 The D.V entered service in May 1917 and structural failures of the lower wing immediately occurred.In 2009, Guttman wrote that "Within the month "Idflieg" was doing belated stress testing and concluding, to its dismay, that the D.V’s sesquiplane wing layout was even more vulnerable than that of its predecessor".The outboard sections of the D.V upper wing also suffered failures, requiring additional wire bracing and the fuselage sometimes cracked during rough landings.