777-200
The 777-200 was the initial A-market model. The first −200 was delivered to United Airlines on May 15, 1995.[67] With a maximum range of 5,235 nautical miles (9,695 km),[144] the −200 was chiefly aimed at U.S. domestic airline operators.[16] Nine different −200 customers have taken delivery of 88 aircraft,[1] with 68 in airline service as of July 2011.[145] The competing aircraft from Airbus is the A330-300.[146]
[edit]777-200ER
The 777-200ER ("ER" for Extended Range), the B-market version of the −200, was originally known as the 777-200IGW for its increased gross weight.[66] The −200ER features additional fuel capacity and an increased maximum takeoff weight (MTOW) over the −200.[144] Aimed at international airlines operatingtransatlantic routes,[16] the −200ER's maximum range is 7,700 nautical miles (14,300 km).[144] In addition to breaking the eastbound great circle "distance without landing" record, the −200ER also holds the record for the longest ETOPS-related emergency flight diversion (177 minutes under one engine), on a United Airlines flight carrying 255 passengers on March 17, 2003, over the Pacific Ocean.[147][148]
The first −200ER was delivered to British Airways on February 6, 1997.[67] Singapore Airlines, one of the type's largest customers,[1] ordered over half of its −200ERs with reduced engine thrust specifications (de-rated) for use on medium-length routes.[149][150] The de-rated engines lower MTOW, which reduce the aircraft's purchase price and landing fees, and can be re-rated to full −200ER standard for long-haul operations.[149] As of June 2012, −200ER deliveries to 33 different customers totaled 417,[1] ranking the −200ER as the most widely produced variant of the twinjet to date.[65] The newer −300ER variant, however, has accumulated an even larger number of orders.[1] As of July 2011, 428 examples of the −200ER were in airline service.[145] The competing aircraft from Airbus was the A340-300.[151]
0 komentar:
Posting Komentar