Boeing 757 Single Aisle Twin Jet Airliner, USA

The Boeing 757 family consists of the 757-200, the 757-200 freighter, and the larger 757-300. Over 1,000 757 aircraft have been delivered. The 757-200 aircraft was announced in 1978 and first flew in 1982. The 757-300, the newest member of the family of medium-sized airliners, is the largest single-aisle twinjet ever made. It took its maiden flight in 1998 and entered service with Condor Flugdienst (now Thomas Cook Airlines, Germany) in 1999. The 757-300 is a stretched version of the 757-200, measuring 23ft 4in (7.1m) longer. The extra length allows it to carry 20% more passengers and increases the available cargo volume by nearly 50%. 62 were built. The 757-200 freighter is designed to accept up to 15 cargo containers on its main deck.

The aircraft has exceptional performance allowing it to operate from almost any airport in the world, including noise-restricted airports, short runways and airports in hot and high locations. It is quiet and fuel-efficient, is environmentally friendly and meets worldwide standards for engine emissions.

In October 2004, Boeing ceased production of the 757 and the final model was delivered to Shanghai Airlines in April 2005. 1,050 757 aircraft were built and 1,030 remain in service around the world.

DESIGN

The aircraft is a low wing, single aisle airliner and carries a high level of commonality with the Boeing 767. The manufacture of several units of the aircraft was subcontracted. Divisions of Boeing built the main sections of the cabin and the flight deck. Other suppliers included: Bombardier Shorts - inboard flaps; EADS CASA - outboard flaps; Hawker de Havilland - inspar ribs of the wings; Fleet Industries - access doors to the auxiliary power unit bay; Heath Tecna - fairings; IAI - the dorsal fin that blends with the main fin; Northrop Grumman - rear fuselage, the fin and tailplane; Rohr Industries - engine support struts; and Schweizer - wingtips.

The wings on the 757-300 and 757-200 are less swept and thicker through the centre than those on earlier Boeing aeroplanes, permitting a longer span. The lower wing surface is slightly flatter and the leading edge is somewhat sharper. This improves lift, reduces drag and makes for improved aerodynamic efficiency and low fuel consumption. The only difference between the 757-300 and the 757-200 wing is that the former is structurally reinforced to handle the increased load.

Both the 757-300 and the 757-200 have the same flight deck and operating systems, but some features have been changed. Besides a lengthened fuselage, changes on the 757-300 include a new interior with vacuum lavatories; new tires, wheels and brakes; a tail skid; and strengthened wings and landing gear.

FLIGHT DECK

The flight deck, which has common crew qualification with the Boeing 767, accommodates the pilot and co-pilot and there is a third seat for an observer.

The flight deck has an integrated Honeywell Pegasus flight management system (FMS). The Pegasus and enhanced engine indication and crew alerting system (EICAS) are now standard on both 757 models. With the Pegasus FMS, operators can choose optional software that enables elements of the future air navigation system (FANS).

A Boeing windshear detection and guidance system is optional.

CABIN

The cabin of the 757-200 provides between 195 and 231 seats in various configurations. A typical arrangement for a two-class flight includes 12 first class seats in a four abreast layout and 189 economy class seats in mainly six abreast layout.

The 757-300 is designed to carry 243 passengers in a mixed-class configuration but can accommodate up to 289 passengers in charter service, putting its capacity between that of the 757-200 and the 767-300.

The cabin is air-conditioned with a Honeywell environmental control system.

ENGINES

The two Rolls Royce or Pratt and Whitney high-bypass-ratio turbofan engines are mounted in underwing pods. The 757-200 is powered by either: Rolls-Royce RB211-535E4 (thrust 40,200lb, 179kN), RB211-535E4B (thrust 43,500lb, 193.5kN), Pratt & Whitney PW2037 (thrust 36,600lb,162.8kN) or PW2040 (thrust 40,100lb,178.4kN).

Engine options for the 757-300 are: Rolls-Royce RB211-535E4B (thrust 43,500lb,193.5kN), Pratt & Whitney PW2037, Pratt & Whitney PW2040, Pratt & Whitney PW2043 (42,600lb,189.4kN).

The engines are fitted with a General Electric thrust management system. The auxiliary power unit is the Honeywell GTCP331-200.

LANDING GEAR

The retractable tricycle landing gear consists of two four-wheel main units and twin-wheel nose unit manufactured by Menasco. The main units are equipped with Goodrich or Dunlop wheels with carbon brakes.

The aircraft's hydraulics system is based on a suite of four Abex electrical pumps and Honeywell-Vickers engine driven pumps.

Boeing team to develop post-737 jet

Only a couple weeks after rolling out the 5,000th 737, Boeing formally named an initial planning team to lead development of a replacement for the Renton-built jet. On Boeing's internal Web site Tuesday, the company announced that Mike Cave, vice president for airplane programs, will direct the work.

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