By contrast, the only heavy bomber to enter service with the Luftwaffe during the war years – the Heinkel He 177 Greif – turned out to be one of the most troublesome German wartime aircraft designs, plagued with numerous engine fires from both its inadequate engine accommodation design and its general airframe design being mis-tasked, for a 30-meter (100 ft) class wingspan design, to be built to be able to perform moderate-angle dive bombing attacks from the moment of its approval by the RLM in early November 1937, which would not be rescinded until September 1942.[2]