Leeham News and Analysis
There's more to real news than a news release.
Leeham News and Analysis
- How Trump tariffs affected, and could affect, Airbus, Boeing and Embraer December 6, 2024
- Start-up hybrid plane OEM MAEVE teams with MHIRJ for sales, more December 5, 2024
- Production increase delays hurt Airbus costs December 2, 2024
- Books to consider for Christmas November 29, 2024
- Slow, methodical process to restore Boeing’s trust, efficiencies November 28, 2024
Bjorn’s Corner: New aircraft technologies. Part 34. Design for Certification
October 13, 2023, ©. Leeham News: We are discussing the Detailed design phase of an airliner development program. We have discussed program management methods, development techniques, tools for Detailed design, that improved production methods are as important as improved technology, and that the interaction with the suppliers is key.
But another consideration that affects detail design is the influence of the Certification process. Certification has a major influence on the program work in every step of the aircraft program.
Figure 1. The online version of the FAA 14 CFR Part 25 Airliner Airworthiness regulations. Source: US CFR.
Further developments of the A321, Part 3
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By Bjorn Fehrm
October 12, 2023, © Leeham News: We do an article series about what can be the next development for Airbus’ most popular aircraft, the A321neo. We started with the base data last week to understand the present aircraft and its limitations.
Now, we use our Airliner Performance and Cost Model (APCM) to look at possible changes that can increase the capacity and efficiency of the aircraft and what can be achieved at a reasonable cost.
Summary:
- The capacity of the A321neo can be increased within a rather limited project.
- The more challenging part is not to lose range and field performance from the capacity increase.
Bjorn’s Corner: New aircraft technologies. Part 33. Supply chain
By Bjorn Fehrm.
October 6, 2023, ©. Leeham News: We are discussing the Detailed design phase of an airliner development program. We have discussed program management methods, development techniques, tools for Detailed design and that the production methods today are as important as technology for achieving aircraft performance.
Another decisive part is how to involve and manage the suppliers to a project. The supply chain contributes about two-thirds of the value of an aircraft. Methods and tools to control this part of the project are therefore critical for the program.
Figure 1. The development plan for a new airliner. Source: Leeham Co.
Bjorn’s Corner: New aircraft technologies. Part 32. Design for production
By Bjorn Fehrm
September 29, 2023, ©. Leeham News: We are discussing the Detailed design phase of an airliner development program. We have talked about program management methods, development techniques, and tools for Detailed design.
But there is one area that is more important than even the aircraft aerodynamic, structural, and systems design for a new Heart-Of-The-Market aircraft: how to produce it in higher volumes and at lower cost than before.
Figure 1. The production of an A350 composite airliner. Source: Airbus.
Further developments of Airbus’ A321
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By Bjorn Fehrm
September 28, 2023, © Leeham News: We recently looked at the latest developments around Airbus’ A321XLR certification. When the certification is completed, it extends the A321 to a true Trans-Atlantic airliner.
After the A321XLR, what will be Airbus’ next development? A clean sheet replacement for the A320/A321 series won’t be needed until Boeing replaces the 737 MAX family next decade, and we have described why we think an A220-500 will not happen anytime soon.
The A320/A321 is Airbus main source of revenue and margin. It would, therefore, be a logical focus for further development to keep the success going into the next decade. But what can be done? Is the A321neo with the A321LR and XLR the end of the development of the A321? We use our Airliner Performance and Cost Model (APCM) to analyze A321 fundamentals and look at how to increase capacity and efficiency further.
Figure 1. The Airbus A321XLR. Source: Airbus.
Summary:
- From launch 40 years ago, the A320 family has increased capacity by 66%, more than doubled range, and reduced fuel burn per passenger mile by over one-third.
- What can be achieved over the next 20 years and how?
Bjorn’s Corner: New aircraft technologies. Part 31. Detailed design -3
By Bjorn Fehrm
September 22, 2023, ©. Leeham News: Last week, we discussed program management methods for the Detailed design phase of an airliner development program. While the modern Agile work methods suit smaller projects, the sheer size and complexity of an airliner project that involves hundreds of companies require more structured management methods with Agile used for areas where it’s suitable.
We now go a step deeper than program and configuration management and look at development techniques and tools for Detailed design.
Figure 1. The development plan for a new airliner. Source: Leeham Co.
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Bjorn’s Corner: New aircraft technologies. Part 30. Detailed design -2
By Bjorn Fehrm
September 15, 2023, ©. Leeham News: Last week, we described the beginning of the Detailed design phase of an airliner development program. We discussed the importance of a good information set from Preliminary design, ideally as a collection of digital models forming a Preliminary level digital twin.
We now discuss how the work is managed in the Detailed design phase and how to speed up the work and make it more efficient.
Figure 1. The development plan for a new airliner. Source: Leeham Co.
Bjorn’s Corner: New aircraft technologies. Part 29. Detailed design
By Bjorn Fehrm
September 8, 2023, ©. Leeham News: We described the Preliminary design phase of an airliner development program over the last weeks. Now our project is transitioning into Detailed design.
It’s the most challenging part of the project as we now go from perhaps a thousand people involved at the OEM into tens of thousands and even more people at consultancies and suppliers.
Figure 1. A new airliner family development plan. Source: Leeham Co.
The range of the Airbus A321XLR, Part 2
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By Bjorn Fehrm
September 7, 2023, © Leeham News: The advertised range of 4,700nm for the Airbus A321XLR enables true trans-Atlantic single-aisle routes that can originate further inland, both in the US and Europe. When EASA and FAA demanded that Airbus add extra fire protection around the tank that gives the extended range, rumors told of a substantial range loss.
Last week we could see that whatever the weight increase, the range loss is not substantial. Now we look at what Airbus could do to restore the range of the A321XLR.
Figure 1. The Airbus A321XLR. Source: Airbus.
Summary:
- We could see last week that the range shortfall from the rumored weight increases is less than rumored.
- When we look at the fixes for any range shortfall, they seem straightforward and doable.
Bjorn’s Corner: New aircraft technologies. Part 28. Alternative Preliminary design
By Bjorn Fehrm
September 1, 2023, ©. Leeham News: We described the Preliminary design phase of an airliner development program last week. One could say this was the classical way that aircraft projects conduct Preliminary design.
There is a different way that Conceptual and Preliminary design can be run. It’s more along the lines of pre-development of functions, as a reader commented on two articles back.
Figure 1. An alternative new airliner family development plan. Source: Leeham Co.
