Tag: News

International Collaboration in Space

It’s only taken 20,000 years for Homo sapiens to migrate to the American continent and then decided to industrialise the Moon. Just imagine what the next 20,000 years has in store.

Putting nuclear power on the Moon is a possible enabler for a future Moonbase. Considering the length of time it has taken since the last footsteps on the Moon, a Moonbase is long overdue. That said, going to a faraway place where there’s an abundance of solar energy potential it’s an interesting development that nuclear power is given a priority.

My view is that exploration beyond Earth is a matter for the whole of humanity. Going to the Moon should be an international endeavour. There’s good reason to cooperate when it comes to exploration. For a start space exploration is incredibly hard to do. Rockets explode with an unsettling degree of frequency.

Modern humans have gone from tens of thousands on one continent to what may top ten billion on Earth. It’s no wonder space, the final frontier, beckons. Trouble is we have evolved as specialist on this planet. Not well adapted to the space environment. If our wandering species is to venture into the void, we need to be mighty determined. This will be hard. The hardest effort ever made.

It would be absurd for individual nations to establish separate camps on the Moon. The space race is a concocted nonsense. More flag waving PR than serious sense. Why do I say this?

One: Demand on resources, to build, develop and maintain, a space presence is high. Sharing costs has benefits when planning for the long-term. Continuing costs can be volatile.

Two: In the event of the almost inevitable failures and setbacks, better to have partners to create different ways and means to recover or mount rescues in the worst-case scenarios.

Three: Partners can specialise. Not everyone has to do everything all the time. Afterall, that’s how our modern society came about in the first place.

Four: Cooperative planning means more gets done at the same time. Duplication and fragmentation of efforts don’t serve the great goal of exploration.

Five: Earth’s people are interconnected and interdependent. Even small Moon based colonies will inevitably be the same. Reliant on connections, locally as much as to a distant home.  

As a spin off, making exportation an international endeavour can bring us together on this divided planet too. 

Data Interpretation

More on that subject of number crunching. I’m not so much concerned about the numerous ways and means to produce reliable statistics as the ethical factors involved in their production.

Two things. One is the importance of saying truth to power and the other the importance of seeing things as they really are rather than how you or I would like them to be.

Starting with the first. If ever it was a hard day to say this but asserting truth is not one of several options, it’s the best option.

Whatever any short-term gains there are in distorting a description of a current situation, in the longer term the truth will out. Now, that may not have always been so. It’s often said that the victors write history. That famous view had some validity when literacy was not universal or when texts were chained in church libraries. Now, information speeds through the INTERNET (and whatever its successor will be). Controlling or supressing information has become like trying to build a castle out of sugar on a rainy day.

The second factor is more troublesome and, for that matter, more difficult. It could be the tug of war between subjectivity and objectivity. What we see is so much dependent upon the observer. What we hear is conditioned by what we’ve heard in the past.

I saw this often in the interpretation of a written narrative. Aviation accidents and incidents are reported. Databases full of multivarious reports of different origins siting there waiting to be read. This is a good thing.

It’s the choice of language that shapes our understanding of past events. That can be voluminous and contradictory. It can be minimalist and ambiguous. It can have peculiar expressions or fuzzy translations. Even if reporters are asked to codify their observations, with a tick box, there remains wide margins.

The writer of a story often knows what they want to say. It might be obvious to them what happened at the time of writing. Then it’s the reader who takes that up. A text could be read years later. Read by many others. Similar stories may exist, all written up differently. Hopefully, slight variations.

Seeing things as they really are, rather than how you would like them to be, without bias, requires more than a degree of care. A great deal of care.

It’s hard enough for an enlightened and skilled analysist to take a sentence and say “yes” I know exactly what happened. Not just what but all six of these – who, what, were, when, how and why. In future, the artificial intelligence tools that get used by authorities will have the same challenge.

For all our technological wonders, it’s the writers of reports that shapes our understanding. From a couple of sentences to a massive dissertation.

Try telling that to a maintenance engineer whose last job of the day, before going home, is to file an occurrence report after a terrible day at work. In a damp hanger with a job only half done. Tomorrow’s troubles looming.

POST: Rt Rev Nick Baines and his Thought for the Day on BBC Radio 4 is thinking the same this morning. Truth is truth. In his case it’s Christian truth that he has in mind. There lies another discussion.

