Airbus is to migrate A321XLR technology – including its revised wing design – to the standard A321neo, while a separate batch of enhancements for the single-aisle family will be applied first to the A320neo before being transferred up to the larger variants.
The long-range XLR features a lighter wing with a single-slotted inboard flap. That arrangement will now be incorporated into the regular A321neo, which currently uses a double-slotted design. A321neos will also take advantage of a take-off performance improvement system which introduces intermediate flap positions and works in conjunction with the single-slotted flap arrangement.
What STEP4 actually changes
The changes form part of a package of incremental improvements known as STEP4. Beyond the wing and flap work, A321neos will benefit from new flight-control laws, the lighter electronic ‘e-rudder’, forward cabin temperature zones, and updated multi-functional runway lights.
Head of A320-family development Torsten Hartung says the airframer is putting the “good ingredients” from the XLR onto the popular A321neo platform. That platform hardly needs the help commercially: the A321neo had a backlog of over 5,600 orders at the end of June, making it comfortably the centre of gravity of the entire Airbus narrowbody business.
Why the A320neo goes first
The STEP4 enhancement also entails new modifications which Airbus is to apply initially to the A320neo, as a low-risk measure to ensure production maturity before transferring them to the higher-rate A321neo, including the XLR variant.
The A320neo will notably receive a new ‘cobra’ duct for the auxiliary power unit – mounted in the top of the fuselage and aimed at enhancing cabin air quality – along with corrosion-prevention measures such as titanium cabin rails.
“The baseline A320neo is the first model to incorporate and prove the new modifications,” says STEP leader for A320 family programme development Martin Schnoor. “Where we physically change the aircraft we decided to apply it first on A320neo in order to learn and see how well things are going.”
Once integration on the A320neo line is smooth, the new modifications will be made to the A321neo and XLR.
Timing and limits
Schnoor says deliveries of initial STEP4 A320neos are beginning, with the first A321neos and XLRs set to follow after a year. That sequencing matters for an airframer that has spent much of the past two years trying to protect delivery rates while absorbing supply chain pressure – introducing a physical change on the lower-rate line first limits the blast radius if something does not behave as expected.
There is one structural limit to how far the sharing can go. The A320neo has a different wing to the A321neo, so the wing-related XLR improvements cannot simply be handed down. Outside of those wing changes, however, Airbus is ultimately aiming to migrate as many XLR innovations to the A320neo as it can.
The approach is a familiar one for a mature programme. Rather than launching a clean-sheet replacement, Airbus is harvesting the engineering already paid for on a niche long-range derivative and pushing it into the highest-volume products in the range. For operators, the practical result is a gradual improvement in take-off performance and weight on aircraft that will look externally almost identical to the ones already on the ramp.
Sources: FlightGlobal. Featured image: AI-generated by AviationShop. By Elena Vargas.
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