Tag: Travel

Navigating Heights

If I were to explain, the reasoning would go like this. It’s good to have a vivid imagination. As an engineer, it’s essential to be able to create a mental picture of what’s happening. But there’s a downside. Looking at a situation and seeing more than is there, opens the door to imagining all sorts of scenarios that are unlikely.

I’m talking about that experience of peering over a cliff edge to see what’s there. Curiosity being a strong urge. Then pulling back in fright of falling. Often when the ground is solid and safe. Often when nothing more than a spark in the imagination creates an unreasonable fear of falling. The fleeting image I have in mind is looking down at Beachy Head Lighthouse[1].

I have a curious relationship with hights. No, I’m not terrified of heights. It’s just that now and then that fear of falling does kick in. This feeling could be embedded or learnt from an early age. My mother tells a story of me as a toddler being halfway up a ladder. Sacring her. Me being oblivious to any danger and coming to no harm. Growing up on a family farm there was innumerable hazards around every corner.

One of the riskier things was to climb up the haybarn roof. This was an open steel framed structure spanning several bays. Corrugated sheets made up its roof. In the UK, we call these buildings a Dutch barn. This mostly refers to the curved shape of the roof. From the top of the barn, it was possible to see the whole farmyard.

Last week, I hiked around the Caldera de Taburiente on La Palma. I learnt that the term caldera has Spanish origins. So, I was in the right place to assess any fear of hights that might linger in my psyche. The Caldera de Taburiente is more than 2000 m deep.

Even the roughly hewn paths, some restored from local landslides, didn’t phase me. It’s as if, because I was one of thousands who have passed the same way, the dangers where contained. In fact, there were not. Some of the well-worn slippery stones underfoot had to be approached with a great deal of caution. Loose rocks and sheer drops had to be navigated with care.

The Caldera de Taburiente National Park is a magical place. It has a Jurassic Park feel about the place. Given that it’s not much more than a few million years old the place is far to youthful for dinosaurs. It has its own special natural beauty.

My aging but persisting vivid imagination had plenty to occupy itself as we climbed and descended in and out of the park. The whole hike was about 16 km. This was the second time I’d taken this circular route. What surprised me was the hard parts of the climb and decent following a riverbed on the way out. That part I’d conveniently forgotten.

No, I’m not terrified of heights when there’s solid ground underfoot. They do however have the capacity to scare or at least summon up a lot of extra care. I hope that inbuild sense of self-preservation never fails me.

[1] https://www.beachyheadlighthouse.co.uk/

Illusion of Sovereignty

Desperate for something to say because their arguments have been shot down in flames, those who continue to support Brexit raise the subject of sovereignty. It’s as big a red herring as you are likely to find. That said, the notion of complete autonomy does have a resonance with one part of the political class.

One example of reality being different from political rhetoric is one I regularly see. I’m driving more than I have done in a while. Mostly, on the M4, M3 and M25 motorways. In this country some freight goes by rail, but the overwhelming amount of freight goes by road.

A sign of our times has been the construction of massive warehouses close to motorway junctions. Strategic non-motorway routes too. I do mean massive steel sheds. Counting the number of football fields covered by these structures doesn’t help. I’ll bet some of them can been seen from space.

Back to the British roads. 6-wheelers, 8-wheelers, 12-wheelers, big heavy trucks often showing the wear and tear from journeying great distances depend on the motorway system. A constant flow of heavy goods moves day and night.

Looking at the trucks, some have UK registration plates, some have UK registration plates thrown over their original plates. Most drive under the registration plates of a country of origin or wherever their commercial operations are based. Each plate tells a story. LT is Lithuania. PL is Poland. H is Hungary. NL is Netherlands. D is Germany.

So, every day we have tens of thousands of trucks maintained and operated to standards set by the European Union (EU) on our roads. They are left-hand-drive. Their speedometers are in kilometres per hour.

It occurs to me – what does “sovereignty” mean when everyday looks like a day driving?

