I have heard this “15 Hours” rumour before, and do not believe it to be correct.
Both JAR FCL 1 and Lasors 2006 clearly state that conversion from a JAA SE/IR to a JAA ME/IR may be achieved as follows
- hold a mutli-engine rating, or have completed the flight instruction for same
- undertake 5 hours ME(IR) training, up to 3 of which may be in an FNPT II
Now that’s a lot cheaper than the 15 hours you have quoted!
I think the 15 hour course refers to those wishing to convert from an ICAO ME/IR to a JAA ME/IR. It wouldn’t be that some schools are seeking to benefit from this misunderstanding, would it?