A deadline designed an aeroplane. Pilots were never told about the system that could push the nose down. 346 people died.
Harder version: read this lesson at C1 level →
Look at each word. Say what you think it means. Then tap the card.
Tap a card to see the meaning.
Write one word from the cards in each gap.
1. We have a of Friday to finish the report.
2. The new staff get three weeks of before they start.
3. The light on the dashboard is a that the engine is too hot.
4. The company has a very open — anybody can talk to the director.
5. If you see something dangerous, please .
6. The plane could not fly because of a in the engine.
1. deadline · 2. training · 3. warning · 4. culture · 5. speak up · 6. fault
Read each part. Then answer the questions before you read the next part.
In 2011 Boeing had a serious problem. Airbus had put new, much more efficient engines on its A320, and airlines were ordering them fast. Boeing was about to lose one of its biggest customers.
Boeing had been discussing a completely new aircraft. That would take ten years. Instead, in a few weeks, it decided something else: it would put the new engines on the 737 — a design first approved in 1967.
The new plane was called the 737 MAX. It could be approved faster and built on the existing production lines.
And it came with a promise that airlines loved: your pilots already fly the 737, so they will need almost no extra training. One big customer's contract reportedly said Boeing would pay money for every aircraft if simulator training turned out to be necessary.
But there was a physical problem. The old aircraft sits low to the ground, and the new engines were too big for the old position. So they were moved forward and up.
That changed how the aircraft flew. In some situations the nose wanted to lift up more than before.
Boeing could have changed the aircraft's body. Or it could have accepted that the plane flew differently — but that would mean training, and training was the thing the whole plan existed to avoid.
So engineers added software instead. It was called MCAS. When a sensor said the nose was too high, MCAS pushed the nose down automatically.
In its final form, MCAS could act again and again, with strong control of the aircraft, listening to one single sensor.
And because the whole idea was that this plane was the same as the old one, MCAS was left out of the pilots' manuals and out of the training.
Most pilots flying the 737 MAX did not know that it existed.
True or false? Click your answer.
1. Boeing decided to design a completely new aircraft.
2. The promise of very little pilot training was commercially important.
3. Pilots were carefully trained to use MCAS.
There is one more piece. Aircraft safety is checked by the regulator — but under a system where the regulator allows the manufacturer's own employees to do much of the detailed work for it.
Later investigations found that the regulator's paperwork never caught up with what MCAS had become. The safety analysis on file described an earlier, weaker version of the system than the one that actually flew.
On 29 October 2018, Lion Air flight 610 took off from Jakarta. One sensor was faulty, and it was feeding MCAS.
The system pushed the nose down, again and again. The crew were fighting a system they had never been told about. Thirteen minutes after take-off, the aircraft went into the sea. All 189 people on board died.
Only after this did Boeing publish a bulletin that effectively told the world's pilots that MCAS existed — while saying that the normal emergency procedures were enough.
The aircraft kept flying. A software fix was promised for later.
On 10 March 2019, Ethiopian Airlines flight 302 crashed shortly after take-off from Addis Ababa. All 157 people on board died.
This time the world did not wait. Countries began to ground the aircraft one after another. Within days every 737 MAX on earth was on the ground, and it stayed there for twenty months.
True or false? Click your answer.
1. The safety documents described the same system that actually flew.
2. After the first crash, the aircraft continued flying.
3. The aircraft was grounded for about twenty months.
Boeing paid about 2.5 billion dollars in an agreement with the American government over misleading the regulator's training group.
But the deeper investigations went back much further — to 1997.
Boeing had always been an engineers' company, run by people who had built aircraft. In 1997 it took over McDonnell Douglas. According to many people inside, the other company's finance-first culture won the argument.
The head office moved away from the factories. Shareholder returns became the scoreboard. Work was sent out to many suppliers, so engineering knowledge broke into pieces.
And slowly, over twenty years, the person who was allowed to say "not yet" to a schedule lost their authority.
On this reading, the 737 MAX was not an accident. It was an arrival — the moment when a long cultural change finally met physics.
The aircraft returned in late 2020 with MCAS rebuilt: two sensors instead of one, much less power, and full documentation. It also came with simulator training — the exact thing the original design existed to avoid.
Boeing said the lessons had been learned.
Then in January 2024, a door panel blew off a nearly new 737 MAX 9 in flight. By luck, nobody was seriously hurt. Investigators found the panel had left the factory without its bolts.
This was a different kind of failure — building quality, not design — but it destroyed the recovery story. The chief executive announced he was leaving. The regulator limited production. A new chief executive was brought in from outside, with a simple message: move the leadership back to the factory floor, and give the engineers their voice back.
The question this case leaves is not comfortable, and every organisation has its own version of it.
When your deadline and your engineers disagree — who is required to win?
True or false? Click your answer.
1. Investigators traced the problem back to a company merger in 1997.
2. When the aircraft returned, MCAS used two sensors instead of one.
3. The 2024 door panel problem was caused by the MCAS software.
This story is about rules, duties and things that people failed to do. English separates these carefully, and the differences matter here.
must / have to = it is necessary. → "Pilots must know what the system does."
should = it is a good idea, or the right thing. → "Boeing should have grounded the aircraft."
The dangerous one: mustn't and don't have to are opposites, not the same. You mustn't fly = it is forbidden. You don't have to fly = it is not necessary, but you can.
Talking about the past: should have + past participle = the right thing, which did not happen. → "They should have told the pilots." This is the structure this whole case needs.
| Structure | Meaning | Example |
|---|---|---|
| must / have to | necessary | Pilots have to be trained. |
| mustn't | forbidden | You mustn't fly without training. |
| don't have to | not necessary | Boeing said pilots didn't have to retrain. |
| should | a good idea | They should tell the pilots. |
| should have + past participle | the right thing, but it did not happen | They should have grounded the fleet. |
Write must, had to, didn't have to, should or should have.
1. Boeing promised that pilots do expensive simulator training.
2. The pilots have been told that MCAS existed.
3. After the first crash, the company have grounded the aircraft.
4. A safety system never depend on a single sensor.
5. Airlines stop flying the aircraft in March 2019.
1. didn't have to · 2. should · 3. should · 4. must · 5. had to
Each sentence has one mistake. Say the correct sentence out loud, then check.
1. They should told the pilots about the system.
2. You mustn't do the training — it is not necessary.
3. Boeing must to change the design.
4. The pilots should have knew about MCAS.
5. Every airline had ground the aircraft in March.
1. They should have told the pilots about the system. (should have + past participle)
2. You don't have to do the training — it is not necessary. (mustn't means forbidden)
3. Boeing must change the design. (no to after must)
4. The pilots should have known about MCAS. (past participle, not past simple)
5. Every airline had to ground the aircraft in March. (have to + verb)
Take your time. Short sentences are fine.
Tell me what happened with the 737 MAX. Six or seven sentences is enough.
Has anyone ever told you that something was not ready, when you needed it finished?
What did you do? What should you have done?
In your workplace, who can stop a project? Is it really possible, or only in theory?
Give an example if you can.
The problem was traced back to a merger twenty years earlier.
Do you accept that explanation, or is it a way of blaming nobody?