The FuG 227 Flensburg was a German passive radar receiver developed by Siemens & Halske and introduced into service in early 1944.
It allowed Luftwaffe nightfighters to home in on the Monica tail warning radar fitted to RAF bombers.
An RAF bomber with Monica radar crashed in German-occupied territory in February 1943 allowing for the development of Flensburg.
[1][2] On the morning of 13 July 1944, a Junkers Ju 88G-1 night fighter of 7.Staffel/NJG 2 equipped with Flensburg landed at RAF Woodbridge by mistake and was captured.
[citation needed] This German World War II article is a stub.