Güvenlik anonsunda can salından bahsedildi.

A natural breakdown is:

• güvenlik anonsu = safety announcement
• güvenlik anonsu-nda = in the safety announcement
• can salı = life raft
• can salı-ndan = about/from the life raft in form, but here specifically about the life raft
• bahsedildi = it was mentioned / there was mention

So the structure is basically:

• [Where?] güvenlik anonsunda = in the safety announcement
• [About what?] can salından = about the life raft
• [Verb] bahsedildi = it was mentioned

Very literally, it is something like:

In the safety announcement, mention was made of the life raft.

Right — these are not true possessives here.

In Turkish, many noun + noun combinations are formed with what is called an indefinite noun compound. In this pattern:

• the first noun stays plain
• the second noun takes a suffix that looks like the 3rd person possessive

So:

• güvenlik anonsu = safety announcement
• can salı = life raft

This does not mean:

• the safety’s announcement
• the life’s raft

It is just the normal Turkish way to build many compound nouns.

Compare:

• otobüs durağı = bus stop
• yemek masası = dining table
• spor salonu = gym

So anonsu and salı are just the standard compound forms.

The ending -da/-de is the locative case, meaning in / at / on.

But here the base is not just anons. The full noun is:

• güvenlik anonsu = safety announcement

Then you add the locative:

• güvenlik anonsu + nda → güvenlik anonsunda

The n appears because Turkish often inserts a buffer n when a case ending is added to a noun already carrying that compound/possessive-type ending.

So:

• anonsu = announcement (as the head of the compound)
• anonsunda = in the announcement

That is why anonsda would be wrong here: it ignores the compound form anonsu.

Because the verb bahsetmek requires the thing mentioned to be in the ablative case: -dan / -den / -tan / -ten.

So Turkish says:

• bir şeyden bahsetmek = to mention something / to talk about something

Examples:

• ondan bahsetti = he/she mentioned it / talked about it
• bu konudan bahsediyoruz = we are talking about this topic

In your sentence:

• can salı = life raft
• can salı-ndan = about the life raft

Again, the n is a buffer consonant because the noun already has that compound ending.

So this is not optional: with bahsetmek, you normally use -den.

Bahsedildi comes from bahsetmek = to mention / to talk about.

It breaks down like this:

• bahset- = verb stem
• -il- = passive marker
• -di = past tense

So:

• bahsedildi = it was mentioned / there was mention

This passive form is very common in Turkish when the speaker does not want to name a subject, or when the subject is unimportant.

So instead of saying:

• Görevli can salından bahsetti = The crew member mentioned the life raft

Turkish can simply say:

• Can salından bahsedildi = The life raft was mentioned / There was mention of the life raft

That sounds natural and neutral.

Because Turkish often uses the passive to make an impersonal statement.

English can do something similar:

• The life raft was mentioned.

We do not need to say who mentioned it.

Turkish does this very naturally with forms like:

• söylendi = it was said
• anlatıldı = it was explained
• bahsedildi = it was mentioned

So Güvenlik anonsunda can salından bahsedildi is a normal way to say that the safety announcement included mention of the life raft, without focusing on the speaker.

That is a very common English-speaker question.

Turkish does not have articles like a/an and the in the same way English does. So a noun like can salı can sometimes be translated as:

• a life raft
• the life raft
• just life raft(s) in a general sense

The correct English choice depends on context.

In this sentence, English will often prefer the life raft if a specific raft is meant in the announcement, or simply life rafts if the context is generic. But Turkish itself does not force that distinction here the way English does.

So the Turkish sentence is normal even though it does not directly mark a vs the.

The given order is very natural:

• Güvenlik anonsunda = sets the scene first
• can salından = gives the topic
• bahsedildi = verb at the end, which is standard in Turkish

Turkish word order is somewhat flexible, but changes in order can change focus or emphasis.

For example:

• Can salından güvenlik anonsunda bahsedildi
  = still understandable, but now can salından is brought forward for extra emphasis

The original version is probably the most neutral and natural for a textbook sentence.

So yes, word order can vary, but the version you have is the standard, unmarked one.

Here güvenlik is a noun, not an adjective.

• güvenlik = safety / security
• anons = announcement

Together:

• güvenlik anonsu = safety announcement

If Turkish wanted an adjective meaning safe, it would use something like güvenli.

So:

• güvenli = safe
• güvenlik = safety / security

That is why güvenlik anonsu means safety announcement, not safe announcement.