(PilotsEYE.tv/YouTube screen capture)
(PilotsEYE.tv/YouTube screen capture)

Officials at San Francisco International Airport are alerting the public that their flights might be delayed — for about four months later this year.

A pair of the airport’s shorter runways will be shut down from May to September to allow installation of new pavement designed to, in the airport’s words, “safely capture an aircraft’s landing gear should it overshoot the airstrip.”

In an advisory, the airport says that all arriving and departing traffic will use Runways 10R-28L and 10L-28R. During good weather, minor delays might occur during peak periods of traffic demand, such as 9 a.m. to noon. More significant delays will occur during bad weather — say, during very foggy or windy conditions.

The work on Runways 1R and 1L is being done under a Federal Aviation Administration program to improve what the agency calls runway safety areas at the nation’s commercial airports. The safety areas are essentially emergency-stop zones for planes that approach the end of runways on landings or aborted takeoffs.

Since SFO doesn’t have enough room for the full 1,000-foot runway safety area extension mandated in the FAA rules, the airport is installing an “engineered material arresting system” designed to slow down and stop planes that overrun the end of a runway.

The material’s manufacturer, Engineered Arresting Systems Corp., describes what it is and how it’s supposed to work: “EMAS is consisted of a bed of cellular cement material manufactured in the form of engineered block components that are strategically placed at the overrun end of a runway. The EMAS predictably and reliably crushes under the weight of an aircraft, providing deceleration and a safe stop.”

The company also says the material can be installed around “high-value public and private buildings” to stop “threat vehicles.” A truck carrying explosives, say.

The arresting systems already have saved some planes, including a couple of commercial flights full of passengers: a Mexicana Airlines Airbus A320 at Chicago’s O’Hare International Airport in 2008; a PSA Airlines Bombardier CJR200 in West Virginia in 2010; and, perhaps most spectacularly, a 747 cargo jet at JFK in New York City in 2005.

Aspiring EMAS nerds need to watch the video below from the manufacturer. It actually does a great job explaining how the system works, complete with video from a live test with a real airliner.


Dan Brekke

Dan Brekke is a blogger, reporter and editor for KQED News, responsible for online breaking news coverage of topics ranging from California water issues to the Bay Area's transportation challenges. In a newsroom career that began in Chicago in 1972, Dan has worked as a city and foreign/national editor for The San Francisco Examiner, editor at Wired News, deputy editor at Wired magazine, managing editor at TechTV as well as for several Web startups.

Since joining KQED in 2007, Dan has reported, edited and produced both radio and online features and breaking news pieces. He has shared in two Society of Professional Journalists Norcal Excellence in Journalism awards — for his 2012 reporting on a KQED Science series on water and power in California, and in 2014, for KQED's comprehensive reporting on the south Napa earthquake.

In addition to his 44 years of on-the-job education, Dan is a lifelong student of history and is still pursuing an undergraduate degree.

Email Dan at: dbrekke@kqed.org

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