complex conversion
 

Is conversion training to a complex single mandatory by an instuctor? or can the previous owner ,not an instructor, do it?

It needs an instructor, assuming that the new pilot does not already have the relevant differences training signed off.

If they already have the relevant differences training, and the insurance is fine with it - then any competent and qualified pilot can do it.

G

many thanks, theres nothing " signed off " in my licence, but i did my multi rating on an Aztec and flew everything up to B777, so do i still need an instructor sign off in a TB20?

Yes, if the "differences training" features of the TB20 - VP prop and retractable gear aren't entered in your logbook. Of course you also need a current SEP class rating.

Arguably a bit absurd if you covered everything in your MEP training. On the other hand why not just do it anyhow- time with a good instructor is seldom wasted.

G

If you held a multi rating on an Aztec then obviously you have completed training on retractable undercarriage and variable pitch propellers. You are not required to do further training ever. You do need to refer to your insurance policy in order to comply with their demands for the type.

I'm not keen on sellers giving conversion training because they tend to pass on bad habits and biases that may suit them and sometimes more likely influenced by bar talk prejudices. Over the years I've had to unravel too many problems for new owners because of this.

Any differences training must be signed off in a log book, but it's not type specific. An examiner would have signed off the MEP test in the log book, which would have covered wobbly prop and disappearing wheels for any type except one that needs a type rating.

Come on guys! It would have been valid on an Aztec for two years and then needed to be revalidated. If you wished to do the same on a Seminole or a Seneca then you would have needed the differences training on both of those as well. And it doesn't transfer to another Class i.e. SEP.
If you have a valid SEP and have flown VP prop and retractable on SEP in the past you are OK because it remains valid on SEP and TMG classes. FCL.710 Class and type ratings — variants

I didn't think difference training applied to TMG's. No sign off required for tailwhel etc

The table in FCL.700 certainly creates that impression however reading the text:
and I think the fact that because SEP and TMG are grouped together, they appear in this context even though there are no notified differences!

(b), a further differences training or a proficiency check in that variant shall be completed, except for types or variants within the SEP and TMG class ratings.

I don't read that to mean that that the differences training on MEPL is not valid for SEPL (or TMG) as you say. Read; "except for.......": i.e. the differences training on a MEPL is valid for SEPL but not valid on other MEPL.

Differences training is not valid across classes or types except for SEP/TMG.