Oleo
<<FWIW in the USA their is no hour requirement to become a flight instructor although you must have 15 hours in cat and class (and to teach in a twin you must have 5 hours on make & model)>>
And it causes problems! I spent a month in the States last year doing a CPL/IR MEL, and in that month, several "incidents" occurred on twins, because no one in the aircraft was really comfortable with what was happening. that included a Seneca ending up in approach lights at the far end of a 5000 Ft runway, with a bent prop for their pains!!!
I was lucky, I had more twin time than most of the instructors, and as a result ended up paired with one of the few instructors that really knew how to fly the aircraft, with the result that I did get what I went for.
Most of the instructors on the site would not have been able to do what I wanted, they hadn't had the experience to be comfortable with it.
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"Irish" Steve