I flew Turkish Airlines from SIN to IST and the Turkish announcements were about 3 minutes long, whilst the following English announcements were about 10 seconds long.
Either Turkish is a complex language that can be translated to English with a minimal amount of English words, or TK only pay lip service to the English language, and believe that Turkish should be the worlds premier language, in the same way as the French believe that French should be the worlds premier language.
Every major engineering science and technology course has as its source, the English language. English is the language of engineering, science and technology, and it is always recommended that you have a very good grasp of the English language if you wish to make your way in any form of engineering, science and technology career.