For sure, no British inspector checks the condition of each one of these trucks on a regular basis. For sure, truck driver’s hours are only occasionally checked. For sure, maintenance records are locked away in a filing cabinet.

In the world of absolute sovereignty none of this should be allowed. In fact, much of the above-described transport operations are continuing as they did before Brexit but with extra paperwork attached. Extra costs.

It’s an observation. It’s easily made when stuck between a couple of heavy goods vehicles on the motorway. Pragmatism may have led to a blind eye being turned to reality. We shouldn’t delude ourselves that Brexit has delivered anything useful in this respect.

Travel Educator

Travel is the great educator. Fundamentally – yes. My ordinary every day is extraordinary to someone. Just as their ordinary every day is extraordinary to me. There’s so much we take for granted, and we must, that we forget how strange our customs and practice can be.

Even if it’s so simple as bumping into people when they walk on the right and I walk on the left. Or I sneeze and the obligatory and automatic “bless you” takes me by surprise. Greetings can come as a shock too. Whereas if someone says, “are you going the same way?” might be taken as the introductory line of a serial killer in London, in a small country town it’s just a polite inquiry by a genuinely interested fellow traveller.

Does travel teach social skills? I’m not so on-side with that view. There’s no doubt that it can be a way to meet like minded people. That can often, on the downside, be a local bubble. Ending up chatting to likable people who are going through similar experiences. Identifying not with the people around but those who are similarly placed.

What’s a more regular encounter is the tall guy with the sharp elbows who doesn’t acknowledge that the person in the middle seat, namely me, is annoyed by how little care he’s taking with his lanky arms and legs. I suppose, if such occasions teach me anything it’s to not do what is being done to me. Especially when a homeward bound aircraft is on hold, going round and round, in bad weather trying to get into Heathrow. Time stands still.

One of the best realisations that flows from travel is that there’s a common humanity lurking everywhere on the planet. On the other hand, it’s not always obvious or the first encounter. I think, most people sit in the camp of being indifferent or helpful. Yes, a small percentage are out to do no good. Thankfully, they are a small percentage and best avoided at all costs.

Another realisation is that uncomfortable situations, like being lost after having misread the map App on my phone, are all part of life’s colourful pageant. There maybe moments of concern. I don’t like to use the word – fear. There’s generally a pathway back to the more familiar.

I’m not for one moment advocating taking unnecessary risks. Before wandering around any major city, it’s as well to do some research. To get a rough appreciation of the geography and what goes where. Like a layout of the metro map. It’s nice to have tall landmarks that sit of the skyline. The sun and a wristwatch always offer the most rudimentary navigation aides. Knowing that a river crosses the city or tourist congregate in a certain place works at nighttime.

If I probe my decades of memories of travel, a lot of vivid recollections come from unexpected discoveries. Afterall, part of travel is returning home and having stories to tell.

Tragic VoePass ATR72 Crash

2024 was going so well. Looking at the indicator of worldwide fatalities in commercial aviation for the first six-months of this year, and it is exceptionally low. The time between major fatal accidents across the globe is another indicator that my team once looked at on a regular basis. Aviation is an extremely safe mode of transport but when accidents happen, they can be devastating.

Yesterday, the situation changed in Brazil. A VoePass ATR72-500 aircraft[1], registration PS-VPB, flight number PTB2283 crashed in the Brazilian state of São Paulo. The twin-engine aircraft crashed in a residential location.

Yet unknown events resulted in a loss of control in-flight. On-line videos of the aircraft flying show a dive and then a spiralling decent to the ground. The aircraft was destroyed on impact, and it is reported that all lives were lost.

The publicly available flight data shows a sudden decent from a stable altitude[2]. The aircraft was about and hour and twenty minutes into its flight.

Looking at the video information it might appear that local weather may not have been a factor in the accident. However, there was known to be severe icing conditions at the altitude that the aircraft was flying.