The Power of Numbers

If I was to give advice to a politician in power, it would go like this: numbers matter but don’t let them dictate the right course of action. Of course that’s fully loaded advice. The right course of action is subjective. That can mean expert or non-expert judgement of such a great wide range of felicity that it doesn’t bear thinking about.

For a long time, there was a mantra that organisational policy should be data driven. There’s quite a bit of wisdom in this statement as an alternative to arbitrary opinion and volatile reactivity. There’s no doubt an organisation is better off if it has a few able number crunchers.

I can recollect times when I’ve been advised to look favourably upon one way of presenting information as opposed to another way. Not that either was in error but that one way would reflect better on the management of an organisation. This is a perfect example of Lies, Damned Lies and Statistics[1]. Which is often nothing to do with lies but rather the presentation of information. Some would say manipulation.

Sacking a head of a Bureau of Statistics because the numbers their technical people produce are not favourable, well that’s one way to go. It’s the sort of action that’s take in devoutly authoritarian countries. Better not be embarrassing the higher ups at any cost.

Suddenly, I’m taken back to my “O” level history lessons. Our enthusiastic secondary school teacher who wanted us to love the Russian revolution as much as she did. It’s a fascinating but brutal period for Europe. Here I’m thinking of Stalin’s Five-Year Plans. A Russian official, in the late 1920s, would have been very unwise indeed to produce anything other than favourable statistics. However, for all the cruelty and suffering Russia did archive a rapid industrialisation.

Numbers matter. My dictum. If they are wildly inaccurate or manipulate numbers, they are worthless. Even presentational they are worthless because few will believe. Credibility is key but that’s often the issue. Who do you trust?

My domain has been aviation safety numbers. The analysis of these numbers can be of significant consequence. Going back to that data driven philosophy, if the numbers are wrong the direction of travel will be wrong. When policy making has an objective basis then it’s much easier to justify to a wide audience. There are advantages in having trustworthy numbers.

In the ideal world, a degree of independence is essential. This is so that the producers of statistics and associate information can endeavour to be accurate and unbiased. Doing this without fear or favour to any interested party can take some resolve. It’s only possible in an environment that is both inquisitive and respectful.

I say “degree of” as an observation. Just as investigators often follow the money trail, it’s as well to consider who is paying the bills. The analyst’s salaries must come from somewhere. Again, in an idea cultural environment where integrity and trust are valued, it’s not those who are funding the number crunching work that should determine (dictate) the results. Let the numbers speak.

The ideal world doesn’t exist but it’s clearly unwise to swerve away from it at speed.

[1] https://www.york.ac.uk/depts/maths/histstat/lies.htm

The Wit of Tom Lehrer: Songs That Endure

I was first introduced to the pastime of Poisoning Pigeons as a student. No, not literally. The idea of a leisurely Sunday sitting in a park dispatching pests that poo on the public has appeal. In reality, I’d never do that. Tom Lehrer’s comic composition[1] was enough. I have a lot of sympathy with the theme of his delightful song. Pigeons are, after all, merely disease spreading flying rats.

Tom Lehrer has left us a legacy of humour, the like of which we may never hear again. It’s so wonderful that his whole catalogue of songs is in the public domain[2] for everyone to enjoy until the day we all go together, when we go. Even I could have a go at a rendition of one of his songs, don’t worry it’s not my highest priority for the day. Beside matching his musicality, speed and timing isn’t within my meagre capacities.

Despite the massive changes that the world has been through since Tom’s pen went to paper a great number of the lyrics remain pertinent. I can sing “Pollution” loudly and think of the water companies in England. Like lambs to the slaughter, they (we) are drinking the water.

I can’t think of rockets, present or past without thinking of Tom’s song about Wernher Von Braun. Expedience seems to be the order of the day in 2025. Once the rockets go up who cares where they come down[3]. I’m sure the song wasn’t written about the Caribbean, but it could have been.

“The Folk Song Army” song is a nice dig at the pompousness of a certain kind of popular liberal musician. Something of our age. Where performance is more important than real action.

Sending up both the classics and the movie industry, “Oedipus Rex[4]” is pure genius. All such ancient stories should have dedicated title song. A complex complex.

Yes, Tom Lehrer was preaching to the converted. His sharp humour doesn’t normally travel across right-wing boundaries where they take themselves hideously seriously. He digs at the ribs of conservatives, tickles liberals and ridicules the absurdities of authorities.

