At last I have seen the SN3500 running during instalation testing. the display is vastly better than the old units to simulate bright sunlight a light sorce was placed to give the most reflection and I was in the right seat of the aircraft. This was the worst veiwing situation that we could set up in the hangar and under these conditions the old unit would have been imposable to see. I am pleased to say that the display was clearly visable and easy to read and in my opinion the quality of the display is almost up to the standard of the units fitted to the B737NG.
I think that Sandel have a real winner with the SN3500 and I am sure that it will be the benchmark that all the other avionic companys will have to judge HSI type products by.
I will be fitting an SN3500 as soon as is practicable as it is without doubt the best EHSI in this market sector.