updated 11/4/2006 6:33:47 PM ET 2006-11-04T23:33:47

To an experienced pilot, Runway 29 at Newark Liberty International Airport is hard to miss. It is half a football field wide, and like all jet runways, is marked by white lights on each side and down its center line.

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All of which has left some aviation officials surprised and alarmed that a Boeing 757 mistakenly landed on an adjacent taxiway last weekend.

Aviation experts said the incident last Saturday night points up the potential for tragedy and the need for better runway safety technology.

“It’s an incredibly dangerous thing,” said Justin Green, a New York lawyer specializing in aviation litigation and a former Marine accident investigator.

Over the years, airliners have taken off or landed on the wrong runway; in August, for example, 49 people were killed when a commuter jet made a wrong turn and took off from a too-short runway in Lexington, Ky.

It is rare for a jet to set down on a taxiway, however. Seattle-Tacoma International Airport, for instance, had three such landings over a recent four-year span. Officials there issued special warnings to pilots and painted a 25-by-25-foot “X” near the end of a taxiway.

The National Transportation Safety Board is investigating last weekend’s incident, which involved a Continental Airlines flight carrying 154 people from Orlando, Fla. Both pilots have been grounded by the airline.

The NTSB said Thursday it was still awaiting statements from members of the flight crew. Jill Andrews, who is leading the investigation, said it was up to Continental to decide whether to test the pilots for drugs or alcohol. A Continental spokeswoman had no comment. The names of the pilots have not been released.

MISSED RUNWAY

The plane set down on a taxiway that runs parallel to the runway and is close to it. The taxiway is used to tow airplanes between parking areas and other parts of the airport, and smaller vehicles use the area just off the taxiway to move other equipment. Hangars are nearby.

According to the NTSB’s preliminary report, Flight 1883 was initially cleared for an approach to Runway 22L. Runway 22L is equipped with an Instrument Landing System, which displays in the cockpit whether a plane is lined up with the middle of the runway. The plane was then directed to turn and land on Runway 29, which is not equipped with ILS; pilots line up the plane visually.

The “ILS circling approach” to Runway 29 is common, according to Russ Halleran, president of the air traffic controllers union at Newark. Planes are often ordered to land on that runway when there are strong crosswinds from the west, as there were on Saturday.

That could present a challenge to pilots, particularly if they are unfamiliar with the airport’s layout, some experts said. Saturday’s landing also occurred at dusk, which could have been a factor, they said.

“Being cleared to land on a different runway than the one you are flying the approach to introduces a whole new set of complexities to the pilots at a very critical time, especially when the landing runway does not have a precision approach,” said Denis Breslin, an American Airlines pilot and spokesman for the Allied Pilots Association, the airline pilots union.

According to Halleran, one reason Runway 29 is not equipped with an ILS is that because of restrictions above the Hudson River and Port Newark to the east of the airport, there is not enough airspace to get a plane’s position established in time.

Two systems that employ Global Positioning Satellite technology are in development that could be employed on Runway 29 but are not yet in use, Halleran said.

“We need to be proactive. It’s something that needs to be done,” he said.

Taxiways are differentiated from runways by colored lights: Taxiways are usually bordered in blue lights with green lights down the center, while runways are illuminated with white lights.

Taxiway Z at Newark has the green center lights but not the blue lights on its borders, but that is permissible under federal regulations, said Marc La Vorgna, a spokesman for the Port Authority of New York and New Jersey, which operates the airport.

Halleran said the fact that the taxiway does not have the blue bordering lights should not have caused any confusion.

The union president said the air traffic controllers that evening followed all normal procedures for the landing. And Green, the aviation attorney, suggested that the pilots’ mistake was probably beyond the ability of the controllers to catch.

“Clearly it was primarily a pilot issue,” Green said. “A controller would only have been able to tell for the last several seconds” if the plane was landing on the taxiway instead of the runway.

© 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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