Goodbye Tom Lehrer. Thanks for all the smiles. Thanks for your brilliant comic imagination. A shining star in the firmament.

[1] https://genius.com/Tom-lehrer-poisoning-pigeons-in-the-park-lyrics

[2] https://tomlehrersongs.com/

[3] https://www.wsj.com/video/spacex-starship-explodes-sending-debris-across-caribbean-sky/B828779B-D067-4290-A06D-77F60A6B501D

[4] https://tomlehrersongs.com/oedipus-rex/

Rapid Change: Social Media’s Role

I don’t think we understand the impact our world of superfast global communication is having on human behaviour. A digital event happens with a group looking on, and gasping, and within hours it’s a talking point across great swaths of the INTERNET and social media. Worldwide in seconds.

We could be at a pivotal moment of human evolution. Every time humans have progressed there’s been something in our environment that has necessitated change. If we go back tens of thousands of years, it was the climate. People moved, searching for better prospects. When the rains disappear, migration happened. This still happens. Millions live in that time warp.

However, for those of us who live in communities where our basic needs are met, bar disasters, it’s different forces that motivate change. I say this after having watched a couple episodes of “Human[1]” a BBC series about the origins of modern humans. Billions of us fixate not on finding enough food or shelter but on scrolling.

I’m talking about a couple who got caught on camera. Obviously, they thought that their evening out at a rock concert was a private matter. It turned out to be anything but private. Suddenly these two people spark controversy and debate without any intention of doing so[2]. We live in a time where global social media can thrust a spotlight on any event, almost anywhere. The proliferation of high-definition cameras and the ease with which pictures spread has all speeded up in the last couple of decades. Any picture or video can go anywhere on Earth at lightning speed.

Past moments of human evolution never had these superfast phenomena to adapt to. Sure, we have had great steps in technology. I read that people are taller now than they were in medieval times. Industrialisation may have had downsides, but we are mostly better fed as a result.

Social media is not benign. It grabs attention, it demands an opinion, it drives rapid judgement and gets passed on to spark more cycles of comment and opinion. This conveyor-belt of comment and opinion takes on a life of its own.

There’s such a mix that it’s not always easy to determine what’s true and what’s people pushing their own certainties and prejudices. Judgements are expected to be immediate. Any appeal to caution and considered thought can be seed sown on fallow ground. Like a Vicar in an empty church.

These behaviours are being applied to the daily News and events like the recent Air India accident. Attention increases when there’s tragedy and mystery. There’s wisdom in saying that people should wait for the formal accident investigation to conclude. Only this does nothing to impede a rain forest of judgements. Real and self appointed experts fight to get their view top billing.

Maybe these are ephemeral and of no great consequence. I don’t believe that because, like it or not, decision makers are influenced by social media’s compelling nature. What this says to me is that adaptation isn’t an option it’s a necessity. Appealing to past custom and practice isn’t going to work. I don’t have an answer as to the nature of this adaptation. Sitting quietly waiting for attention to subside isn’t a good course of action.

POST: It’s kinda funny that a magazine like WIRED highlights how to dump social media. How to Delete All of Your Social Media Accounts: Instagram, X, Facebook, TikTok, and More | WIRED

[1] https://www.bbc.co.uk/iplayer/episodes/m002fc72/human

[2] https://www.nbcnews.com/tech/tech-news/astronomer-responds-coldplay-concert-kiss-cam-moment-rcna219678

Lowering the Voting Age

The line-up of predicable grumpiness is no more than might be expected. For once the UK’s Government has decided to bite the bullet and make a long overdue change. It’s time to bring the voting age down to 16-years old. This is a policy that has long been advocated by Liberal Democrats. Wisely so. Like it or not, we have a stubborn geriocracy in Britan. Political influence is top heavy. An agenda dominated by issues toping the polls with older voters.

Yes, we did see changes, a year ago with the last General Election. More younger candidates winning. However, the average age of a Member of Parliament[1] floats around 50-years. This average age hasn’t changed much over decades.

Studies on what motivates candidates to stand for election often point to community engagement and activism being part of their lives. It’s only when, in mid-life, opportunities present themselves and support can be marshalled that they stand for election.

And the retirement community of the House of Lords is solely built on the notion that age brings wisdom. Sadly, so often this does not ring true. Ten minutes watching the Parliamentary channel is a good way to see a range of speakers from erudite to senile. From expert to confused. From informed to delusionary. On occasion a few sleeping on the comfortable red leather benches.

