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jondc9
13th Dec 2006, 22:11
Giant jet sets off fuel tank concerns
Updated 12/13/2006 2:51 PM ET
By Alan Levin, USA TODAY
WASHINGTON — Federal accident investigators and safety advocates say they are worried that the Airbus A380 double-decker jet will be exempt from new U.S. rules designed to prevent fuel tank explosions like the one that downed TWA Flight 800 in 1996.

European officials have said that they do not agree with fuel tank safety rules proposed in the United States and will not make the mammoth new plane subject to them.

U.S. and European regulators on Tuesday gave Airbus approval to fly passengers on the largest jetliner in history, but left unresolved the fuel tank issues. The U.S. Federal Aviation Administration says it intends to release a final fuel tank rule next year.

As proposed, the rule would only apply to U.S.-registered aircraft. If Europeans do not adopt the rule, foreign carriers would be free to fly A380s into this country without updating the jet's fuel tanks.

The National Transportation Safety Board declined comment Tuesday, but the agency took the unusual step of writing to European regulators in 2004 to urge fuel tank safety measures on the A380. The NTSB said that without the measures, the jumbo jet could be vulnerable to an explosion.

NTSB CONCERNS: 2004 letter to European regulators (.pdf)

Safety advocates say it's a mistake to exempt the jet from the rules.

"There is no explanation other than it's a stiff arm in the face of safety," says Jim Hall, an aviation lawyer who chaired the NTSB during the TWA investigation.

"It's unfortunate that an aircraft of this size and significance does not have a requirement to eliminate the flammability in the tanks," says Carol Carmody, a former NTSB board member.

Airbus argues that its planes don't need additional fuel tank safety measures because none of its tanks have ever exploded, and it says the fuel tanks on the A380 are not flammable enough to be subject to the proposed rules.

Spokesman Clay McConnell says the jet does not have a tank in the fuselage, which is what blew up on TWA 800.

"This airplane has undergone more testing and more stringent evaluation than any other commercial airplane in history, and today is a very proud day that it has been certified as ready to fly," McConnell said.

The FAA concluded that Airbus jets remain vulnerable.

Since shortly after TWA 800 crashed on July 17, 1996, killing 230 people in the ocean off Long Island, the NTSB called for installation of devices that remove oxygen from fuel tanks to prevent explosions.

After years of balking, the FAA agreed in 2004. The agency said it would require the devices on tanks that were flammable.

The proposal has met intense opposition from airlines, Airbus and European officials. Boeing, meanwhile, agreed to voluntarily install the devices.

The 4-engine A380 will hold about 550 passengers. It has been plagued with cost overruns and delays. The European Aviation Safety Agency, notified the FAA earlier this year that only models certified after the A380 should be subject to the fuel tank improvements.

MarkD
18th Dec 2006, 19:40
US originated FUD aside, surely Airbus could retrofit the fuel tank mods seeing as they seem to be retrofitting quite a few other things and there aren't many frames off the line yet...

PAXboy
18th Dec 2006, 21:03
Whilst appreciating the responsibilities of those that provide public transportation ... it would be interesting to see how many people die each year because their domestic car catches fire and the fuel tank explodes. AFAIK, commercial aviation is still safer than using the car to get to the airport. This requirement (to neutralise oxygen in empty tanks) is an old style political @$$ covering exercise. It is a pity that Boeing felt they had to comply.

fmgc
18th Dec 2006, 21:35
The FAA are really really worried about this, you can tell because it only took them 8 years to come up with the ruling!!

Partisan? NEVER!!!

h73kr
18th Dec 2006, 21:42
Nitrogen inerting as proposed by the FAA has not been proven to the satisfaction of the European authorities. US built a/c with US type certificate gets modifications mandated by the US to stay flying, simple as. European a/c with European type certificate gets what Europe mandates for it. If Europe doesn't see the mandating of nitrogen inerting as necessary or effective, and the manufacturer doesn't either, it won't get it. However, then, your US aircraft wants to fly to Europe, your European a/c wants to fly to the US, and it all gets political.....in my opinion!

Clandestino
19th Dec 2006, 06:04
Aviation safety network (http://aviation-safety.net/database/dblist.php?Event=FIT) lists 23 cases of airplane hull loss caused by fuel tank vapours explosions, spread over 55 years. Statistically, not a lot but any improvement towards greater safety should be welcome, so let's have a look at individual cases to see if inerting would help. Some causes of ignitions are: "lightning strike", "chafing of boost pump wires ", "A fuel pump ran dry and ignited fuel vapours after becoming overheated", "short circuit outside of the center wing fuel tank that allowed excessive voltage to enter it through electrical wiring associated with the fuel quantity indication system", "running the fuel pump in the presence of metal shavings", "damaged wiring" and "a bomb detonated on board, igniting fuel vapours in an empty fuel tank". Much better and cheaper than inerting would be providing aircraft with discharge paths that can cope with ligthning strikes and fuel pumps that automatically switch off when overheated. Surprise, surprise - modern airplanes have been so equipped for at least last 30yrs. Granted, inerting would have prevented at least some of the occurences, but do you really think that airline maintenance that allows chaffed wires and metal shavings inside the fuel tank to passs undetected would bother with keeping inerting sys operative? I don't.

It would be much better to better enforce adherence to current design and maintenance regulations than bringing new requirements that are difficult to comply with and won't do much good anyway. Methinks that, in the words of Skunk Anansie, "Yes, it's f***ing political".

panda-k-bear
19th Dec 2006, 11:00
To try to drag this back on topic - actually I agree with theprinciple of excluding the A380 - and some other Douglas and Airbus designs - from this rule. The Boeing design philosophy allows the exchange of heat into the center fuel tanks, which may cause fuel to vaporise if those tanks aren't full. This is ude to a bit of a flaw in the design that can rear its ugly head if the aircraft has been sitting on the ground in high temperatures with the air conditioning selected 'on'. Wouldn't it be more prudent to order a change in design to remove this flaw rather than penalise those aircraft that don't face the same issue? Or is that too logical?