ETOPS means “extended-range twin-engine operational performance standards.” It is the standard that twin-jet airliners have to achieve to fly on routes over long stretches with few or no airports available for emergency landings, such as when flying over oceans. The first aircraft to make truly long-range ETOPS possible was the Boeing 767. It combined a reliable engine, new engine monitoring, and further technologies recommended by pilots unions and regulatory bodies to fly longer over water safely than any previous twinjets.
Learn more about the history of the 767’s ETOPS and how the jet achieved the certification below. We also cover how ETOPS changed aviation history and continues to have central importance for manufacturers, passengers and airlines alike. After all, the philosophy that drove the 767’s longevity — efficient, long-range twin-jet flying — is the same one that guides cutting-edge aircraft like the Airbus A350 and the Boeing 777X.
Why Twinjet Airliners Weren’t Allowed To Fly Long-Haul Overwater Routes
Federal Aviation Regulation (FAR) 121.161 explains the purpose of ETOPS.
“Unless authorized by the administrator, based on the character of the terrain, the kind of operation, or the performance of the airplane to be used, no certificate holder may operate two-engine airplanes over a route that contains a point farther than 1 hour flying time (in still air at normal cruising speed with one engine inoperative) from an adequate airport.“
The Federal Aviation Administration (FAA) created such rules back when aircraft engines were unreliable, and twin-jets risked engine failure over the ocean at distances too great to make it back to land. Instead, three or four-engine aircraft conducted long flights over water. Things changed with the 767-200ER, the first commercial twin-jet capable of safely operating long-haul overwater routes. Boeing’s director of engineering, Dick Taylor, approached the FAA with this aircraft.
“It’ll be a cold day in hell before I let twins fly long haul, overwater routes,” FAA Administrator Lyn Helms said in 1980.
Helms was particularly safety-oriented, considering the 60-minute limit too generous. It took Donald Engen’s replacement for the FAA to open up to this advancement. Engen, later the head of the National Air & Space Museum, was known for being particularly open-minded.
What Allowed The 767-200ER To Fly Overwater Safely?
The main reason the 767-200ER was capable of long-haul, over-water aviation was the incorporation of modern, computerized systems that provided greater redundancy and efficiency than previous commercial airliners. The jet’s Pratt & Whitney JT9D engine was known for its immensely higher reliability than its contemporaries’. When problems arose, the EICAS (Engine-Indicating and Crew-Alerting System) provided the crew with real-time, detailed performance data essential for fully understanding the engine’s condition before disaster struck. The table below features key specifications for the 767-200ER according to Skybrary.
|
Wingspan |
156.2 feet (47.6 meters) |
|---|---|
|
Powerplant |
2 x P&W PW4062 producing 63,300 lbf (281.6 kN) or 2 x GE CF6-80C2B7F producing 62,100 lbf (276.2 kN) |
|
Range |
6,600 nautical miles (12,223 km) |
|
Length |
159.1 feet (48.5 meters) |
|
Height |
52.2 feet (15.9 meters) |
Extensive cooperation between Boeing and the FAA was also essential to show that the aircraft could safely conduct ETOPS operations. Boeing spent two years collecting vast quantities of data on 767 operations, particularly on engine shutdowns and failures. Further assistance came from a database run by the FAA and the International Civil Aviation Organization in partnership. Boeing used this data to fine-tune the 767 for ETOPS operations and prove that it was safe to do so. Using this data, ICAO, the FAA, the International Federation of Air Line Pilots Association, and the Air Line Pilots Association (ALPA) made several recommendations, including installing a fourth independently powered electrical generator, additional anti-fire features, and additional cooling features.
The History Of The 767’s ETOPS Push
Central to Boeing proving that its aircraft should be trusted with extended ETOPS certification was operators pushing the 767’s range to the limits. El Al Israel Airlines became the first airline to fly the 767 transatlantic, although these flights followed the 60-minute rule. Soon after, El Al, Air Canada, and Trans World Airlines (TWA) gained an exemption, pushing their ETOPS limitation to 75 minutes. Boeing then contributed a large flight from Washington Dulles to Addis Ababa to deliver the 767 to Ethiopian Airlines, which required a one-off ETOPS exemption.
