The Airbus A340, a long-range wide-body quad-engine passenger airliner, was developed alongside the twin-engine Airbus A330 in the 1980s. The first model, the Airbus A340-300, took its maiden flight on October 25, 1991. It entered commercial service in 1993 with Lufthansa and Air France. Later models included the larger A340-500 and A340-600 variants, introduced in 1997 and 2002.
The aircraft’s design featured four CFM 56 engines for early models and Rolls-Royce Trent 500 engines for later ones. This configuration allowed it to bypass restrictions that limited twin-engine jets from long-haul overwater flights due to safety regulations by aerospace agencies. The aircraft also had a three-leg main landing gear for higher maximum takeoff weight compared to its contemporaries.
Despite these advantages, the A340 struggled against more efficient twinjets like Boeing’s 777 due to its less economical four-engine design. Only 377 units were produced, with one variant performing particularly poorly in sales.
“Restrictions put in place by aerospace regulatory agencies significantly restricted how far twin-engine jets could fly,” which influenced Airbus’s decision to build a four-engine aircraft when planning began for the A340 program.
Almost immediately after launching the original two models of the Airbus A340, “the family was immediately dealt a massive blow” when ETOPS regulations changed in favor of twin-engine planes like Boeing’s new offerings. However, at that time, Airbus had secured enough orders to ensure profitability for its program.
Ultimately, while “the Airbus A340 was harmed by twin-engine operational regulations being relaxed,” this shift benefited its sibling model—the highly successful twin-engine Airbus A330.
