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Emirates Finalises 777 Order


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Dubai airline Emirates finalized a $56-billion (32.73 billion pounds) order to buy 150 Boeing <BA.N> 777X jets on Wednesday, firming up a commitment made last year, just weeks after scrapping an order with rival plane maker Airbus <AIR.PA>.

The deal includes purchase rights for an additional 50 airplanes which, if exercised, could increase the value to about $75-billion at list prices, Boeing said in a statement.

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Boeing Folding Wingtip for the 777X

Watch: Boeing 777X Folding Wingtip

Oct 31, 2016Guy Norris  | Aviation Week & Space Technology

Aviation Week editors recently saw a demonstration of the folding wingtip at Boeing’s plant in Everett, Washington. The target time for extending and/or retracting the wingtip is 20 sec. Listen closely when it reaches the selected position to hear the locking mechanisms engage:

Video credit: Joe Anselmo/Aviation Week & Space Technology

The 777X extendable wingtip is very different from Boeing’s original 777 wing fold (see diagram below), which was developed in the early 1990s to enable to the 777 to fit into smaller DC-10-sized gates at airports like Chicago and Dallas/Fort Worth. The changeable span feature on the 777X is designed for better cruise performance while, at the same time, permitting ground operations at today’s 777-compatible airports.

Boeing 777 wing fold diagram

The original 777 wing fold was heavy and complex. Based on a design used in the U.S. Navy’s Northrop Grumman A-6 Intruder, it was developed by E-Systems’ Montek Division and Frisby Airborne Hydraulics. The hinge line was located at 80% of the span, allowing the outer 21 ft., 3 in. to lift up. The fold was designed with a piano-like hinge on the upper wing surface and a lug-and-clevis on the lower surface. Hydraulically actuated latch pins were driven through the lug and clevis to transfer loads when the wingtips were extended. For safety reasons, the wing fold could only be operated on the ground when the aircraft was traveling 50 kt. or less.

No airline ever opted for this wing-fold design, which never saw service. All new 777Xs, on the other hand, will come with a folding wingtip as standard.


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