When the elderly hold so much political power it’s difficult enough to get 18-year-olds to take an interest in voting. This is not an argument for the status-quo. Far from it.

Those in the age group 16 to 18 years are interested in society and the direction it’s taking. Youth activism hasn’t entirely perished in the world of tick-boxing education. Loading students up with enormous loans, with learning establishments seeing them as revenue generators, and deaf ears to their concerns has done a lot to supress youth engagement in elections.

There’s a lot to be said for “no taxation without representation”. Young people do work. They do pay taxes. They should have a stake in how those taxes are spent.

What’s not to be presumed is that a new youth vote will automatically lean to the left of politics. It’s easy to make that sloppy assumption. It may arise because the prominent youth activist who get media exposure are those campaigning on environmental and social issues. That does not say much about the majority who may choose to go to a polling station.

I think the larger number of young voters, despite the media stereotypes, will likely vote the way of their parents and friends. Having been nurtured in a particular way this is not so surprising. The lazy stereotypes of riotous youths biting the hand that feeds them is only true of a few, it’s not the majority. It’s belonging to dusty Woodstock documentaries.

It’s for the political parties to up their game and campaign with young people in mind. Even with the best of efforts election turn-out is still likely to be low. At least the message is that the next generation matter. If these modest changes are blocked because older people fear the next generation that is a very sad reflection of our society. Surely, it’s better to have younger people invested in their communities. 

[1] https://www.parliament.uk/about/faqs/house-of-commons-faqs/members-faq-page2/

The Greasy Pole

I think we should be indebted to the writers of “Yes Minister.” And the brilliance of Paul Eddington, Nigel Hawthorne, and Derek Fowlds[1]. No mobile phones, lap-tops or tablets, wood panelled offices, a Minister with all the backbone of a jellyfish and the cunning and mountainous pomposity of Oxbridge’s best.

It’s the ultimate lesson for aspiring British politicians. Fresh faced, with ambition and desire to make a difference they are confronted with the custom and practice of centuries. A bureaucratic minefield that tops anything Brussels can produce.

At first, it’s easy to see Jim Hacker as naive to the point of merely being indulged by the civil service. He learns fast, as a good parliamentarian should always do. Fun being seeing him turn the tables on the Whitehall establishment. Often at the expense of hysterically awkward moments and sporadic cynical manoeuvrings.

Last night, I watched “The greasy pole”[2]. Without a doubt this episode remains 100% relevant. It first went out in 1981. The story’s themes are universal.

A proposed industrial development offers secure jobs and potential prosperity. It comes with a hitch. Activism and noisy protests aimed against the project. Industry and the civil service want the factory to get built. The Right Honourable James Hacker sits on the fence. Blows hot and cold but realises that his political career pivots around sinking the project. The Minister wins out in the end much to the discomfort of the department officials.

It would be easy to write the entire plot in terms of 2025’s political difficulties. This morning’s News ran a story that wasn’t so far off the plot of “The greasy pole.”

A new Labour government minister tells of publishing a report that favours a point of view he wishes to get across. He continually mentions the name of the author of the report. Mimicking Jim Hacker as he makes sure everyone knows the report’s author, just in case he’s made a mistake.

Although, with the complete ridiculousness of the past British Conservative governments it may have been said that satire is dead. No, it certainly isn’t. Here it was playing out on the BBC on my kitchen radio at breakfast time.

This is the stubborn reality. In Britain we have a new absurdly named political party called “Reform.” They are flying high in the opinion polls because some people think the word has a political meaning. However, if these would be politicians were to gain a position of power, would they conduct long-needed reforms? Well, given the competence of the people involved and given the historic clashes between elected officials and civil servants the answer is most certainly – no.

It seems to me that new Labour government ministers are slowly getting the hang of the job. One year in they are still a bit wet behind the ears. Gradually, they are climbing the greasy pole. At any moment, because of the nature of the job, down they can come, and they know it.

[1] https://www.bbc.co.uk/iplayer/episodes/b006xtc3/yes-minister

[2] https://www.imdb.com/title/tt0751819/

Aircraft Safety and Fuel Starvation

Unsafe. In common language it’s the opposite to being safe. So, take a definition of “safe” and reverse it. Let’s say to be safe is to be free from harm (not a good definition). That would lead to “unsafe” being subject to harm or potentially being subject to harm. The probabilistic element always creeps in since it’s the future that is of concern. Absolute safety is as mercurial or unreal as absolute certainty.

