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Low-cost airlines in China? - Orient Aviation

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safety<br />

Representatives of Asian <strong>airl<strong>in</strong>es</strong><br />

are to attend a key workshop<br />

be<strong>in</strong>g hosted by the Association<br />

of Asia Pacific Airl<strong>in</strong>es<br />

(AAPA) <strong>in</strong> S<strong>in</strong>gapore on February<br />

20 to hear brief<strong>in</strong>gs from U.S.<br />

Federal <strong>Aviation</strong> Adm<strong>in</strong>istration (FAA)<br />

and Boe<strong>in</strong>g and Airbus specialists on<br />

requirements for the upgrad<strong>in</strong>g of aircraft<br />

fuel tanks designed to elim<strong>in</strong>ate<br />

the potential for fuel tank explosions on<br />

commercial aircraft.<br />

A new rule which could require<br />

significant design changes to fuel tanks<br />

– called Special Federal <strong>Aviation</strong> Regulation<br />

(SFAR) 88 – will need airplane<br />

manufacturers to submit their safety<br />

assessments of the fuel tanks to the FAA<br />

by June 6, 2003. All <strong>airl<strong>in</strong>es</strong> have to comply<br />

with any design changes, <strong>in</strong>spection<br />

or ma<strong>in</strong>tenance requirements result<strong>in</strong>g<br />

from those assessments by December<br />

6, 2004.<br />

“The SFAR covers fuel tank system<br />

design review, flammability reduction,<br />

ma<strong>in</strong>tenance and <strong>in</strong>spection requirements,”<br />

said Leroy Keith, technical director<br />

of the Association of Asia Pacific<br />

Airl<strong>in</strong>es (AAPA).<br />

“It applies to all current and future<br />

passenger aircraft [and] has the potential<br />

to impose a major economic and operational<br />

burden on <strong>airl<strong>in</strong>es</strong> because of the<br />

redesign, <strong>in</strong>spection and ma<strong>in</strong>tenance<br />

required to elim<strong>in</strong>ate all potential ignition<br />

sources.”<br />

The new rule on fuel tanks was developed<br />

follow<strong>in</strong>g several explosions on<br />

commercial aircraft <strong>in</strong> the past 12 years<br />

<strong>in</strong> which the probable ignition source<br />

was <strong>in</strong>side the fuel tank. The most notable<br />

accident was on July 17, 1996, when<br />

Trans World Airl<strong>in</strong>es (TWA) Flight 800,<br />

a B747, exploded shortly after take-off,<br />

result<strong>in</strong>g <strong>in</strong> the death of all 230 persons<br />

aboard.<br />

The accident <strong>in</strong>vestigation results of<br />

that flight led the US National Transportation<br />

Safety Board (NTSB) to recommend<br />

changes <strong>in</strong> fuel tank design.<br />

The FAA has issued numerous Airworth<strong>in</strong>ess<br />

Directives relat<strong>in</strong>g to fuel<br />

tanks <strong>in</strong> the last seven years, <strong>in</strong> addition<br />

to comprehensive regulations to elim<strong>in</strong>ate<br />

potential ignition sources <strong>in</strong> fuel<br />

tanks. Research also has been conducted<br />

<strong>in</strong>to methods that could elim<strong>in</strong>ate, or<br />

significantly reduce, fuel tank flammable<br />

vapours.<br />

It released a Notice of Proposed Rule<br />

Mak<strong>in</strong>g (NPRM) on October 29, 1999 and<br />

a f<strong>in</strong>al rul<strong>in</strong>g, SFAR 88, on May 7, 2001,<br />

which significantly changed its fuel tank<br />

design philosophy.<br />

The design requirement prior to<br />

SFAR 88, with which all exist<strong>in</strong>g aircraft<br />

comply, specified the chance of a fuel<br />

tank explosion was less than one <strong>in</strong> a<br />

billion flights. The new rule assumes fuel<br />

tanks will explode if an ignition source is<br />

Asia’s <strong>airl<strong>in</strong>es</strong> to<br />

discuss new FAA<br />

fuel tank rul<strong>in</strong>g<br />

present. It requires the elim<strong>in</strong>ation of all<br />

ignition sources, from current as well as<br />

future aircraft.<br />

However, Keith expla<strong>in</strong>ed breakthroughs<br />

<strong>in</strong> FAA research programmes<br />

<strong>in</strong> the last six to n<strong>in</strong>e months have yielded<br />

major ga<strong>in</strong>s <strong>in</strong> airborne fuel <strong>in</strong>ert<strong>in</strong>g<br />

