Boeing 747-400

The 747-400 is an improved model with increased range. There are extensions of wingtips of 6 feet (1.8 m) and winglets of 6 ft (1.8 m), which improve the efficiency of the fuel type of four percent compared to previous versions of 747. [143] The 747-400 introduced a new glass cockpit designed for a flight crew of two instead of three, with a reduction in the number of dials, gauges and knobs 971 to 365 through the use of electronics. The type also has fuel tanks queue, revised engines, and a new interior. The range has already been used by some airlines to bypass traditional fuel stops, such as Anchorage, Alaska. [144] Power Plants include Pratt & Whitney PW4062, General Electric CF6-80C2, and Rolls-Royce RB211-524 [145].
The -400 was offered in passenger (-400), load (-400F), combination (-400C), national (-400D), extended range passenger (-400ER) and extended range freighter (-400ERF) versions. Passenger versions remain the same as the top cover -300, while the cargo version has a top cover not extended. [146] 747-400D was built for short-haul operations and does not include winglets, but can be adapted to them. [147] Cruising speed Mach 0.855 is up in different versions of the 747-400. [145] [148]

British Airways is the world’s largest operator 747-400. Winglets distinguish most 400 of the above variants.
The passenger version first entered service in February 1989 with the launch customer Northwest Airlines en route from Minneapolis to Phoenix. [78] The combi version entered service in September 1989 with KLM, while the freighter version entered service in November 1993 with Cargolux. The 747-400ERF entered service with Air France in October 2002, while the 747-400ER entered service with Qantas, [149] its only customer, in November 2002. In January 2004, Boeing and Cathay Pacific launched the Boeing 747-400 Freighter program Special [150], later known as the Boeing Converted Freighter (BCF), to modify 747-400 passenger to cargo use. The first 747-400BCFs was presented again in December 2005. [151]
In March 2007, Boeing announced it had no plans to produce new passenger versions of the -400. [152] However, orders for 36-400F freighters and 400ERF already in force at the time of the announcement. [152] The passenger version of the last 747-400 was delivered in April 2005, China Airlines. Some of the built last 747-400 delivered with Dreamliner livery along with the interior of the modern firm Boeing 777. A total of 694 747-400 series aircraft was delivered. [2] On several occasions, the largest operator of the 747-400 was Singapore Airlines, [153] Japan Airlines, [153] or British Airways.

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