The FCU

I decided to buy the FCU and EFIS ready built to save time as this is a complex unit and would have taken a lot of valuable hours. This was not without problems however.

The main difficulty was that the unit could not be used; whilst it is sold as a plug and play unit I could plug but not play as there was no interface software for AST. It was some months before this was developed by AST and even then the baro height adjustments did not work correctly and some of the buttons were scrambled. This was corrected some months later and it was 18 months before the unit was working nearly correctly. There remains an issue with the scrambling of baro digits on the pilot side which I gather is suffered by all other users.