Otomatik eksternal defibrilatör eğitim maketiyle birlikte kullanılıyor.

Because it is built like this:

• kullan- = the verb stem, to use
• -ıl- = a passive marker
• -ıyor = present continuous / ongoing present

So kullanılıyor literally means something like is being used. In natural English, depending on context, it can also be translated as is used.

Turkish often uses -yor in places where English might choose either:

• is being used
• is used
• is currently used

So the exact English wording depends on context, but the Turkish form itself is very normal here.

Turkish uses the passive very often when the doer is unknown, unimportant, or simply not mentioned.

Here, the focus is on the equipment and how it is used, not on who is using it. That is why kullanılıyor is more natural than an active sentence.

A more active version would be something like:

• ... kullanıyorlar = they use / they are using ...

But in technical descriptions, manuals, labels, and instructional language, the passive is extremely common.

It breaks down like this:

• eğitim = training
• maket = model, mock-up, mannequin, dummy
• maketi = the compound form used in eğitim maketi
• -yle = with

So:

• eğitim maketi = training model / training mannequin
• eğitim maketiyle = with the training model / together with the training mannequin

The important thing for learners is that eğitim maketi is a noun compound, and that affects the form of maket.

Because this is not just maket + ile.

The phrase is eğitim maketi, which is a Turkish noun compound. In that compound, the second noun usually takes the compound ending -(s)i:

• eğitim maketi

Then ile is added:

• eğitim maketi + ile

When ile attaches to a word ending in a vowel, Turkish commonly uses a buffer y:

• maketi + ile → maketiyle

So maketiyle is the natural contracted form of maketi ile.

Yes, they overlap, but together they create a very common expression:

• X ile birlikte = together with X / along with X

So:

• eğitim maketiyle birlikte = together with the training model

Here is the difference in feeling:

• eğitim maketiyle = with the training model
• eğitim maketiyle birlikte = together with the training model, a bit more explicit or emphatic

You can often leave out birlikte, but including it sounds very natural and makes the sense of accompaniment clearer.

Because in this passive sentence, otomatik eksternal defibrilatör is not functioning like a normal definite direct object in an active sentence.

Compare:

• Active: Otomatik eksternal defibrilatörü ... kullanıyorlar.

  • Here defibrilatörü is the definite object.

• Passive: Otomatik eksternal defibrilatör ... kullanılıyor.

  • Here the thing being used becomes the main grammatical element of the sentence, so it appears without the accusative ending.

This is a very common pattern in Turkish passive sentences.

Not in the normal English sense of possession.

This is a noun compound, which is extremely common in Turkish. In these compounds:

• the first noun describes the second noun
• the second noun usually takes -(s)i

So:

• eğitim maketi does not mean that training owns the model
• it means a model for training or training model

This structure appears everywhere in Turkish:

• öğrenci kartı = student card
• telefon numarası = phone number
• yemek masası = dining table

So eğitim maketi follows the same pattern.

Because Turkish is normally a verb-final language.

A very common Turkish sentence pattern is:

• topic / subject
• other information
• verb at the end

So here:

• Otomatik eksternal defibrilatör = the main thing being talked about
• eğitim maketiyle birlikte = additional information
• kullanılıyor = verb, placed at the end

That final verb position is one of the most basic word-order features of Turkish.

Yes. Turkish word order is flexible, although the verb usually stays at the end.

For example, you could also say:

• Eğitim maketiyle birlikte otomatik eksternal defibrilatör kullanılıyor.

This is still grammatical. The difference is mostly about focus or what you want to highlight first.

The original version is perfectly natural if the main topic is the otomatik eksternal defibrilatör.

It is used in technical or specialized language, especially in medical contexts. It is basically an international/borrowed term.

In more everyday Turkish, you may also see words like:

• dış = outer, external
• harici = external

But in medical terminology, borrowed forms like eksternal are very common, so this sounds normal in a technical setting.