Leeham News and Analysis
There's more to real news than a news release.
Leeham News and Analysis
- Bjorn’s Corner: The challenges of airliner development. Part 26. Maintenance planning October 22, 2021
- Single or twin Aisle for cargo rich routes? October 21, 2021
- Pontifications: Embraer’s strategy for the TPNG October 18, 2021
- Air freight demand explosion: a long-term trend? October 18, 2021
- Bjorn’s Corner: The challenges of airliner development. Part 25. Safety monitoring and reporting October 15, 2021
Bjorn’s Corner: The challenges of airliner development. Part 26. Maintenance planning
By Bjorn Fehrm, Henry Tam, and Andrew Telesca.
October 22, 2021, ©. Leeham News: Last week, we looked into Continued Operational Safety and there specifically Safety Monitoring and Reporting. Now we look at the role Instructions for Continued Airworthiness (ICAs) play in preventing the air safety issues we talked about last week.
An important part of the Instructions for Continued Airworthiness, ICA, is how to maintain the aircraft in a continued airworthy state during its operational life. The aircraft is airworthy when it rolls out of the factory but it needs to keep this condition for its 25 years or longer productive life. How this is done is contained in the maintenance documents, but there is more to it than just producing a maintenance manual.
Figure 1. The Aircraft Maintenance Manual (AMM) for the Boeing 747, part of ICA for the 747. Source: Boeing.
Bjorn’s Corner: The challenges of airliner development. Part 25. Safety monitoring and reporting
By Bjorn Fehrm, Henry Tam, and Andrew Telesca
October 15, 2021, ©. Leeham News: Last week, we introduced the activities around Continued Airworthiness that we have to do during development and flight testing of our aircraft.
As described, the majority of accidents for aircraft are attributed to failings in Continued Airworthiness and Operations rather than design. We listed Continued Operational Safety, Operational Preparedness, and Service Readiness as the three important areas for Continued Airworthiness.
We dive into Continued Operational Safety first, specifically Safety Monitoring and Reporting.
Figure 1. A graph showing how an OEM and FAA surveys the operation of an aircraft and takes action. Source: Boeing.
Bjorn’s Corner: The challenges of airliner development. Part 24. Parallel Activities
By Bjorn Fehrm, Henry Tam, and Andrew Telesca
October 8, 2021, ©. Leeham News: Last week, we described how we conduct the Certification Flight Test together with the Regulator.
Before we describe our path to completion of our flight test program, we need to pause for a minute and discuss some of the other parallel activities that need to come together prior to issues of Type Certificate and roll out of production aircraft.
In article 3 you’ll recall we reviewed the breadth of regulatory involvement in aircraft development. While the work on the design and initial airworthiness (on the left in the chart below) is critical, it’s not the only set of rules we need to be working with if we want to achieve a successful Entry Into Service (EIS) of the aircraft.
In Part 21 of our series we already discussed the preparation of the production system. In the next few articles, we’ll be discussing three additional areas of work that we’re engaged in that must all come together at the program’s completion:
Figure 1. The Wymann Shell FAR Chart explains how 14 CFR Parts relate to each other. Source: FAA. Click to read easier.
Bjorn’s Corner: The challenges of airliner development. Part 23. Certification Flight tests
By Bjorn Fehrm, Henry Tam, and Andrew Telesca.
October 1, 2021, ©. Leeham News: Last week, we described how we produced our Flight Test Articles, FTAs, and how the company flight tests are made.
Now we have finished the Company flight tests and made any modifications required to the FTAs so we can apply for Certification Flight tests with the regulator.
Figure 1. VMU flight test with the Airbus A350. Source: Airbus video.
Bjorn’s Corner: The challenges of airliner development. Part 22. Flight tests
By Bjorn Fehrm, Henry Tam, and Andrew Telesca.
September 24, 2021, ©. Leeham News: Last week, we looked at the necessary Production Certificate for the production of our airplanes.
Now our program plan has approached the mid-phase of the Post-Launch phase. We start assembling our test aircraft to get to flight tests.
Figure 1. The program plan for our project. Source: Leeham Co. Click to see better.
Bjorn’s Corner: The challenges of airliner development. Part 20. Production site and facilities
By Bjorn Fehrm, Henry Tam, and Andrew Telesca
September 10, 2021, ©. Leeham News: Last week, we looked at the Rig design and manufacture for ground and flight testing.
We are now at the stage in our program (Figure 1) where we shall have scouted and deliberated over our Final Assembly production site (Violet bars). We now need to decide on the site and what facilities we need to build and/or hire.
Figure 1. The program plan for our project. Source: Leeham Co.
Bjorn’s Corner: The challenges of airliner development. Part 19. Test rigs for ground and air use
By Bjorn Fehrm, Henry Tam, and Andrew Telesca
September 3, 2021, ©. Leeham News: Last week, we looked at the Certification Compliance Planning we do concurrently with Detailed Design, Figure 1.
It’s now time for us to work on our Test rigs and systems for ground and flight testing. We need to get these defined before we freeze the aircraft’s configuration and start making our flight test aircraft.
Figure 1. The program plan for our project. Source: Leeham Co.
Bjorn’s Corner: The challenges of airliner development. Part 18. Certification work after program launch.
By Bjorn Fehrm, Henry Tam, and Andrew Telesca.
August 27, 2021, ©. Leeham News: Last week, we started looking at our work during the Detailed Design phase after Product Launch. We outlined the exacting work needed to design all parts of the aircraft and how we must keep everything in sync.
An essential part of keeping everything in sync is the Certification Compliance Planning we do in this phase, Figure 1.
Figure 1. The program plan for our project. Source: Leeham Co.
Bjorn’s Corner: The challenges of airliner development. Part 17. Detailed design
By Bjorn Fehrm, Henry Tam, and Andrew Telesca.
August 20, 2021, ©. Leeham News: Last week, we went through our second Design Refinement and how our Processes and Tools must be mature because the next step in the Post Launch phase is Detailed Design.
If the previous phases were about research and inspirational design work, where we measured, collated, and documented the overall design data for the aircraft, Detail Design is about a massive amount of work packages and execution.
Figure 1. The Design of wing structure in CATIA 5. Source: Youtube channel: Magic of Design Software.
Bjorn’s Corner: The challenges of airliner development. Part 16. Post Launch.
By Bjorn Fehrm, Henry Tam, and Andrew Telesca.
August 13, 2021, ©. Leeham News: Last week, we went through the Certification Application, one of the most important milestones in the Pre-Launch phase.
Now we assume we got a Product Launch approval from our board/Investors. We start looking at the work packages that meet us in the Post Launch phase.
Figure 1. The Program Plan for our Green 19 seater. Source: Leeham Co. Click to see in full scale.