It’s speculation on my part but unrecognised severe icing is one of the conditions that can bring about a catastrophic outcome for such an aircraft. It is sad to have to say that there is a record of a major accident to an ATR-72 that has some of the characteristics of this new accident.

In fact, it is one fatal accident that is etched on my mind given that it happened in late 1994, when I was still fresh in my job with the UK Civil Aviation Authority as an airworthiness surveyor. It’s known as much by its location as by the name of the aircraft, namely Roselawn[3]. The accident was extremely controversial at the time.

Crews are told that they may be operating in severe icing conditions but there is no specific regulatory requirement for on-board advisory or warning system on this generation of turboprop aircraft. An ice detection system can serve as a final warning to alert a crew that ice protection is needed.

Work to update the technical document; In-Flight Ice Detection System (FIDS) Minimum Operational Specification EUROCAE ED-103 is completed. Issued in April 2022, ED-103B – MOPS for In-Flight Icing Detection Systems is available[4].

In the case of the current accident, it is a matter for Brazil’s highly capable independent accident investigators to determine what happened. Anything I have written here is purely speculative.

POST 1: Reports of statements made by Agência Nacional de Aviação Civil (Anac) say that the aircraft was in good condition.

POST 2: Accident flight recorders have been recovered from the accident site. Flight recorders retrieved from crashed Voepass ATR 72-500 | Flight Global

[1] https://asn.flightsafety.org/wikibase/409335

[2] https://www.flightaware.com/live/flight/PSVPB/history/20240809/1450Z/SBCA/SBGR/tracklog

[3] https://www.faa.gov/lessons_learned/transport_airplane/accidents/N401AM

[4] https://eshop.eurocae.net/eurocae-documents-and-reports/ed-103b/

Sainsbury’s Sanctuary

As I left Reigate the temperature was up at 30C. It was oppressively hot. Sticky and brewing an immense storm. Not that I minded so much, since I seem to thrive in the heat. Dark shades on. Lightest tee-shirt I could find. Primative old iPhone 4S blasting out an upbeat medially.

Sitting in my black car, on black leather seats, with an air conditioning system that cessed to work about a year ago, was a special kind of heat treatment. Windows open. It was like being blown by a powerful hairdryer from two sides. Fortunately for me London’s M25 was moving. Going west. Maybe wiser people than me had made a choice to delay their journey, or not go anywhere at all. In between the eight wheeled trucks, the shafts of sunlight rained down like a Martian death ray.

Grassy embankments that had been lush green earlier in the year were now charred brown. Motorway roadworks that had been bogged down in slimy mud now dust bowls. Colourful heavy earth moving machinery working on its limits. Roadworkers looking as if they would rather be anywhere but where they were. Lucky ones sheltering in the shade.

My journey had not been without basic planning. I knew that the heaviest of storms was slowing making its way west to east across southern England. I got almost a quarter through my trip before the immense thunder clouds loomed off in the distance. The sunlight was slowly changing. Going from perfect clear blue skies, with a little haze, to a brooding caldron of shafts of bright light and rolling off-white clouds, towering up to the stratosphere.

Onto the M3 motorway going west. Through the roadworks. The perpetual roadworks, Where the nation’s highway planners are trying to correct mistakes that they made erecting “smart” motorways. Closing the running hard shoulder to erect new emergency stopping bays.

Still the temperature was shifting up and down around 30C. Would I get to my motorway exist before the downpour that now seemed inevitable? I slowed to let a heavy truck into the nearside lane. We were both keen to get off the gradually slowing motorway.

Almost as if I’d timed the weather and pressed a button for rain, it started on the slip road. Trickles at first. Dark grey skies and indications of what was to come. My car’s dashboard thermometer started to plummet. By the time the traffic lights turned green, and we passed over the M3, visibility was disappearing. In a mishmash of road traffic on that junction there was potential for every kind of accident.

