 Following his completion of duty in the Air Force, Williams was appointed Australia's Director-General of Civil Aviation, serving in the position for almost 10 years. His department was responsible for the expansion of communications and infrastructure to support domestic and international aviation, establishing "an enviable safety record". Williams' tenure coincided with the beginnings of the government carrier Trans Australia Airlines (TAA) and introduction of the Two Airlines Policy, as well as the construction of Adelaide Airport and redevelopment of Sydney Airport as an international facility.
