Low-cost airlines in China? - Orient Aviation
Low-cost airlines in China? - Orient Aviation
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