If a plane loses an engine over the ocean, the flight continues. Modern commercial aircraft are designed to fly safely on one engine, and every transoceanic route is planned so the plane is never more than a set number of minutes from a suitable airport. A total loss of all engines is extraordinarily rare, but even then, a commercial jet doesn’t drop out of the sky. It glides, giving pilots significant time and distance to work with.
One Engine Out: What Pilots Do First
The moment an engine fails or is shut down at cruising altitude, the pilots’ immediate job is managing the asymmetry. With thrust coming from only one side of the aircraft, the plane wants to yaw, or turn, toward the dead engine. Pilots counteract this with rudder input and trim the aircraft to fly straight. They then set the remaining engine to maximum continuous thrust.
Because a twin-engine jet can’t maintain its original cruising altitude on one engine, the plane begins what’s called a driftdown procedure. Instead of a rapid descent, the aircraft gradually loses altitude while maintaining the best possible forward speed. The plane holds its cruising altitude as long as it can while speed slowly decays, then descends at a controlled rate until it reaches the highest altitude one engine can sustain. For most wide-body jets, this stabilizes somewhere between 15,000 and 25,000 feet depending on the aircraft’s weight, temperature, and conditions. It’s a smooth, controlled process that passengers might barely notice beyond the initial announcement from the cockpit.
How Routes Are Planned for This Exact Scenario
No airline flies a twin-engine plane across an ocean without a certification called ETOPS (Extended-range Twin-engine Operations Performance Standards). ETOPS ratings dictate the maximum number of minutes a plane can be from a diversion airport while flying on one engine. The FAA grants these in tiers: 75, 90, 120, 138, 180, 207, and 240 minutes, with some routes approved for even longer. Each tier requires progressively stricter maintenance, crew training, and aircraft reliability standards.
A 180-minute ETOPS rating, common for transatlantic flights, means the route is planned so the aircraft is never more than three hours from a suitable runway on a single engine. For remote Pacific crossings, 240-minute ratings extend that window to four hours. The practical result is that every minute of a transoceanic flight has a “what if” answer already built into the flight plan. Pilots carry a list of diversion airports for their route, and if an engine fails, they simply execute the turn toward the nearest one.
How Rare Engine Failure Actually Is
A jet engine fails approximately once every 375,000 flight hours. That’s roughly once every 43 years of continuous operation. Losing both engines simultaneously is almost unheard of outside of fuel exhaustion or volcanic ash encounters, both of which are preventable through proper planning. The reliability of modern turbofan engines is the reason regulators became comfortable certifying twin-engine jets for oceanic routes in the first place.
What Happens If Both Engines Fail
Even in the worst case, a commercial jet becomes a glider. A Boeing 747 has a glide ratio of about 17 to 1, meaning for every 1,000 feet of altitude it loses, it travels roughly 17,000 feet (just over three miles) forward. From a typical cruising altitude of 35,000 feet, that translates to about 100 miles of gliding distance with no engines at all. Smaller wide-bodies like the Airbus A330 have similar ratios.
In 2001, Air Transat Flight 236, an Airbus A330, lost both engines over the Atlantic due to a fuel leak. The crew glided the aircraft 65 nautical miles and landed safely at a military base in the Azores. Every passenger survived. This case demonstrated what engineers already knew: commercial jets are aerodynamically capable of long, controlled glides.
During a total power loss, a small device called a ram air turbine deploys from the fuselage or wing. It’s a miniature turbine, powered by the airstream rushing past the aircraft, that provides emergency hydraulic and electrical power. It keeps flight controls, critical instruments, navigation, and communication equipment running. On some aircraft it deploys automatically the moment all primary power is lost; on others, pilots deploy it manually.
How Pilots Communicate Over Open Ocean
Over the middle of an ocean, standard VHF radio doesn’t reach air traffic control. Pilots on oceanic routes use a text-based system called Controller Pilot Data Link Communications (CPDLC), which transmits messages via satellite. When CPDLC is available and the aircraft is outside VHF range, it serves as the primary communication method. High-frequency radio and satellite voice communication act as backups.
If there’s an emergency, pilots can transmit standardized distress messages through the data link system, including digital MAYDAY and PAN PAN alerts that immediately flag the situation to oceanic controllers. This means that even thousands of miles from shore, air traffic control knows about an engine failure within seconds and can begin coordinating a diversion route or, in the most extreme case, alerting search and rescue.
Survival Equipment on Overwater Flights
Federal regulations require specific survival gear on any flight more than 100 nautical miles (or 30 minutes of flying time) from shore. Every passenger must have a life preserver equipped with a locator light. The aircraft must carry enough life rafts to hold everyone on board, each fitted with its own locator light. At least one pyrotechnic signaling device per raft is required, along with a portable, water-resistant emergency radio that works independently of the aircraft’s power. Each raft also carries a survival kit appropriate for the route being flown, and a lifeline.
All of this equipment must be stored in clearly marked, easily accessible locations so it can be reached quickly during a ditching without lengthy preparation. For flights more than 50 nautical miles from shore but under the 100-mile threshold, a life preserver or flotation device for each person is still mandatory.
What a Water Landing Actually Looks Like
A controlled ditching, while extremely rare, follows well-established principles. Pilots slow the aircraft to near-stall speed, keep the nose slightly up and the tail down, and aim to land into the wind. The goal is to touch down on the top or backside of an ocean swell while flying parallel to the wave crests. The FAA’s guidance includes a simple rule: avoid the face of a swell. Landing into the rising wall of a wave dramatically increases impact forces, while setting down on the back slope is closer to a firm runway landing.
Landing gear stays retracted for a water landing. Extended wheels would catch the water and flip the aircraft. With gear up and a proper approach angle, the fuselage acts as a hull, and the plane decelerates on the surface. The aircraft’s structural integrity during those first seconds determines how much time passengers have to evacuate onto rafts. Modern wide-body fuselages are designed to remain intact and buoyant long enough for a full evacuation.
Twin-Engine vs. Four-Engine Planes
You might assume a four-engine plane like the Boeing 747 or Airbus A380 is inherently safer over oceans. Losing one of four engines leaves three still running, which means no driftdown is needed and the plane can often continue to its destination. A twin-engine plane losing one engine loses half its thrust and must divert.
In practice, the safety margins are comparable. Twin-engine jets certified for ETOPS undergo more rigorous maintenance schedules and reliability tracking than four-engine aircraft. Their engines are held to higher individual reliability standards precisely because each one matters more. The certification requirements ensure that a twin-engine plane on one engine can still achieve specified minimum climb rates and clear obstacles. The overall safety record of ETOPS operations reflects this: decades of transoceanic twin-engine flying have produced an excellent safety record, which is why four-engine jets are being retired from most routes in favor of more fuel-efficient twins like the Boeing 787 and Airbus A350.