Time to slow down. It doesn’t matter that the duel carriageway signs going north said 40 mph. It would have been foolish to speed beyond that limit. At that moment the monster storm was just getting going. The timing between lightning strikes and thunder was shortening. Still, I had a good 5-miles to go to a sanctuary.

Again, almost as if I’d timed the weather, I exited right to turn into a Sainsbury’s superstore as the dark monster above our heads did its worst. Great pools of water where splattered on the ground with rain falling like millions of tennis balls. It was time to sit out the storm and take a coffee. Already the temperature had dropped ten degrees.

My cosy coffee shop sanctuary was the number one best place to watch shoppers getting soaked as they trudged across the windswept car park. I certainly wasn’t going to be in that kind of hurry. I sat it out. Glad I did.

Electric Aviation: The Promise of Clean Flight

Electric aviation is not new. Not new at all. The engineers of the past struggled with two factors. Power and weight. A French electrically powered airship was the first aircraft to make a controlled circuit. On 9 August 1884, it flew a circular course of 8 km at a max speed of 14.5 mph. Its electric motor weighed 100 kilograms and its battery weighed 263 kilograms.

It’s not a problem to be able to distribute or use electrical power on-board an aircraft. The problem come in generating enough of it from a reliable source. Today’s “conventional” civil aircraft generate and use large amounts of electrical power. For example, the Boeing 787 has two starter/generators per engine[1]. Electrical power from the generators goes to four alternating current (AC) electrical distribution buses, where it is either sent for use as is (235 V AC) or converted for use by the aircraft systems that need it.

A revolution is taking place in electric aviation. It offers the opportunity to fly cleanly. That said, the traditional technical challenges remain the same. Power and weight. In 140-years battery technology has advanced considerably. But is that enough?

A difficulty that battery powered flying is stuck with is that at the start and at the end of a flight the batteries weigh, more or less, the same as they did from the day of their manufacture. Today’s “conventional” civil aircraft consume fuel. Thus, they are significantly lighter at the end of a flight than they are at the start. Airframes can be designed to take advantage of this fact.

One of the up sides is that a good electric motor can get to an efficiency of 80% whereas a turbo fan engine comes in at around 35%. That sound great until we look at the amount of energy we can store within a given volume. Jet fuel packs a punch. To get the same punch from an electrical battery it would likely be 15 times the size. That’s not good for a practical design. The low battery energy density coupled with the high weight of batteries means that this strategy for large aircraft needs to be put to one side for now.

A modern aircraft engine like the CFM International LEAP, can develop a max take-off thrust of over 30,000 lbf. Two of those engines can safely accelerate a Boeing 737 or Airbus A320 with ease and cruise with good economy. Thus, electrification of the propulsion of this class of aircraft is a long way off. The nearest possible future for propulsion of a B737 and A320 sized aircraft may be hydrogen based.

This explains why the drawing boards are full of small electric aircraft designs where performance demands are more modest. There’s a hope that the continuous development of battery technology will provide year on year gains. Much more than aviation alone demands that battery technology advances.

Developments in hydrogen-electric aviation are catching the headlines. Much of what has been achieved is experimental. I look forward to the day when hydrogen is not used to fill airship gas bags but becomes the life blood of transport aviation. It’s conceivable that will happen in my lifetime.

[1] http://787updates.newairplane.com/787-Electrical-Systems/787-Electrical-System

Turbulence

Turbulence is the result of atmospheric or environmental effects. Afterall, aircraft are craft that fly in the air. This is a hazard that is inherent in flying. Clear air turbulence (CAT) is common. However, extreme examples experienced in commercial aviation are rare. For one, aircraft operators and their crews do their best to avoid known potential atmospheric or environmental upsets, namely bad weather.

En-route turbulence accounts for a substantial number of cabin crew members injuries, and can occur at any time and at any altitude[1]. As far as I know, the UK Civil Aviation Authority (CAA) does not hold detailed data on turbulence injuries occurring on foreign registered aircraft. Numbers of injuries to passengers and flight crew on UK registered aircraft resulting from turbulence are recorded. However, it is not always known whether those injured in turbulence encounters were wearing seat belts.

