MD-11

MD-11
Name	MD-11
Caption	A Swissair MD-11 in flight
Type	Wide-body jet airliner
National origin	United States
Manufacturer	McDonnell Douglas
First flight	January 10, 1990
Introduction	December 1990 with Finnair
Status	In limited passenger service; primarily cargo operations
Primary users	FedEx Express
Number built	200
Developed from	McDonnell Douglas DC-10

MD-11. The McDonnell Douglas MD-11 is a three-engine, long-range, wide-body jet airliner developed from the McDonnell Douglas DC-10. It entered service in 1990 with Finnair, featuring advanced glass cockpit technology, increased use of composite materials, and greater fuel efficiency than its predecessor. Although production ended in 2001 after Boeing's merger with McDonnell Douglas, the type remains a significant asset in global freight fleets.

Development and design

The program was launched in December 1986 as a major development of the McDonnell Douglas DC-10, aimed at competing with new offerings from Airbus and Boeing. Key design goals included a longer fuselage, increased gross weight, and the adoption of a two-person glass cockpit derived from the MD-88, which eliminated the need for a flight engineer. Advanced CF6-80C2 or Pratt & Whitney PW4000 engines, along with winglets, were incorporated to improve fuel economy and range. Despite these innovations, the aircraft did not fully meet its original range specifications, which impacted early sales campaigns against the rival Airbus A340 and Boeing 777.

Operational history

Finnair became the launch customer, placing the MD-11 into revenue service on its Helsinki route network. Other major initial operators included American Airlines, Delta Air Lines, and Swissair, who deployed it on transatlantic and transpacific routes. The aircraft's performance shortfalls, however, led several carriers like American Airlines to reconfigure their fleets for shorter missions or retire them early in favor of Boeing 777 aircraft. The Federal Aviation Administration and European Aviation Safety Agency have continuously certified the type, with a major second life beginning in the early 2000s as passenger models were converted to freighters for operators such as FedEx Express and UPS Airlines.

Variants

The primary passenger version was the MD-11 (or MD-11P), while the MD-11F was a factory-built freighter. The MD-11C was a convertible "Combi" model capable of carrying both passengers and cargo on the main deck, operated by airlines like Alitalia. An extended-range MD-11ER variant was offered with increased takeoff weight and additional fuel capacity. Following the end of production, firms like Israel Aerospace Industries and Boeing developed popular conversion programs to modify retired passenger airframes into dedicated freighters for the cargo airline market.

Operators

As of recent years, the largest operator is the American cargo giant FedEx Express, which flies a large fleet of MD-11F freighters. Other significant cargo carriers include UPS Airlines, Western Global Airlines, and Lufthansa Cargo. A very small number remain in passenger service with specialized operators such as Iran Air and the Royal Saudi Air Force. The aircraft is also commonly used by civilian contractors like World Atlantic Airlines for charter operations and by NASA for specialized research missions, including as a carrier aircraft for the SOFIA airborne observatory.

Accidents and incidents

The MD-11 has been involved in several notable accidents. In July 1993, a China Eastern Airlines flight crashed near Hong Kong during a go-around in a storm. In September 1997, a FedEx Express MD-11F crashed in Newark during a training flight. The most catastrophic event was the crash of Swissair Flight 111 off the coast of Halifax in September 1998, which led to major safety recommendations from the Transportation Safety Board of Canada and the National Transportation Safety Board regarding in-flight fire prevention. These events contributed to enhanced training and modifications across the fleet.

Specifications (MD-11)

The MD-11 is typically powered by three Pratt & Whitney PW4000 or General Electric CF6 turbofan engines. It has a length of 61.2 meters, a wingspan of 51.7 meters with winglets, and a tail height of 17.6 meters. Maximum takeoff weight ranges up to 286,000 kg for the ER variant. The standard three-class layout accommodates around 298 passengers, with a range of approximately 12,630 kilometers. Its design incorporates a fly-by-wire system for the rudder and improved auxiliary power unit systems compared to the McDonnell Douglas DC-10.

Category:Airliners Category:Trijet aircraft Category:United States airliners 1990–1999