Crash! Pilots pay more attention when relying on your auto pilot!

Automation has changed the relationship between airline pilots and planes, presenting new challenges.

Automation has changed the relationship between airline pilots and planes, presenting new challenges.

The pilots aboard the Asiana Airlines Boeing 777 that crashed in San Francisco relied on automatic equipment – an auto-throttle system – to maintain airspeed and did not realize the plane was flying too slowly until it was just 200 feet above the ground, the head of the U.S. National Transportation Safety Board said.

Automated flight controls in airline cockpits have become so reliable that safety experts say pilots could become inattentive to rare malfunctions that can lead to crashes.

Increasing automation has been a tremendous safety boon to aviation, contributing to historically low accident rates in the U.S. and many parts of the world.

Pilots today typically use their โ€œstick and rudderโ€ flying skills only for brief minutes or even seconds during takeoffs and landings. Mostly, they manage computer systems that can fly planes more precisely and use less fuel than a human pilot can. But humans simply arenโ€™t wired to pay close and continual attention to systems that rarely fail or do something unexpected.

โ€œOnce you see youโ€™re not needed, you tune out,โ€ said Michael Barr, a former Air Force pilot and accident investigator who teaches aviation safety at the University of Southern California. โ€œAs long as everything goes OK, weโ€™re along for the ride. Weโ€™re a piece of luggage.โ€

The National Transportation Safety Board will hold an investigative hearing Tuesday and Wednesday on the crash of an Asiana Airlines jet that was flying too low and slow while trying to land at San Francisco International Airport last July.

The plane struck a seawall just short of the runway, shearing off its tail and sending the rest of the airliner sliding and turning down the runway before breaking apart and catching fire. Three passengers were killed and scores of others injured.

The hearing will focus on โ€œpilot awareness in a highly automated aircraft,โ€ the board said.

Investigators want to know how the three seasoned pilots allowed a passenger jet with no apparent mechanical problems in near-perfect weather conditions to lose speed so dramatically that it was on the brink of stalling moments before the crash.

The pilot flying the plane was attempting to land without use of the autopilot. Normally, the pilot in the second seat is supposed to have his eyes on the planeโ€™s computer screens to monitor airspeed and other readings, rather than looking out the window.

In this case, the second pilot was a training captain who was grading the performance of the pilot flying the plane. The training captain told investigators he thought the planeโ€™s autothrottle was maintaining engine power and thus speed, but discovered that wasnโ€™t the case just moments before the crash.

The autothrottle was โ€œarmed,โ€ or made ready for activation, investigators said in briefings after the accident, but they left open the question of whether it was engaged and in idle or another mode.
Aircraft systems can have many modes, or settings, and perform quite differently depending upon the mode.

Pilot โ€œmode awarenessโ€ is a more common automation-related problem showing up in accidents and incidents, according to an automation study released last month by the Federal Aviation Administration. Mode changes occur frequently during flight, often without any direct action by pilots. If pilots arenโ€™t continually paying close attention, they can lose track of which mode their systems are in.

Pilots also make mistakes when selecting modes. Mode selection errors were cited in 27 percent of the accidents reviewed in the FAA study.

Less than six weeks after the Asiana crash, a United Parcel Service cargo jet flying too low while trying to land in Birmingham, Ala., struck trees and a power line before crashing into a hillside near the airport. Both pilots were killed.

In that case the autopilot was on, and seconds before the crash there was a loud automated warning that the plane was losing altitude too rapidly, according to investigators. The investigation is continuing, but some safety experts see a possible link between the two accidents.

โ€œI think mode awareness is going to be very central in both investigations,โ€ said John Cox, an aviation safety consultant and former accident investigator for the Air Line Pilots Association. โ€œIn both cases, the airplane appears to have been properly maintained, everybody is properly trained. A lot of the focus is on how the crew operated the airplane so that it ended up with the airplane short of the runway.โ€
The Asiana accident was the first fatal crash of a passenger airline in the U.S. since a regional airline pilot lost control of his plane during a landing approach in Buffalo, N.Y., in February 2009. In that crash, investigators found the two pilots werenโ€™t closely monitoring airspeed and failed to notice when the speed began dropping rapidly.

The plane plummeted to the ground, killing all 49 people on board and a man in a house below.

There was nothing mechanically wrong with the plane, and the captain should have been able to regain control of the plane if he had responded correctly to an automated stall warning, investigators said. Such โ€œloss of controlโ€ accidents accounted for 43 percent of fatal passenger airline and air cargo accidents over the five years that ended in December 2012, according to the International Air Transport Association, which represents carriers around the world.

Last month, the FAA issued new pilot training regulations calling for more attention to teaching pilots how to recover from stalls.

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Avatar of Linda Hohnholz

Linda Hohnholz

Editor in chief for eTurboNews based in the eTN HQ.

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