The US government will order airlines to install a system to reduce the chance of fuel tank explosions like the one that downed a TWA Boeing 747 in 1996, Federal Aviation Administration chief Marion Blakey said on Tuesday.
The decision affects about 3,800 Boeing and Airbus aircraft operated by domestic airlines.
In the past 14 years there have been three fuel tank explosions, including the TWA accident, resulting in 346 deaths. Blakey said the new device could eliminate up to four accidents over the next 25 years.
"We have a plan that will virtually eliminate fuel tank explosions aboard aircraft," Blakey said at a news conference.
A cost-benefit analysis still must be done and airlines need time to plan for the change, so the requirement is not expected to take effect for at least two years. Once the rule is issued, the so-called fuel-tank inerting program will be phased in over seven years. During that time existing planes will have to be retrofitted with the device and new planes will have them as standard equipment.
Some jetliners may be fitted with the systems before they're required. Jim Proulx, Boeing spokesman, said the company plans to start producing new planes and retrofitting existing ones late next year.
TWA Flight 800 crashed off the coast of Long Island, New York on July 17, 1996, killing all 230 people aboard. The National Transportation Safety Board blamed the accident on an explosion, saying vapors in a partly empty fuel tank probably were ignited by a spark in the wiring.
The accident prompted FAA scientists to step up research aimed at eliminating potential ignition sources for such explosions and reducing the flammability of vapors in fuel tanks.
They came up with a way to make fuel vapors less likely to ignite. The system pumps air flowing from the aircraft engine into canisters. A ropelike substance in the canisters filters oxygen and water from the air. The resulting nitrogen-rich mixture, which is much less likely to combust than normal air, is pumped into fuel tanks. The filtered oxygen and water is dumped off the aircraft.
Though the new system probably wouldn't be fitted onto all planes that need it until 2013, the FAA has already ordered airlines to make 60 changes to eliminate possible ignition sources, Blakey said.
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