Strange metal hoses on Savannah S

Those metal flex tubes were a bad idea for more than one reason regardless of who installed them.

Those metal flex tubes were a bad idea for more than one reason regardless of who installed them. Mfg’s, after market Mfg’s do make bad decisions and fail to testing, research and physic’s to make better decisions.

I have same ones in my plane. They were mounted by the aircraft producer. They are used for connecting the coolant radiator only. There are just two pieces of them. I have no problem with coolant leaking neither the temperatures.

We have a strong Savannah community where I fly, at least 15 Aircraft. We do have some "mods" that make the Aircraft perform better, particularly in STOL mountain conditions....

Bigger wheels, Bigger and more robust front forks, Tail extension, Carb heat for winter conditions, better brakes, flap handle mod.. etc.

So far, no one has had issues with this type of coolant hose..perhaps we are just lucky. Yes it seems ugly and unnecessary but so far, no one has changed them

Ref corrugated metal hoses

Questions:

Are these hoses used throughout the fuel, oil & coolant reticulation systems?

What is their construction eg metal, "rubber" lined?

Do they conform with Rotax commendations?

Do you need to comply with the Rotax recommendation on 5 year replacement?

Availability? 

Are they limited to a few aircraft types eg Savannah?

What advantages/disadvantages do they confer?