Alfredo has described the 400 improvements over the classic 747. The following excerpt from AWST describes the 747-400ER as you requested.
The -400ER has a maximum takeoff weight of 910,000 lb.--an increase of 35,000 lb. over the standard -400--to enable operators to fly the greater distance or carry up to 15,000 lb. more in passenger or cargo payload.
The aircraft will have an upgraded interior, an auxiliary fuel tank and a second optional auxiliary tank in the forward cargo compartment. It will also have strengthened fuselage, landing gear and wing components in addition to new and larger tires. The cockpit will have liquid-crystal displays and noise-reduction modifications.
SO FAR, QANTAS IS THE ONLY customer for the 747-400ER passenger aircraft, although a total of nine freighters have been ordered to date. The freighter, called the 747-400ERF, has a maximum takeoff weight of 910,000 lb. and, compared to the 747-400, can fly an extra 525 naut. mi., or carry an additional 22,000 lb. of payload on long-range flights at maximum takeoff weight. The freighter version was launched in April 2001.
Boeing today is offering four 747 versions: the 747-400 and -400ER passenger models and the 747-400F and -400ERF dedicated cargo transports. With a 747-XQLR launch, the -400ER passenger aircraft could be folded into the XQLR model.
Kurt Kraft, Boeing program manager for the Longer Range 747-400, said the first 747-400ER has been towed to the flight line where it will undergo a series of ground tests prior to first flight. Flight testing is scheduled to begin in the third week of July and continue through mid-October. Two flight test aircraft are expected to accumulate about 240 hr. of flight testing in addition to a total of about 410 hr. of ground tests.
The first 747-400ER to be delivered will be the second off the production line, with initial delivery to Qantas set for the third week in October after a short flight test program to certify the new interior. The second delivery to the airline, the aircraft just rolled out, will be made the following month.
Completion of the first 747-400ERF freighter is scheduled for August, with delivery to Air France in October after a brief series of flight tests.
Kraft said no 747-400ER deliveries have been delayed or canceled in the aftermath of Sept. 11, adding that a few orders have been added to the program and that Qantas has accelerated its delivery schedule.
Corky Townsend, Boeing 747-400XQLR program manager, said the XQ version of the aircraft would be based on the current 747-400 model with a maximum takeoff weight of 875,000 lb., with the aircraft capable of meeting QC2 limits.
©June 24, 2002, The McGraw-Hill Companies Inc.