Leeham News and Analysis
There's more to real news than a news release.
Leeham News and Analysis
- Boeing CEO promises company is turning around…again April 24, 2024
- Solid start for stand-alone GE Aerospace despite cuts to LEAP output April 23, 2024
- SPEEA, Boeing at impasse over safety program, union says April 23, 2024
- Better transparency needed on Boeing’s 1Q earnings call April 22, 2024
- Bjorn’s Corner: New engine development. Part 4. Propulsive efficiency April 19, 2024
Bjorn’s Corner: Fly by steel or electrical wire?
By Bjorn Fehrm
July 25, 2019, ©. Leeham News: Last week’s Corner which dealt with Airbus’ issue with an updated A321neo Fly By Wire (FBW) and how it was unrelated to the issue of the Boeing 737 MAX, gives a good segue to a Corner series about the possibilities of FBW versus classical flight controls when it comes to tuning an airliner’s flight characteristics.
The two different control principles present the designer with very different challenges and possibilities.
The Fly-By-Wire Airbus A321XLR. Source: Airbus.
Bjorn’s Corner: Airbus’ A321neo has a pitch-up issue (now with a second update)
By Bjorn Fehrm
July 19, 2019, ©. Leeham News: The European Aviation Safety Agency EASA has issued an Air Worthiness Directive (AD) to instruct operators of the Airbus A321neo of a Pitch instability issue.
EASA writes “excessive pitch attitude can occur in certain conditions and during specific manoeuvres. This condition, if not corrected, could result in reduced control of the aeroplane.”
We analyze how this is similar or different to the Boeing 737 MAX pitch instability issues.
NOTE 2: We have got a further update from Airbus, see below.
Bjorn’s Corner: Kjos departure signals changes at Norwegian
By Bjorn Fehrm
July 12, 2019, ©. Leeham News: Norwegian Air Shuttles’ (Norwegian) founder and CEO for 17 years, Bjorn Kjos stepped down yesterday. Over the last year the CFO, Board chairman and now the CEO have changed.
This signals a change in strategy for Norwegian. The new management is focused on halting growth and cutting costs. Norwegian must now consolidate itself to profitability.
Figure 1. Norwegians Intercontinental network spring 2019. Source: Norwegian.
Bjorn’s Corner: Cutting corners in aerospace costs a fortune
By Bjorn Fehrm
July 05, 2019, ©. Leeham News: It seems more and more likely the 737 MAX grounding will go well beyond six months and it can approach nine months to a year depending on developments in the next months.
The costs to Boeing for the MAX debacle are now approaching the costs of a new aircraft development.
Bjorn’s Corner: New pitch trim issue forces further changes to 737 MAX software
By Bjorn Fehrm
June 28, 2019, ©. Leeham News: “The Federal Aviation Administration has asked The Boeing Company to address, through the software changes to the 737 MAX that the company has been developing for the past eight months, a specific condition of flight, which the planned software changes do not presently address.”
This is the text of an 8-K filing Boeing issued to the stock market two days ago. Here is what it means.
Bjorn’s Corner: Why hybrid cars work and hybrid airliners have challenges
By Bjorn Fehrm
June 14, 2019, ©. Leeham News: In last week’s Corner we discussed why aircraft with batteries as an energy source will be short ranged for decades to come. The battery energy density is too low and it won’t change appreciably over time.
Now we look at the challenges hybrid transport aircraft face when competing with today’s turbofan airliners.
The Zunum Hybrid electric airliner. Source; Zunum.
Bjorn’s Corner: Why Electric Cars work and Airliners don’t
By Bjorn Fehrm
June 7, 2019, ©. Leeham News: In last week’s Corner I wrote: “The reason electric cars work and airliners don’t is the Sky lacks Stoplights“.
The discussion was part of my previous series on Electric aircraft, but it was in the comment section. Here is a more exhaustive run through of the main reasons.
Figure 1. The Tesla electric car is a functioning replacement for a combustion engine car. Source: Tesla.
Bjorn’s Corner: Electric aircraft, the first fall on the Hype curve
Bjorn’s Corner
May 31, 2019, ©. Leeham News: Last week the new Airbus CTO, Grazia Vittadini, said we should not expect electric aircraft anytime soon when presenting at Airbus Innovation days. What is realistic is hybrid developments, not battery-based designs.
After having made the basic checks about Electric aircraft in my Corner series 18 months ago, this was music to my ears. Finally, someone was curbing expectations.
Figure 1. The Gartner technology hype curve. We are somewhere in the first peak. Source: Gartner.
Bjorn’s Corner: Airbus about Urban Air Mobility: Stop dreaming, Start making
By Bjorn Fehrm
May 24, 2019, ©. Leeham News: “Stop dreaming, Start making” was the angle of Airbus responsible for Urban Air Mobility (UAM), Eduardo Dominguez Puerta, presenting during Airbus Innovation days in Toulouse this week.
He also said, over 90% of the present UAM projects will not make it into a certified operational platform. Here’s why.
Figure 1. The motivation for Urban Air Mobility is strong. Source: Airbus.
Bjorn’s Corner: Why I wouldn’t hesitate to fly on the MAX after the fix
By Bjorn Fehrm
May 18, 2019, ©. Leeham News: We are now two months into the grounding of the Boeing 737 MAX because of MCAS. Boeing announced yesterday it has finished the work on the fix and it’s now ready for FAA certification flights. Once FAA has certified the fix, the 737 MAX will return to the sky. At least this is how it used to be.
A lot of hesitation and distrust has come into the system since the March 13th grounding. Here’s why I wouldn’t hesitate to fly on the MAX after the fix.
