Monica was developed at the
Bomber Support Development Unit (BSDU) in
Worcestershire. After the
Luftwaffe became aware of Monica from a crashed bomber, German scientists developed a passive radar
receiver, named
Flensburg (FuG 227). From early 1944, FuG 227 was used by
nightfighter crews to home in on Allied bombers using Monica. However, on the morning of 13 July 1944, a 7.
Staffel/
NJG 2-flown
Junkers Ju 88 G-1 nightfighter equipped with Flensburg mistakenly landed at
RAF Woodbridge. After examining the Flensburg equipment, the RAF ordered Monica withdrawn from all
Bomber Command aircraft. An AN/APS-13 was used as a
radar altimeter during the
Atomic bombings of Hiroshima and Nagasaki by the
509th Composite Group, USAAF. ==See also==