Boeing began lobbying the FAA hard to extend the ETOPS rule to 120 minutes, which would make more transatlantic routes possible. The FAA demanded “statistical maturity,” demonstrating that safe operations were possible over 250,000 consecutive flight hours on passenger flights with few shutdowns.
By February 1985, 120-minute ETOPS limits were deemed acceptable, and TWA flight 810 flew a 767 from Boston to Paris under the new rules. The change allowed TWA to replace its aging Lockheed L-1011 TriStars, which had a fuel burn 7,000 lbs an hour higher than the 767. The final step was to obtain 180-minute ETOPS certification, allowing the 767 to fly between Hawaii and the US mainland. The first such routes began with American Airlines in 1989. By 1993, the entire 767 family, including all variants and engine options, had gained the 180-minute ETOPS extension.
ETOPS Capabilities Opened Hawaii
ETOPS is more than just a technological advancement. It opens remote places to the world. An example is in November 2001, when a Hawaiian Airlines 767-300ER went from no ETOPS approval to receiving permission to fly up to 180 minutes from the nearest airport. This wasn’t the first time an airline had received 180-minute ETOPS approval, but Hawaiian was the first without prior ETOPS approval. It meant that aircraft flying to Hawaii weren’t restricted to quad-jets, making it far easier to enter and leave the Pacific islands.
“This historic achievement is also a milestone in Hawaiian’s history. It signals a new era of greater efficiency and flexibility in our operations as we bring the latest technology in aviation online in our new fleet,” Paul Casey, the airline’s then-Vice Chairman and Chief Executive Officer, explained. “Now, more than ever, as our industry faces unprecedented economic challenges, this new technology is vitally important to our company’s future.”
Boeing was also delighted to have helped Hawaiian to reach this milestone.
“We were able to provide the right product to meet our customers’ needs,” Doug Groseclose, Senior Vice President of International Sales, Boeing Commercial Airplanes, said. “Boeing congratulates Hawaiian Airlines on this great accomplishment, and we look forward to being a part of their continued success.”
Hawaiian Airlines Schedules Boeing 787-9 Dreamliner Flights Between Honolulu & New York-JFK
The carrier will use its newest aircraft to replace the Airbus A330-200 that currently operates the link.
How ETOPS Certification Changed The 767 & The Aviation Industry
ETOPS certification for the 767 fundamentally reshaped the long-haul aviation industry, moving carriers away from three and four-engine aircraft. The legacy is the decline of the 747 and Airbus A380, and the ongoing rise of twin-engine widebody jets like the A350, A330 and 777.
Twin-engine transatlantic operations quickly proved their commercial viability. By 1991, more passengers were crossing the Atlantic on 767s than on three and four-engine aircraft. By 2000, 50% of transatlantic crossings were by 767s. At this time, all new 767s automatically came with 180-minute ETOPS approval.
After four decades of enormously successful service thanks to its role as an ETOPS pioneer, the 767 is now reaching the end of its service life. Both 
Delta Air Lines and 
United Airlines, two carriers that have historically relied on the workhorse, are set to put it out to pasture over the next few years. It is expected that scheduled 767 flights will end by 2030. Under the United Next initiative, the carrier plans to accelerate the retirement of its older aircraft, including the 767.
Despite these retirements, you may still be able to see 767s, even if you can’t fly on them. ch-aviation lists 470 freighter variants of the 767 in active service. FedEx currently operates 120 examples of the 767-300F, while UPS Airlines has 80 examples.
ETOPS Certification Continues To Be A Priority For Boeing Aircraft
Getting ETOPS certification is just as relevant to aircraft manufacturers as it was in the 1980s. An aircraft currently undergoing rigorous ETOPS testing is the 777X, a jet that aims to bring cutting-edge technology to the 777 family. However, with the jet delayed multiple years already, failure to achieve such certification could spell the end of the 777X program.
Yet, ETOPS certification should be a formality at this point. The jets’ GE9X engines received certification in 2020 and have undergone ETOPS testing. One test was an endurance test with the rotors deliberately unbalanced to induce severe vibration. 3,000 ground-test cycles are required for ETOPS approval and entry into service. The 777X as a complete aircraft is considered to be in the final stages of its ETOPS certification journey. When exactly the testing will be complete remains to be seen.