Nevertheless, I can confidently say that the more passengers that are wearing seat belts during turbulence encounters the less the number of injuries. Deaths in these circumstances are rare. As might be expected fatalities are more likely to results from a combination of multiple causes and factors.

This subject is not immune from airline economics and competition. International flight routes can often be highly competitive. Fought over. So, the route taken, and associated fuel costs, can have an impact on the likelihood of a hazardous weather encounter. In fact, choosing to take routes for the benefit of picking-up specific winds is a common practice.

A high percentage of cases of turbulence events come about by flying too close to active storms[2]. Here there is often visual cues, reports, forecasts and feedback from turbulence encountered by other flights. This all helps crews avoid the worst weather encounters.

With very few exceptions, flight turbulence does not result in fatalities, permanent injure, or structurally damage commercial aircraft. However, turbulence is recognised as both an aviation safety and an economic issue, and it has been steadily increasing. Speculation and some research cites climate change as a reason for this increase. Also, there is the international growth in air traffic and development of new long-range routes.

One thing to say is that until recently, with INTERNET connections now in both in the cockpit and cabin, it could be the case that a passenger could access better real-time weather information than a flight crew. Now, SATCOM connections providing up-to-date weather information are more common on modern civil aircraft types.

There is still more that can be done to reduce crew and passenger injuries during turbulence encounters. There will inevitably happen despite any policy to avoid hazardous weather. The greatest threat to life exists to cabin crew. The cabin is their place of work.

There is potential to develop and employ better airborne detection systems to assist crews. That maybe by enhancing existing weather radar systems. It maybe by new means of turbulence detection using LIDAR, and possibly AI/ML. There is research and innovation that could be done to develop algorithms to better predict turbulence hazards.

Avoidance remains the best strategy.

[1] NASDAC Turbulence Study, August 2004

[2] US CAST briefing in 2004.

Hydrogen in Aviation

The potential for LH2 (liquid hydrogen) is enormous. That’s matched by the logistical and technical difficulties in exploiting this gas’s great potential. It offers energy for a means of propulsion that is nowhere near as environmentally damaging as existing means.

Society already integrates hazardous liquids and gases into everyday life. Each one has been through several iterations. It has been a rollercoaster. Each one has been at the root of disasters, at one time or another.

  • We use gas for cooking and heating in domestic settings. Periodically explosions demolish buildings. Leaks cannot be ignored. Harm can be done.
  • We use light and heavy oils widely in transport systems. Periodically intense fires burn vehicles. Care in handling is essential. Harm can be done.

Without having to say it, both above harm the environment. The search for non-CO2 emitting ways of flying is urgent. Here, I’m writing about harm to people. Physical harm. The business of aviation safety.

Often the physical harm is not associated with the design of the systems used but to the maintenance of those systems. Naturally, there was a learning curve. If we look at early versions of those systems, fatal accidents and incidents were far more regular. So, here’s the challenge for aviation. How do we skip the dangers of the early learning phase? How do we embed rigorous maintenance practices from day one? Big questions.

On the first one of these, lots of fine minds are engaged in putting together standards and practices that will address good design. If this works, and it will be tested extensively, the chance opens for introduction to service with a great deal of confidence that the main risks will be managed.

On the second of these, there’s not much happening. You might say there’s an element of chicken and egg. The shape and form of future LH2 systems needs much more work before we can think deeply about how they will be maintained.

I think that’s wrong. It’s old-fashioned thinking. As the industry has often practiced, making the systems first and then devising ways of maintaining them while in-service. That’s yesterday’s reasoning.

Making aviation system maintenance the Cinderella in the LH2 world is to invite failure. This is a situation where advancing the consideration of how the in-service realm could work, day by day, is necessary. It’s advantageous.

Here’s my reasons.

