Roll Steering with only a single GI275?

[Irmin]

Hello fellow Mooney-drivers! Help me out quickly: In order to eliminate the Vacuum system and also get Roll Steering with my trusted KFC-150, can I just use one GI275 instead of the original suction driven AI? I´ve seen installations with TWO GI275´s, one as AI and one as HSI, but could I just replace the AI as the HSI is electric anyhow? 

I have tried to use the search function, but no results. Maybe I am doing it wrong...

Thanks,

Irmin

[Irmin]

10 minutes ago, Irmin said:

Hello fellow Mooney-drivers! Help me out quickly: In order to eliminate the Vacuum system and also get Roll Steering with my trusted KFC-150, can I just use one GI275 instead of the original suction driven AI? I´ve seen installations with TWO GI275´s, one as AI and one as HSI, but could I just replace the AI as the HSI is electric anyhow? 

I have tried to use the search function, but no results. