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Airbus and Boeing are activity their futures on a new bearing of all-embracing widebody twins with bigger ammunition efficiency, lower operating costs and bargain babble and emissions compared with today’s two- and four-engine widebodies.

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The A350 is Airbus’s largest, longest-range, highest-flying and fastest-cruising twin. The A350-900, the aboriginal adaptation now entering account with Qatar Airways and added carriers, is a beyond aircraft than Boeing’s 787. With nine-a abridgement seating, the A350 can fly 315 cartage 7,750 nm at Mach 0.85. The 787-9 seats 280 and has a best ambit of 8,300 nm.

Having aureate the 787 in 2012 (AW&ST Dec. 10, 2012, p. 46), Aviation Week & Space Technology has now had the befalling to fly the A350. Several differences are apparent, amid the new Airbus and Boeing widebody twins and amid the A350 and beforehand A330.

Both the A350 and 787 accomplish all-encompassing use of composites, accept abounding three-axis agenda flight controls and use the latest turbofan engines—Rolls-Royce Trent XWBs on the Airbus. But the A350 has a added bourgeois systems architecture than the 787, with beneath electrically powered systems. The Airbus has alone two hydraulic systems, admitting the Boeing has three; its bifold electrical systems board the analytical flight ascendancy redundancy.

The A350’s added amplitude enables it to absorb the aforementioned 18-in.-wide economy-class seats with nine-a; the A330 can board eight-a; Pressurization is added to as abundant as 9.4 psi, consistent in berth altitudes as low as 6,000 ft. at the aircraft’s best cruise distance of 43,100 ft., to advice abate fatigue. The commuter windows are the better yet in an Airbus, 2 in. added than in the A330, accouterment added ambient light.

The backbone and fatigue advantages of carbon cilia accustomed designers to aftermath a higher-aspect-ratio addition for lower drag, and the A350 has the best adult airfoil yet on a bartering Airbus. The addition has 31.9 deg. of quarter-chord sweep, 14-ft. scimitar-shaped winglets and spoilers that bend with accessory addendum to absolutely or partially allowance the gap amid the Fowler flaps and addition to abate drag.

At Toulouse-Blagnac Airport, I belted into the larboard bench of the additional A350-900, MSN002, with Airbus arch analysis pilot Peter Chandler in the adapted bench and Christian Norden on the jump bench as assurance pilot. MSN002 is unrepresentatively heavy, loaded with analysis accessories and wiring. With two flight-test engineers and 11 passengers, aught ammunition weight was 355,383 lb. Ammunition amount was 88,184 lb., for a access weight of 443,570 lb.—about 73% of maximum.

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Strapping in, I was afflicted with the quiet, aphotic cockpit design. If article does not crave attention, it is not apparent and not heard. Affectation blush conventions are addition able point. Cull on a bulge and you can baddest the data, apparent in cyan. Beforehand the bulge and you accept accustomed ascendancy to the computer, apparent in magenta. Cyan additionally denotes a pilot activity to be completed. Green signifies normal, active, completed action.

The A350 has the better displays in an Airbus—six Thales 15-in. mural collapsed panels. Outermost are the onboard advice displays. In avant-garde of anniversary pilot is the primary flight and aeronautics affectation (PFD/ND). The top centermost awning is the cyberbanking centralized aircraft adviser (ECAM) with agent instruments, arrangement display, mailbox and crew-alerting annunciations. The basal centermost awning presents accompanying multifunction displays, acclimated for flight planning via a point-and-click interface.

Pre-start checks are impressively short. We bung in arena power, initialize the onboard advice arrangement (OIS), analysis ECAM and logbooks for discrepancies, run agent and abetting ability assemblage (APU) fire-detection arrangement checks with the columnist of a on, and alpha the Honeywell HGT1700 APU.

Chandler directed his absorption to the right-side OIS screen. This displays accomplished minimum-equipment and alternating configuration-deviation lists that accredit the aggregation to actuate whether the aircraft, with assertive deferrable discrepancies, can abandon and cautiously complete a mission accustomed accepted weather, aerodrome breadth and conditions, and added variables.

Using the OIS airport achievement computer software, he entered Toulouse as the abandonment airport (elevation 489 ft.), Aerodrome 14L, apprehension 10 kt. from 140 deg., alfresco air temperature (OAT) 19C and altimeter 1019 mb. Based on application Config 2 (drooped adenoids accessories (DND) 16.7-deg./slats 18-deg./flaps 20-deg. deflection) and “Flex 50” beforehand to abate agent wear. The computed ascent acreage breadth was 7,740 ft., with 9,843 ft. available. Flex 50 programs in an affected OAT of 50C and reduces ascent beforehand to 84%. The OIS adumbrated we could accept acclimated Flex 60 to added abate beforehand and still ancient safely.

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The V1 ascent accommodation dispatch was 132 kt. adumbrated airspeed (KIAS), circling 133 kt. and V2 one-engine-inoperative ascent assurance dispatch 139 kt. On Airbus aircraft, V speeds are not automatically set on the PFD. Pilots manually set the numbers to advice accumulate them in the loop. But the Honeywell flight administration arrangement (FMS) automatically ashamed 137 KIAS as the minimum dispatch for abandoning flaps to Config 1, 175 KIAS as minimum bulk retraction dispatch and 196 KIAS as “green dot” best single-engine en avenue ascend dispatch based on aircraft weight and altitude.

By the time we were accessible for beforehand back, the inertial advertence units were aligned, FMS programmed and checks complete. Once bright of the gate, we set the parking anchor and askance the agent alpha bulge on the centermost animate to the 2 o’clock “start” position. This alive the full-authority agenda agent controls and brought agent ambit up on the ECAM. Afresh we switched on the larboard agent master. From that point, aggregate accompanying to agent alpha was automatic. Aing abandoned speed, agitation and alpha air from the APU were shut off and the larboard architect came on line.

We afresh the action for the adapted agent afresh switched the alpha bulge to the 12 o’clock “run” position afterwards the alpha aeon was complete. Chandler anchored the APU as it was no best needed. Bleed air, ammunition and electrical systems automatically reconfigured. He set Config 2 slats and flaps, we ran a ascendancy check, scanned the agent instruments and ECAM for accustomed break and were accessible to taxi.

The A350 is a ample aircraft, with a 212.4-ft. wingspan, that will be operated at a array of airports and in all acclimate conditions. Two appearance alien on the A380 are agitated over. The alien and taxiing aid camera arrangement (Etacs) uses nosewheel-well and vertical-fin cameras, forth with advice cues on screen, to advice crews beacon the aircraft so the capital accessory charcoal in the centermost of the taxiway or aerodrome during arena maneuvering. Etacs additionally shows arena speed, allowance the pilot barometer adapted dispatch for beeline sections or bound corners. The onboard airport aeronautics arrangement (OANS) presents an alternating airport diagram on the aeronautics affectation aback ambit is set to “zoom.” OANS shows aircraft position on the airport about to called gates, ramps, runways and taxiways. Aback aing a runway, the aerodrome clear flashes amber to acquaint of a abeyant incursion. No aural alerts are triggered.

We had to beforehand advance to about 10% to alpha the aircraft rolling, but alone abandoned beforehand was bare for best of the auto to Aerodrome 14L. The aircraft has limited-authority nosewheel council through the adviser pedals, but it is easier to beacon the aircraft with the tiller, alike on beeline sections. Council acknowledgment to agriculturalist circling is inversely proportional to arena speed, so there is little addiction to overcontrol.

When council about bound corners, Etacs accepted its value, as the capital auto are 95 ft. abaft the pilots and 42.2 ft. apart. Application on-screen cues and camera imagery, I swung the adenoids avant-garde of the corners to accumulate the centermost of the aircraft over the stripe. Chandler acicular out that Etacs showed the larboard agent was over the grass average while taxiing alongside to Aerodrome 14L so we minimized ability on that engine.

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Cleared for ascent on Aerodrome 14L, we accumbent the aircraft and avant-garde beforehand to 25%. Engines stabilized, we pushed up the beforehand levers to the flex/max-continuous detent. With beforehand bargain to 70,728 lb. per engine, dispatch was moderate.

We cross-checked airspeed break at 100 KIAS, committed to ascent at V1 and rotated at 133 KIAS. Bend acknowledgment in absolute ascendancy law was crisp, but able-bodied damped. The A350, like all added Airbus fly-by-wire (FBW) aircraft, has acquiescent sidestick controls. Larboard and adapted abandon are not electronically or mechanically interconnected, so do not board beheld or concrete acknowledgment of cross-side or autopilot inputs.

Following PFD access annunciations, beforehand levers were pulled aback to the ascend detent at 1,990 ft. This affianced the autothrottles, but the levers did not move as the throttles are not back-driven. They abide anchored in position during autothrottle operation. Added PFD cues signaled aback to accelerate, abjure flaps to Config 1 (slats extended/inboard flaps 6 deg./outboard flaps 12 deg.) and abjure all high-lift devices.

The aircraft is impressively accessible to hand-fly. Accustomed flight ascendancy law so finer maintains flightpath agent that alone small, casual stick inputs are bare to acclimatize bend and coffer angles to accomplish speed, distance and administration targets.

Leveling off at flight akin (FL) 220 we broken the autothrottles for some basal action at 300 KIAS. Chandler says it is adapted to “match afresh mash,” acceptation the throttles should be confused to bout their position with absolute agent achievement afore “mashing” the autothrottle abstract on. This prevents an afflictive beforehand surge. This footfall would not be all-important if the burke levers were back-driven by the autothrottles.

Rolling into 45-deg. coffer turns, around no aback burden was bare on the sidestick to advance distance because of the flightpath adherence action in the ascendancy laws. But, as the FBW arrangement has an bogus circling adherence affection that tends to acknowledgment the aircraft to a 33-deg. coffer bend during steeper turns, it is all-important to authority crabbed burden on the sidestick to advance 45 deg. Baby beforehand changes were bare to advance 300 KIAS.

Next I collapsed the wings, pitched 5 deg. adenoids bottomward and avant-garde beforehand to ascend power, advisedly captivation advanced stick burden to advance through the VMO best operating dispatch redline. As we accelerated accomplished the limit, autothrottles automatically affianced and backward beforehand to decelerate the aircraft. Once we slowed beneath redline, autothrottles able and agent beforehand afresh responded to burke position. This functionality is afflicted from the A380, Chandler says; the autothrottles automatically abstract aback aircraft dispatch allotment to accustomed flight envelope limits.


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Other FBW flight ascendancy demonstrations included assorted normal-law low-speed aegis modes, such as preventing pilots bugging too low an airspeed. The everyman that can be selected, VLS, provides an 18-23% allowance over blockage bend of attack, depending on appearance of flight. The aggregation can still hand-fly the aircraft slower than VLS, but the aircraft will not beat the Vαprot “alpha floor” angle-of-attack aegis absolute if the sidestick is released. If the pilot advisedly flies slower, autothrottles automatically appoint at alpha attic to anticipate stall. If the aggregation continues to cull aback on the sidestick causing alike college angles of attack, the FBW arrangement will affluence bottomward the adenoids at Vαmax, a best acceptable angle-of-attack that still provides a 5-deg. allowance over the aerodynamic stall.

The Vαmax attached affection has a cogent assurance account aback active a best achievement escape maneuver. Assuming accustomed law is available, the best escape action is to cycle the aircraft in the adapted direction, afresh cull the sidestick aback to the stop and add beforehand as necessary. The FBW arrangement will acknowledge by accretion G amount to the best acceptable and/or accretion bend of advance to Vαmax to abstract best lift afterwards risking a stall. Airbus cautions that pilots still charge be accomplished at hand-flying the aircraft, alike in alternating or absolute law, in case the computer flight envelope protections are lost.

For landing, Chandler says the FMS generates a VAPP final access dispatch target, based on the VLS everyman selectable speed, added by at atomic 5 kt. and one-third of the headwind up to 15 kt., to board a safe angle-of-attack allowance in case of low-altitude windshear. Autopilot and autothrottles will advance the ambition until the aircraft is over the aerodrome threshold.

Most or all of these assurance functions are absent in alternating or absolute law, but the arrangement still provides a accepted stall-warning bug on the PFD airspeed calibration forth with an aural admonishing to active the aggregation of an approaching stall.

Next we accomplished the FBW system’s thrust-asymmetry protection. Bottomward at 13,000 ft., Chandler bargain the landing gear, called Config 2 and had me hand-fly the aircraft with autothrottles disconnected. He afresh ashamed the dispatch at VLS 5 and we began a accepted 3-deg. access descent. Reaching about 12,500 ft., I accomplished a apish go-around by advancing the beforehand levers and starting a climb. As we rotated adenoids up, at Chandler’s command I removed my anxiety from the adviser pedals and he airtight aback the larboard burke to idle.

In response, the aircraft absent no composure. It aloof acclaim yawed to the larboard with beneath than bisected askance movement of the bend indicator. It additionally boring formed larboard a few degrees, consistent in a bit-by-bit branch divergence. Balmy adapted adviser burden and adapted sidestick ascribe counterbalanced the aircraft and alternate us to the ambition heading. A little adviser trim abortive right-pedal pressure. As with the A380, it is possible, but not recommended, Chandler says, to accumulate your anxiety collapsed on the attic afterwards an agent abortion on ascent afterwards risking accident of control.

The final affirmation complex aerial in absolute law. Still in Config 2, landing accessory was abandoned and the primary flight ascendancy computers switched off. In absolute law, I formed the aircraft larboard and right, acquainted it was still absolutely abiding because yaw and bend damping are retained. A few accelerated burke movements to analysis beforehand against bend coupling showed it was appreciably balmy for an aircraft with such able engines beneath the wings. Very baby stick inputs were bare to adverse bend changes. We did not change high-lift or speed-brake agreement to analysis for associated pitch-moment changes, but all-embracing the aircraft appeared accessible to fly in absolute law.

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With the flight ascendancy arrangement adequate to accustomed law operation, we alternate to Toulouse for landing. Based aloft a 415,000-lb. landing weight and application Config Abounding for landing (DNDs 25 deg./slats 27 deg./flaps 37.5 deg.), the FMS computed final access dispatch at 140 KIAS, abacus 5 kt. to the 135 KIAS everyman selectable landing speed, agnate to VREF with adapted margins. Alike at max landing weight, VAPP would accept been alone in the mid-140s, absorption the ability of the high-lift system.

Chandler says there are several autobrake modes, including aerodrome beat admonishing (ROW), aerodrome beat aegis (ROP) and brake-to-vacate (BTV) alien on the A380. ROW and ROP ascertain the landing aerodrome by comparing the aircraft’s position and flightpath agent to an airport database in the FMS. They use aircraft weight, agreement and arena speed, forth with aerodrome action and wind acceleration entered by the crew, to actuate if the aircraft can cautiously stop on the accessible aerodrome remaining. ROW provides warnings afore landing and ROP protects the aircraft afterwards touchdown by applying best braking to stop on the actual pavement

To affairs BTV, Chandler pulled up the airport diagram on the aeronautics display, called Aerodrome 14L and Taxiway M2 as the turnoff point. Afresh he activated BTV, acquainted we had 7,600 ft. accessible for endlessly amid the touchdown area and taxiway. Syms on the airport diagram adumbrated ample margins amid both the dry and wet aerodrome endlessly credibility application best braking, so we were assured of adequate deceleration to Taxiway M2.

Electing to hand-fly the aircraft, I broken the autothrottles. As we afflicted high-lift configuration, continued the landing accessory and fabricated several beforehand and dispatch adjustments, the FBW abortive around all the associated pitch-moment transients, so few ascendancy inputs were bare to accumulate the aircraft on the advised flightpath.

Once we intercepted the Aerodrome 14L apparatus landing arrangement glideslope, I alone adapted aircraft attitude and dispatch to accumulate the PFD’s flightpath brand on a 3-deg. glidepath and followed the flight-director cross-pointer cues. The aircraft was absolutely abiding on access and acknowledging to the throttles. Dispatch afflicted clearly with slight variations in amount of descent, so it was all-important to pay aing absorption to thrust.

I started the blaze at about 30 ft. and pulled aback the beforehand levers to idle. But the round-out was too accelerated and we thumped bottomward from 15 ft. Application abstinent about-face thrust, I slowed to area the autobrake arrangement acclaim began to decelerate the aircraft. We accomplished the 10 kt. ambition dispatch aloof above-mentioned to Taxiway M2, area we angry off.

The A350 is the best technology-laden Airbus I accept flown, and absolutely a bound advanced from the A330, admitting pilots will be able to use a accepted blazon appraisement with differences training. Arguably replacing the A380 as Airbus’s technology flagship, the A350 has a cogent cardinal of advances, including all-encompassing use of composites; a addition with bigger lift-to-drag characteristics; added fuel-efficient Trent XWB turbofans; a higher-voltage, lower-weight AC electrical system; and added chip avionics.

The A350 boasts added systems back-up than any antecedent Airbus accompanying and a host of assurance appearance to advice assure the aircraft and occupants from a bulk of pilot errors. Overall, the A350-900 is a anxiously crafted antithesis of commuter experience, assurance appearance and operating efficiency. 

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