  1. There are generic approaches that can be tested without knowing the detailed design. That can take existing learning from other industries, like chemical and space industries, and consider their application in aviation.
  2. Emerging technologies, like machine learning, coupled with large scale modelling can provide ways of simulating the operational environment before it exists. Thereby rapidly testing maintenance practices in a safe way.
  3. It’s imperative to start early given the mountain that needs to be climbed. This is particularly true when it comes to education and training of engineers, flight crew, airport and logistics staff and even administrators.

Everyone wants to accelerate environmentally sustainable solutions. When they do get to be in-service, they will be there for decades. Thus, an investment, now, in study of maintenance systems will pay dividends in the longer term. Remember, early fatal accidents and incidents can kill otherwise sound projects or at least put them back on the drawing board for a long time.

NOTE 1: I didn’t mention Liquefied Petroleum Gas (LPG). It’s in the mix. Another CO2 contributor. LPG containers have pressure relief valves. LH2 containers will likely have pressure relief valves too. That said, venting LPG is a lot more environmentally damaging than LH2. From a safety perspective they can both create explosive conditions in confined spaces. Maintenance staff may not need to carry a canary in a cage, but they will certainly need to carry gas detectors when working on LH2 powered aircraft. Our noses will not do the job.

NOTE 2: Events on the subject: https://www.iata.org/en/events/all/iata-aviation-energy-forum/

https://events.farnboroughinternational.org/aerospace/sustainable-skies-world-summit-2024

2024 ICAO Symposium on Non-CO₂ Aviation Emissions

AAM

This week, I watched an FAAs Advanced Air Mobility (AAM) webinar[1]. The subject was community engagement. AAM could be air taxies but it’s many uses of the new electric aircraft that are becoming a reality. The term eVTOL is used for those aircraft that have the capability of vertical flight. My reflection is that there are several aspects of AAM that need much more attention. Naturally, I’m taking the discussion of what’s going on in the US and thinking about it in relation to the UK.

  • Land Use Planning

Generally, National Aviation Authorities (NAAs) are consultees when it comes to land use planning. They do not determine planning applications. NAAs may well have set out policies and guidance on the subject but they will not be determining the site of vertiports.

It seems to me that there’s little chance that eVTOL aircraft routes will be established without sufficient community consent.  Community engagement has been appropriately recognised as essential. The aspects in play are like those for existing aerodromes. Often for AAM applications proposals are for the use of new locations, hence a concern. Anytime there’s a serious proposal for a new aerodrome the opposition is up and running long before the proposers have got their act together.

The subject is complicated by the mix of public and private ownership of infrastructure. If the intention is to interconnect AAM with other transport services (bus/train/boat/road), then complicated agreements are going to be inevitable. It’s not just about buildings and tarmac but having a trained workforce available is a location dependent issue too.

  • Business Models

I’m about to sound as if I’m securitising the plans of a contestant on The Apprentice[2]. There are plenty of way of losing money in commercial aviation. It’s been a well-practiced art over the years. Great ideas fall by the wayside after huge amounts of money have been expended. Customers are key. People must want to fly the routes available, time and time again. And like London Black Cabs be prepared to pay the fare. Given the relatively small cabin sizes that are on offer these people are likely to be moderately prosperous groups or individuals.

Regular schedules air services can produce a reliable income. Airport-to-airport connections seem like a good bet. Problem there is the conveyancing of weighty luggage. Busy airspace could be a challenge too. That said, with tens of thousands of people at both ends of a route, no doubt some people will choose a comfortable, speedy direct connection.

There are good possibilities for major event driven transport services. Getting to and from a motor race or horse race event or a concert or festival can be hell when tens of thousands of people are all trying to get to and from a location or venue. The numbers may well stack-up to make eVTOL a premium way of dodging the crowds in an environmentally sound way.

  • Batteries, Batteries, Batteries

Everything in respect of aircraft performance depends on power density. How much oomph can you get out of a small, light weigh physical space. Recharge and go. Do it, again and again. It’s as simple as that. Not only that but aircraft battery packs must be affordable and available. Whizzy technology that cost a mountain of cash and can only be use for a few hundred cycles is no use at all.

