bomber Do 17 designed bу а German Dornier Flugzeugwerke company.
Since the beginning of 1939 it were produced Do 17Z planes with new “Waffenkopf ” type nose part and air-cooled Bramo 323 Fafnir engines.
ln 1940 it were produced 9 Do 17Z-10 Kauz 11 night fighters. Spanner-Anlage infrared night vision devices were installed in these planes with powerful armament . They served in the night fighter unit 11/ NJG 1 up to the beginning of 1941.