Are we even certain of the statement "as long as it is an aircraft instrument"? Volts, amps, and oil pressure are not changed when produced by an aircraft engine. Would this same reasoning then, allow us to install a Dynon or MGL glass cockpit if we wanted to? A Yes, if you can get a field approval 337. I have a mounted Garmin 696 with a field approval. --- In ercoupe-t...@ercoupe-techerc, Hartmut Beil <hb...@...> wrote: > > > Now, is there a ruling from the FAA that defines only TSO instruments in certified aircraft? > No. We had that discussion already. A. So what if we had brought it up before. Clear and accurate sources may not have been defined > > The exceptions are transponders. These are all TSO. >A. I cannot answer that question. I do not know all the avionics in the market place. > TSO'd parts are only required when defined by the manufacturer. > If you add another instrument, let's say a radar, you will have to get approval for that also, TSO'd or not. >A. that is absolutely correct. > Our Ercoupes were certified before TSO existed, so you can use whatever instrument, as long as it is an aircraft instrument. >A. Reasoning would tell you that is totally incorrect. Example: You have an old car (not an antique or show car for Pebble Beach) just an old car without directional signals - upon inspection you would not be permitted to drive it. Antique show Aircraft without radios have restrictions as well. Just because things were not needed yesterday we have to abide by the rulings of today. Of course they're are many exceptions to this. , Etc. , Etc. > > > Simple as that. >A. Not that simple. > > > It is a common misunderstanding of what TSO means and what it was made for that leads to this misperception. > > It is a common myth that TSO means better quality. >A. Yes a myth but has some merit. TSO (technical Standard Order) only means the manufacturer went one step further in the approval of the product. Takes money to do this. > > It does not. It means adherence to a standard. That s all. >A. No it means the item has been put through tests beyond what Non TSO requirements are. (Heat -Cold - shock -etc.) >
> Hartmut >A. YES > > >
