Advances in sensor technology, computing and artificial intelligence are making human pilots less necessary than ever in the cockpit. Government agencies are experimenting with replacing the co-pilot, perhaps even both pilots on cargo planes, with robots or remote operators.

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MOUNTAIN VIEW, Calif. — Mounting evidence that the co-pilot crashed a Germanwings plane into a French mountain has prompted a global debate about how to better screen crew members for mental illness and how to ensure that no one is left alone in the cockpit.

But among many aviation experts, the discussion has taken a different turn. How many human pilots, some wonder, are really necessary aboard commercial planes?

One? None?

Advances in sensor technology, computing and artificial intelligence are making human pilots less necessary than ever in the cockpit. Already, government agencies are experimenting with replacing the co-pilot, perhaps even both pilots on cargo planes, with robots or remote operators.

“The industry is starting to come out and say we are willing to put our R & D money into that,” said Parimal Kopardekar, manager of the safe autonomous-system-operations project at NASA’s Ames Research Center.

In 2014, airlines carried 838.4 million passengers on more than 8.5 million flights. Commercial aviation is already heavily automated. Modern aircraft are generally flown by a computer autopilot that tracks its position using motion sensors and dead reckoning, corrected as necessary by GPS. Software systems are also used to land commercial aircraft.

In a recent survey of airline pilots, those operating Boeing 777s reported that they spent just seven minutes manually piloting their planes in a typical flight. Pilots operating Airbus planes spent half that time.

And commercial planes are becoming smarter all the time. “An Airbus airliner knows enough not to fly into a mountain,” said David Mindell, a Massachusetts Institute of Technology aeronautics and astronautics professor. “It has a warning system that tells a pilot. But it doesn’t take over.”

Such a system could take over, if permitted. Already, the Pentagon has deployed automated-piloting software in F-16 fighter jets. The Auto Collision Ground Avoidance System reportedly saved a plane and pilot in November during a combat mission against Islamic State group forces.

The Pentagon has invested heavily in robot aircraft. As of 2013, there were more than 11,000 drones in the military arsenal. But drones are almost always remotely piloted, rather than autonomous. Indeed, more than 150 humans are involved in the average combat mission flown by a drone.

This summer, the Defense Advanced Research Projects Agency, the Pentagon research organization, will take the next step in plane automation with the Aircrew Labor In-Cockpit Automation System, or ALIAS. Sometime this year, the agency will begin flight testing a robot that can be quickly installed in the right seat of military aircraft to act as the co-pilot. The portable onboard robot will be able to speak, listen, manipulate flight controls and read instruments.

The machine, a bit like R2D2, will have many of the skills of a human pilot, including the ability to land the plane and to take off. It will assist the human pilot on routine flights and be able to take over the flight in emergency situations.

Competing teams

A number of aerospace companies and universities, in three competing teams, are working to develop the robot. The agency plans for the robot co-pilot to be “visually aware” in the cockpit and to be able to control the aircraft by manipulating equipment built for human hands, such as the pilot’s yoke and pedals, as well as the various knobs, toggles and buttons.

Ideally, the robots will rely on voice-recognition technologies and speech synthesis to communicate with human pilots and flight controllers.

“This is really about how we can foster a new kind of automation structured around augmenting the human,” said Daniel Patt, a program manager in DARPA’s Tactical Technology Office.

NASA is exploring a related possibility: moving the co-pilot out of the cockpit on commercial flights, and instead using a single remote operator to serve as co-pilot for multiple aircraft.

Ground controller

In this scenario, a ground controller might operate as a dispatcher managing a dozen or more flights simultaneously. It would be possible for the ground controller to “beam” into individual planes when needed and to land a plane remotely in the event that the pilot became incapacitated — or worse.

What the Germanwings crash “has done has elevated the question of should there or not be ways to externally control commercial aircraft,” said Mary Cummings, the director of the Humans and Autonomy Laboratory at Duke University and a former Navy F-18 pilot, who is a researcher on the DARPA project.

“Could we have a single-pilot aircraft with the ability to remotely control the aircraft from the ground that is safer than today’s systems? The answer is yes.”

The potential savings from the move to more autonomous aircraft and air traffic control systems is enormous.

In 2007, a research report for NASA estimated that the labor costs related to the co-pilot position alone in the world’s passenger aircraft amounted to billions of dollars annually.

Automating that job may save money. But will passengers ever set foot on plane piloted by robots?

“You need humans where you have humans,” Cummings said. “If you have a bunch of humans on an aircraft, you’re going to need a Captain Kirk on the plane. I don’t ever see commercial transportation going over to drones.”

In written testimony submitted to the Senate last month, the Air Line Pilots Association warned, “It is vitally important that the pressure to capitalize on the technology not lead to an incomplete safety analysis of the aircraft and operations.”

Human pilots lauded

The association defended the unique skills of a human pilot: “A pilot on board an aircraft can see, feel, smell or hear many indications of an impending problem and begin to formulate a course of action before even sophisticated sensors and indicators provide positive indications of trouble.”

Even at NASA’s recent symposium, experts worried over the deployment of increasingly autonomous systems. Not all of the scientists and engineers who attended believe that increasingly sophisticated planes will always be safer planes.

“Technology can have costs of its own,” said Amy Pritchett, an associate professor of aerospace engineering at the Georgia Institute of Technology. “If you put more technology in the cockpit, you have more technology that can fail.”