Home' Asian Aviation : AAV_February 2013 Contents 32 AsianAviation | FEBRUARY 2013
having been postponed in mid-2012 (along with
the prospective year-end 777X launch): "The timing
of a decision to launch the programme will depend
on market response during the next phase of our
The 787-10X, which could replace older
commercial aircraft such as the Airbus A330-300
and the four-engine A340-300 and A340-600,
represents an 18ft stretch (to 224ft) of the 787-9
to accommodate an extra 43 passengers. The 320-
seat variant is expected to offer a 6,700-6,750nm-
range with a maximum take-off weight almost 7,000
lb above that of the 787-9.
Since Boeing sees the 787-10X and 777X as
a way to "bracket" the upcoming Airbus A350,
their respective launches cannot be regarded as
discretely. If Boeing launches the 787-10X in, say,
the middle of this year, target entry-into-service is
widely expected to come before 2020, but Boeing
must first decide on the technological characteristics
of the 777X.
ROLLS-ROYCE TRENT 1000-TEN
While the initial 787-8 has a 502,000lb maximum take-
off weight and a 7,630nm range, R-R's Trent 1000-
TEN development -- earmarked initially for the 787-
10X -- is sized for a 553,000lb machine to carry a 33
percent higher load of 323 passengers over a shorter
range when it enters service in 2016. The engine will
be certificated at 76,000lb thrust with the capacity
to provide 78,000lb, allowing mixed-fleet operators
and lessors to use the Trent 1000-TEN exclusively,
matching thrust ratings to each type as required.
Benefitting from Trent XWB development, the
-TEN incorporates advances in the HPC and HPT,
blisk ('bladed disk') technology and "sophisticated"
internal aerodynamics controls, says R-R. Trent
XWB features will include a version of the A350's
"rising-line" intermediate-pressure compressor and
blisks in the first three stages of the HPC. The Trent
1000-TEN is expected to offer up to 3 percent
better SFC than the current standard 70,000lb-
thrust Trent 1000 Package B engines.
Late in 2012, Rolls-Royce flew the 74,000lb-
thrust demonstrator engine for the Boeing
787-9, a higher-thrust version of its Trent 1000
incorporating Package C improvements, on a
Boeing 747-200 flying testbed. The company also
has completed 150-hour endurance trials and
over-temperature tests exceeding normal limits.
Certification is slated for mid-2013, ahead of an
initial flight on the 787-8.
AIRBUS A350 XWB
As of the turn of the year, Airbus remained committed
to the A350-800, which is now scheduled to enter
service in mid-2016, following a two-year delay that
led Qatar Airways in late 2012 to rationalise its
launch orders for the -800, -900, and -1000: three
A350-800s will be delivered as -900s and the other
17 as -1000s. The carrier should receive the first
A350 (a -900) in late 2014 or early 2015.
The R-R Trent XWB will power all A350s -- the
-800 and -900 variants in the 270- and 310-seat
markets, the A350-900F freighter and planned
longer-range A350-900R -- providing a single
engine for the family. The A350-900 offers a range
about 400nm less than the 8,500nm-range A350-
The programme delay has led many industry
pundits to speculate that Airbus might drop the
A350-800 all together. An analytical blog closely
associated with US aerospace consultancy
AirInsight suggests that "just about everyone but
Airbus" foresees the -800's demise, leading it to
expect that the A330 will be re-engined.
While encouraging customers to move up to the
A350-900 would ease pressure on Airbus and the
overall programme, dropping the A350-800 would
provide an opportunity for the Trent 1000-TEN or
GEnX to reinvigorate the A330 -- for which Air Asia
is a potential launch customer.
ROLLS-ROYCE TRENT XWB
With a 118-inch diameter, the Trent XWB fan
will be the biggest such unit R-R has introduced
when it flies in the first half of this year on the
baseline Airbus A350-900. Since late 2012, R-R
has been analysing information garnered from
November's Trent XWB "blade-off" test, a "major
milestone" towards engine certification. "The test
was flawlessly executed, although it will take some
weeks to analyse all data," says the manufacturer.
The Trent XWB family, which incorporates a
two-stage intermediate-pressure turbine "for
efficiency and growth" and "advanced" tip-
clearance control, offers 75,000-97,000lb thrust,
the highest power being provided by a revised
variant being developed for the stretched A350-
1000. This use a larger core unveiled in 2011
as part of the A350-1000 redesign to boost
R-R expects to demonstrate the 97,000lb-
thrust Trent XWB-97 early in 2013, ahead of a
formal first engine run in mid-2014, with the first
flight scheduled in 2016 on an A380 testbed or
an A350. The company says the Trent XWB-97's
turbines have increased capability arising from use
of upgraded materials, and "advanced" coatings
and cooling technology. An improved combustor
retains a 20 percent NOx margin to CAEP 6 limits,
while predicted noise levels are put at QC1 for
arrivals and QC2 on departure.
P&W says it sees no restriction to developing larger, more-powerful GTF engine
variants "right up to 100,000lb thrust"
Rolls-Royce has chosen a 132.5-inch fan for
its RB3025 candidate to power the 777X.
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