Let’s apply this to an aircraft. The ultimate harm is that of a catastrophic event from which there is no escape. Surprisingly, taking a high-level view, there are few of these situations that can occur.

Flying, and continuing to fly, involves four forces. Lift, Weight, Thrust and Drag. It’s that simple. An aircraft moves through the air with these in balance. Flying straight and level, lift opposes weight and thrust opposes drag.

Yes, there are other safety considerations. If there are people on-board. For example, it’s important to maintain a habitable environment. At higher altitudes that requirement can be demanding. Structural integrity is important too. Otherwise flying is a short-lived experience.

In the recent Air India fatal accident, the four forces of flight were not maintained so as to make a continued safe flight possible. The wings provided lift but the force that was deficient was thrust.

Two large powerful engines, either of which could have provided enough thrust, were unable to do so. The trouble being fuel starvation. Fuel starvation occurs when the fuel supply to the engine(s) is interrupted. This can happen even when there is useable fuel on board an aircraft[1].

Sadly, in the records there are numerous aircraft incidents and accidents where this has happened. Quite a few fuel starvation incidents and accidents occur because of fuel mismanagement. This can result from a pilot selecting an incorrect, or empty, fuel tank during a flight.

Now and then, it is the aircraft systems that are at fault. The pilot(s) can be misled by a faulty fuel indication system[2]. In one notable case, a major fuel leak drained the aircraft’s fuel supply[3].

When there is useable fuel on-board an aircraft, the imperative is to restart and recover. It is not uncommon or unreasonable for there to be a delay in restarting engine(s), especially when a fuel starvation event is entirely unexpected. Diagnosis takes time given the numerous potential causes of a starvation event.

In cruise flight there is time available to perform a diagnosis and take appropriate corrective action. Both take-off and landing have their hazards. Both are busy times in the cockpit. When looking at the worldwide safety numbers, less fatal accidents occur on take-off than landing. The numbers Boeing provide put take-off at 6% and landing at 24% of fatal accidents. Each one only occupies about 1% of the total flight time.

Although these are the numbers, my view is that, even though take-offs are optional and landings are mandatory, the requirements for adequate thrust are most critical during take-off. This is arguable and it reminds me that safety assessment is never simple.

[1] https://www.faa.gov/lessons_learned/transport_airplane/accidents/G-YMMM

[2] https://asn.flightsafety.org/asndb/322358

[3] https://asn.flightsafety.org/asndb/323244

Understanding Boeing 787 Avionics

In what I’ve written so far, I’ve taken the humancentric view much as most commentators. The focus of interest being on what the two Air India crew members were doing during the critical moments of this tragic flight. Let’s shift perspective. It’s time to take an aircraft level view.

On the Boeing 787-8 “Dreamliner”, the flight deck has two crew seats and two observer seats. One observer seat is directly behind and between the two crew seats. Since these observer seats are not mentioned in the preliminary report, it’s responsible to assume that they were unoccupied.

In my days working on civil aircraft certification, it was often as a part of a multidisciplinary team. I suppose one of the privileges of working on aircraft avionic systems is that they touch every part of a modern civil aircraft. That meant working with highly experienced specialist in every technical field, including flight test pilots and engineers.

When it came to reviewing aircraft system safety assessments, we’d often put it like this, you look at the aircraft from the inside out and well look at the aircraft from the outside in. Meaning that the flight test team looked at how the aircraft flew and performed. Systems engineering specialists focused on how the aircraft functioned. What was the detailed design, the means and mechanisms. It was by putting these differing perspectives together that a comprehensive review of an aircraft could be established.

Here’s where I need to be careful. Although, I worked on the technical standards1 for complex aircraft systems, I did not work on the Boeing 787 at initial certification.

If I go back 25-years, a major change that was happening with respect to aircraft systems. It was the move to apply Integrated Modular Avionics (IMA). This was a move away from federated systems, where just about every aircraft function had its own box (autopilot, autothrottles, instruments, etc.) There was a fundamental architectural difference between federated and IMA systems.

The Boeing 787 has what is called a Common Core System (CCS). As an analogy let’s think of a time before the smart phone became universal. I had a Nokia mobile phone, a Canon camera, a HP calculator, a Dell lap-top, lots of connectors and pen and paper. Now, the only one that has survived the passage of time is the pen and paper.

