par Beochien Mar 10 Juil 2012 - 22:07
Un énorme post de : Aspire Aviation !
Long, mais remarquablement bien fait !
A lire pour tous !
Inclus d'intéressantes infos sur les A332-A333 et A350 !
Un shéma intéressant au passage !
J'en édite la moitié !
Bon courage ... , je disparais qq jours , com's chaotiques à prévoir !
---------- Allez, va pour le lien et des extraits, de Daniel Tsang --------------
http://www.aspireaviation.com/2012/07/10/airbus-is-right-on-a330-improvement-strategy/?lang=en
Having decided against re-engining the twin-aisle medium to long-haul
A330 aircraft which is likely to undermine the business case of its
A350-800 sibling (“Airbus mulls re-engined A330 along with sharklets“,
5th Mar, 12), Airbus is adopting the least risky option of offering
new, higher gross weight variants of the A330 aircraft family that not
only will see the A330 being more capable than it has ever been, but
also provide a natural hedge against further A350 delays as the
carbon-composite aircraft ramps up in its development ahead of first
flight in 2013 and service entry in mid-2014.
Airbus will offer a 240-tonne (529,109lbs) maximum take-off weight
(MTOW) variant of the 300-seat A330-300 by mid-2015 first, from today’s
235 tonnes (518,086lbs), followed by the smaller A330-200 and A330-200F
freighter thereafter.
The 240-tonne 300-seat A330-300 will see its range being extended by
up to 400nm (nautical miles) to 5,950nm (11,020km) with 5 tonnes more
payload, whereas the 240-tonne A330-200 will have its range being
extended by 270nm to 7,050nm (13,060km) with 246 passengers and 2.5
tonnes more payload than the 238 tonnes variant.
Airbus said the latest incremental improvements being rolled out on
the A330 aircraft will see a 2% reduction in its block fuel burn, with
aerodynamic improvements contributing 1% of the fuel burn reduction,
while engine improvements contribute to the remainder.
Airbus chief operating officer (COO) customers John Leahy said the
improved 240-tonne A330-300 will be able to cover 94% of the 777-200ER
missions, versus the first 212-tonne A330-300 production examples which
only covered 65% of the Boeing 777-200ER markets with a range of
3,900nm.
“The A330 has come a long way in the last 10 years, and we are
delighted to bring to more airlines the advantages and reliability of
A330 economics over ever wider markets. This aircraft is the most
popular aircraft ever in its category and looks set to hold this
position for years to come,” Leahy said
-------------
Meanwhile, the minimal change required for the higher maximum
take-off weight (MTOW) A330s means it will free up scarce engineering
resources for the A350 XWB (Extra Wide Body) programme, which has had a
6-9 month delivery slip that sees its entry into service (EIS) being
postponed to mid-2014, in addition to being a natural hedge for airlines
against further A350 delays.
Airbus said it has decided against adding the A320 sharklets to the
A330 and that the increase in maximum take-off weight (MTOW) is achieved
through adding the load alleviation function to its fly-by-wire system.
In doing so, the manufacturer’s empty weight (MEW) of the aircraft
will not increase much since the need of strengthening of outer and
centre wing boxes is eliminated.
As a software update of an A330′s fly-by-wire system could be achieved fairly easily, Aspire Aviation
thinks Airbus should make a retrofit programme available earlier than
the mid-2015 timeframe and enable airlines to enjoy a 1% reduction in
fuel burn from improved engines, as another 1% fuel burn saving comes
from shorter flap fairings.
This is consistent with Airbus’ approach in continuously improving
the A330 aircraft, with a retrofit programme for the 238 tonnes
A330-200 being available and another retrofit programme for 235-tonne
A330-300 due to be available from third quarter of this year onwards.
China Eastern Airlines, Hawaiian Airlines, Hong Kong Airlines have
already taken up the A330-200 retrofit programme while Korean Air, China
Southern, China Eastern, Turkish Airlines and Aircastle are receiving
238-tonne -200 production aircraft. Swiss International Air Lines, China
Southern, Air China and General Electric Capital Aviation Services
(GECAS), in the meantime, are customers of the 235-tonne A330-300.
Therefore this bodes well for the A350 XWB programme, particularly so
for the smallest 270-seat A350-800 variant whose entry into service
(EIS) is delayed by 2 years from 2014 to 2016.
The A350-800 is the variant with the most serious overweight issue in
the aircraft family with an around 5 tonnes overweight and has already
missed its fuel burn target by “a few per cent”, whereas the baseline
-900 model is around 3 tonnes overweight, according to Aspire Aviation‘s
sources at Airbus. Had Airbus pressed ahead with re-engining the A330
along with sharklets, it would have diluted scarce engineering resources
from the A350 XWB and A320neo (new engine option) programmes that would
otherwise have worked at trimming the weight of the A350 and ensuring
the smooth execution of the crucial aircraft programme.
JPRS