NASA Sits on Air Safety Survey

A Continental Airlines worker rides down a baggage conveyor belt plane as a fuel truck pulls up at Houston's Bush Intercontinental Airport in this Oct. 16, 2007, file photo. Anxious to avoid upsetting air travelers, NASA is withholding results from an unprecedented national survey of pilots that found safety problems like near collisions and runway interference occur far more frequently than the government previously recognized. (AP Photo/Pat Sullivan, File) (Pat Sullivan - AP)

Officials involved in the survey touted the unusually high response rate among pilots, 80 percent, and said they believe it is more reliable than reporting systems that rely on pilots to report incidents voluntarily.

"The data is strong," said Robert Dodd, an aviation safety expert hired by NASA to manage the survey. "Our process was very meticulously designed and very thorough. It was very scientific."

Pilot interviews lasted about 30 minutes, with standardized questions about how frequently they encountered equipment problems, smoke or fire, engine failure, passenger disturbances, severe turbulence, collisions with birds or inadequate tower communication, according to documents obtained by the AP.

Pilots also were asked about last-minute changes in landing instructions, flying too close to other planes, near collisions with ground vehicles or buildings, overweight takeoffs or occasions when pilots left the cockpit.

"I don't believe it's in NASA's purpose and mission statement to protect the underlying financial fortunes of the airlines," David Stempler, president of the Potomac, Md.-based Air Travelers Association, said Monday. "They're to provide safety information, and the consequences will fall where they may. We still believe this is an extremely safe air travel system, but it could be made even safer."

NASA's survey, known officially as the National Aviation Operations Monitoring Service, started after a White House commission in 1997 proposed reducing fatal air crashes by 80 percent as of this year. Crashes have dropped 65 percent, with a rate of about 1 fatality in about 4.5 million departures.

NASA had begun to interview general aviation pilots and initially planned to interview flight attendants, air traffic controllers and mechanics before the survey was halted.

In earlier interviews that helped researchers design the NASA survey, pilots said airlines were unaware how frequently safety incidents occurred that could lead to serious problems or even crashes, said Jon Krosnick, a survey expert at Stanford University who helped NASA create the questionnaire. Krosnick also led a Stanford team that paid for a joint AP-Stanford poll on the environment.

"There are little things going on everyday that rarely lead to an accident but they increase the chances of an accident," said Krosnick. "It's the little things beneath the surface that cause the very infrequent crashes. You have to tackle those."

NASA had directed its contractor Battelle Memorial Institute, along with subcontractors, on Thursday to return any project information and then purge it from their computers before Oct. 30.