Source: AEROPLANE SEPTEMBER 2020, page 123[...]Pure jet 748s were considered, too. One strand of development envisaged aircraft with two, three or even four rear-mounted engines. In 1976 Hawker Siddeley announced it was looking at a 748 variant with a pair of Rolls-Royce M45H turbofans mounted above the wings, as on the VFW-Fokker 614. It was envisaged that the aircraft, designated as the 748 Series 5,would have accommodated up to 64 passengers. An alternative study proposed the substitution of Avco Lycoming ALF502s.[...]