11/23/2025
Trans-Canada introduced the Douglas DC-8 Series 40 on its domestic routes on 1 April 1960 and on its trans-Atlantic routes on 1 June 1960.
The DC-8 Series 10 was powered by the Pratt & Whitney JT3C which was the civilian version of the J57 engine. The Series 20 used the P&W JT4A which was the civilian version of the J75 engine. The Series 30 combined the JT4A engines of the Series 20 with a strengthened airframe for higher gross weights, so you could sort of think of the Series 30 as a Series 20ER.
The Series 40 was unusual in that it used the Rolls Royce Conway turbofan.
At the time of its introduction, the Conway was more efficient than either the JT3C or the JT4A, but US airlines didn't get the Series 40 for two reasons- they didn't want a British engine and they were holding out for the JT3D engine (civilian version of the TF33). There were three versions of the Series 40- the standard Series 41, the increased gross weight Series 42, and the even further increased gross weight Series 43 which had a 4% leading edge extension on the wings which improved the aerodynamics as well as provide a bit more space for fuel tanks.
Only 32 of the Series 40s were built and only three airlines ordered the Conway DC-8s- TCA, Canadian Pacific, and Alitalia.
Trans-Canada took delivery of all three variants of the Series 40- four Series 41s, four Series 42s, and three Series 43s- DC-8-41s (CF-TJA, -TJB, -TJC, and TJD), four DC-8-42s (CF-TJE, -TJF, -TJG, and -TJH) and three DC-8-43s (CF-TJJ, -TJK, and -TJL) . They were all delivered 1960-1961 before TCA switched to the DC-8 Series 54 (1963 onward and it had the P&W JT3D engine) with the first Super 61 arriving in 1967.
Of course, 1965 is when Trans Canada was rebranded as Air Canada.
The Series 40s with their older engines were the first DC-8s to leave the airline being withdrawn from September 1975 to June 1979.