Power distribution infrastructure must be up to the job too. Who will pay for this is up for grabs. There’s a good case for public funding given that there are multiple uses of enhanced electrical supply. Given the monopolistic nature of power generation and distribution this will not be easy or quick.

That’s only three issues that require a great deal of attention. Not the attention of researchers. Not the attention of academics, Not the attention of political policy wonks. Connecting entrepreneurs and public bodies needs practical stimulus. The possibilities are exciting.

[1] https://youtu.be/1sfVuJlPQoY

[2] https://www.independent.co.uk/arts-entertainment/tv/news/the-apprentice-2024-winner-pies-b2531331.html

Highways

The last time I visited the city of Baltimore was in 2012. It was the location of the annual seminar of the International Society of Air Safety Investigators (ISASI)[1]. That was when I was representing the European Aviation Safety Agency (EASA) at such international events.

The relationship between aviation accident investigators and regulators are generally cordial. There’s a great deal of work that requires cooperation and good communication. That’s not to say that the relationships between these two vital parts of national and international aviation safety systems is easy. It’s not. My reflection on that fact is that a degree of constructive tension is inevitable and not always a bad thing.

One way of seeing that relationship is that the primary role of an investigator is to make findings to prevent the repeat of a given accident. For a regulator the primary role is to ensure the complete aviation system runs safely on a day-to-day basis. Both organisations have the public interest at their heart. However, their operational context and perspective are different.

Firstly, my condolence to the families and friends of those who perished because of the Francis Scott Key Bridge accident[2]. The collapse victims and survivors had no way of knowing what was to happen on the night of the accident. I use the word “accident”. This was not an act of God, as some commentators would have it. The safety risks involved in the operation of the port in Baltimore could be anticipated.

In the US there’s an independent federal agency that is tasked with such major investigations. Interestingly, it’s the same one as that investigates aviation accidents and incidents. The National Transportation Safety Board (NTSB) is a multi-modal organisation. That is something we don’t have in the UK. Also, we don’t have a divide between federal and state organisations. Since in the UK we have separate independent national Air, Marine and Rail investigation agencies that cover the country (England, Scotland, Wales, and Northern Ireland).

I will not comment on the accident sequence or causes. It’s the job of an independent investigation to arrive at the technical facts. Recommendations will flow from that investigation.

Where a comment may be in order is that there are many locations across the globe where a vital piece of infrastructure, like a bridge being struck by a large container ship is a possibility. I’d generalise that further. When infrastructure that was designed a built 50 years ago meets modern day operational stress there’s going to be vulnerabilities. Yes, the aviation system is not immune from this fact too. It wasn’t so long ago when I read of PDP-11 computer hardware used for air traffic control (now, historic artifacts[3]). I’m sure there are still Boeing 747s, and alike that need floppy disks to update their hardware.

So, the wider subject is operational legacy systems working with modern systems. This is the interface that requires particular care. The safety risk appetite and exposure in the 1970s/80s was quite different from that which we expect upheld today.

Unfortunately, society is often reluctant to revisit this subject. Additionally, there’s the incentive to go for quick fixes and sweating assets. The example I have in mind the so-called “smart motorways” in the UK[4]. I don’t know how many fatalities can be linked to “smart motorways” but I’m sure, sadly, it’s too many.

POST: In time-off I enjoyed a trip out to Fort McHenry and a walk around the places where The Wire was filmed. The Fort McHenry story is interesting given its role in times of war. The British burnt the White House but the navy didn’t get past Fort McHenry in 1812.

[1] https://www.isasi.org/

[2] https://www.bbc.co.uk/news/av/world-us-canada-68661318

[3] https://www.tnmoc.org/air-traffic-control

[4] https://www.gov.uk/government/speeches/plans-for-new-smart-motorways-cancelled