So, it is with modern civil aircraft. An Integrated Modular Avionics (IMA) hosts the applications that are necessary for safe flight and landing. The IMA hosts functions that provide, Environmental Control, Electrical, Mechanical, Hydraulic, Auxiliary Power Unit (APU), Cabin Services, Flight Controls, Health Management, Fuel, Payloads, and Propulsion systems.

Information is digitised (sensors, switches and alike), processed and then acted upon. General Processing Modules (GPM) inside the aircraft CCS perform the functions needed. There’s an array of these GPMs and redundancy to provide a high integrity aircraft system.

An aircraft’s Fuel Shutoff Valve Actuator depend on the above working as intended in all foreseeable circumstances. No doubt the accident investigators are undertaking an analysis of the Boeing 787 avionics architecture to gain assurance that it worked as intended.

  1. Standards: EUROCAE started a working group (Number 60) in September 2001, which was tasked to define guidance. Later, in November 2002, there was a merge with an RTCA steering committee (Number 200). ↩︎

Fuel Control Switches

I’ll not go any further than the investigation report that’s in the public domain. The Air India AI171 Boeing 787-800 Preliminary Report is published for all to read. The aircraft’s Enhanced Airborne Flight Recorder (EAFR) has been replayed. Sadly, this report raised questions as much as it closes down erroneous theories.

It warrants saying again, and again. My thoughts are with the friends and families of those affected. They deserve to know exactly what happened and as far as is possible, why. Not only that but the global travelling public need to be confident that any necessary corrective action is being taken to prevent a recurrence of such a rare fatal accident.

What requires a one or two words is one of the commonest ways we interact with electrical and electronic systems. The humble switch. In fact, they are far from humble and come in lots of shapes and sizes. The general idea is that a mechanical device, that can be manipulated with a purpose in mind, is used to control the flow of electrical current. There are non-mechanical switches, but I’ll not go there for the moment.

I remember conversations with my aircraft electrical engineering colleagues. It goes like this – you deal with the small currents (avionic systems), and we will deal with the big ones (power systems). Also, a mantra was that all electrical systems are, in part, mechanical systems. Switches, cables, generators, control valves, relays, bonding, you name it, they are in part, mechanical systems. In the past traditional electrical engineers got a but jittery when faced with “solid state” controls (semiconductors).

Switches. I’ve seen the words “cognitive engagement” used. In simpler terms, by design, pilots interact with switches with a purpose in mind. Equally, as in the world of human factors, unprotected switches can be operated in error, unintentionally or by physical force.

So, what are the chances of two protected Fuel Control Switches moving, within seconds of each other, at the most critical phase of an aircraft’s flight?

[There is a discussion to be had in respect of timing. Remember the record from the flight recorders is a sampling of events. The sampling rate maybe as low as one per second. Note: EASA AMC2 CAT.IDE.A.190.]

These cockpit switches are designed and certificated to perform as intended under specified operating and environmental conditions. That’s a wide range of vibration and temperature (shake and bake).

Switch operation is indicated by their physical position[1]. In addition, operation of these switches will be evident by cockpit indications. The concept being that a flight crew can confirm that the Fuel Control Switches have moved by their effect on the engines. If a crew need to take corrective action it is in relation to the information presented to them by the engine instrument system.

The report makes it clear that both mechanical switches transitioned from ‘RUN’ to ‘CUT-OFF’ almost immediately as the aircraft became airborne. That is a worst-case scenario. The time available to recognise and understand the situation, for training to kick-in, and then to take appropriate corrective action was insufficient.

This leads me to think that there may be a case for disabling the Fuel Control Switch function up until at least an altitude where aircraft recovery is possible. Now, these switches need to be available up until the V1 speed is achieved (Example: aborting a take-off with an engine fire). After that an aircraft is committed to becoming airborne.

I suspect the reason there is no inhibit function is the possibility of adding another potential failure condition. Inadvertent and unrecoverable disabling of ‘CUT-OFF’ are scenarios that would need to be considered. No doubt a reasonableness argument was used. No crew would shut-down both engines down immediately an aircraft became airborne, would they?

POST: I hope I haven’t given the impression that this is a case of simple switches and wires. The Boeing 787 is a digital aircraft.  Mechanical fuel technology plays its part but control functions are digital.

[1] Designs that offer switch illumination are not used in this case.