technology, <strong>in</strong>clud<strong>in</strong>g an <strong>in</strong>expensive<br />

and lightweight onboard “<strong>in</strong>ert<strong>in</strong>g”’<br />

system. It works by pump<strong>in</strong>g nitrogenenriched<br />

air <strong>in</strong>to fuel tanks, reduc<strong>in</strong>g<br />

oxygen <strong>in</strong> fuel vapours and reduc<strong>in</strong>g<br />

Association of Asia Pacific Airl<strong>in</strong>es technical<br />

director, Leroy Keith: break-through <strong>in</strong><br />

technology<br />

flammability. The new system would<br />

remove ambient air from the aircraft’s<br />

eng<strong>in</strong>es, us<strong>in</strong>g 90cm (three feet) long<br />

air separation modules to extract oxygen<br />

and discharge nitrogen that is then<br />

pumped <strong>in</strong>to the fuel tank.<br />

“The result<strong>in</strong>g vapours have an<br />

oxygen concentration of about 12%<br />

– <strong>in</strong>stead of 21% <strong>in</strong> ambient air – and<br />

are significantly less combustible. The<br />

system must be tested <strong>in</strong> flight, but could<br />

be <strong>in</strong>stalled on some types of aircraft<br />

<strong>in</strong> 2004. Boe<strong>in</strong>g has already applied for<br />

permission to <strong>in</strong>stall such a system on its<br />

aircraft,” said Keith.<br />

“Due to the advance of <strong>in</strong>ert<strong>in</strong>g<br />

technology, the FAA issued a ‘spot<br />

amendment’ to the orig<strong>in</strong>al SFAR on<br />

September 10, [2002], which will allow<br />

equivalent procedures to comply with<br />

the SFAR requirements. In the spot<br />

amendment, the FAA made a major shift<br />

<strong>in</strong> its approach. It will allow <strong>in</strong>ert<strong>in</strong>g to<br />

elim<strong>in</strong>ate the risk of fuel tank explosions<br />

rather than the <strong>in</strong>spections/modifications<br />

required orig<strong>in</strong>ally. This has the<br />

potential to reduce the impact on <strong>airl<strong>in</strong>es</strong><br />

significantly.”<br />

Aircraft manufacturers will have to<br />

show exist<strong>in</strong>g fuel tanks do not have an<br />

explosive fuel/air ratio, and/or no ignition<br />

source present. It appears w<strong>in</strong>g<br />

tanks do not have explosive mixtures<br />

due to lower temperatures and oxygen<br />

content, so only fuselage tanks will<br />

have to be considered, but manufacturers<br />

are still substantiat<strong>in</strong>g this.<br />

Manufacturers have made it clear<br />

they have expended a lot of resources<br />

dur<strong>in</strong>g the last two years on design review,<br />

and <strong>in</strong>spection and ma<strong>in</strong>tenance<br />

programme development to meet the<br />

orig<strong>in</strong>al SFAR, which mandated ignition<br />

suppression and they have recently<br />

been <strong>in</strong>vest<strong>in</strong>g heavily <strong>in</strong> the <strong>in</strong>ert<strong>in</strong>g<br />

approach.<br />

“They would not cont<strong>in</strong>ue to do both,<br />

nor would they support both ignition<br />

suppression and <strong>in</strong>ert<strong>in</strong>g as the solution,<br />

because of the <strong>cost</strong>s <strong>in</strong>volved to them<br />

and the <strong>airl<strong>in</strong>es</strong>,” said Keith.<br />

The orig<strong>in</strong>al SFAR 88 had required<br />

the airplane maunfacturers to submit<br />

the safety assessments of the fuel tanks<br />

by December 6, 2002, with the compliance<br />

date of the design changes by June<br />

6, 2004, but the recent developments<br />

prompted an extension to June 6, 2003,<br />

for the safety assessments submission<br />

and December 6, 2004, for the design<br />

changes.<br />

The workshop will follow a two-day<br />

FAA workshop for regional aviation authorities.<br />

Keith said the rule could have a<br />

“serious impact” on the AAPA’s 17 member<br />

<strong>airl<strong>in</strong>es</strong>, which operate about 1,200<br />

aircraft, 70% Boe<strong>in</strong>g and 30% Airbus.<br />

“Consequently, the AAPA Secretariat<br />

has been actively <strong>in</strong>volved <strong>in</strong> the SFAR<br />

88 developments, ensur<strong>in</strong>g first hand<br />

updates for members and present<strong>in</strong>g<br />

consolidated member positions at the<br />

appropriate forums,” said Keith.<br />

February 2003, <strong>Orient</strong> <strong>Aviation</strong> 45

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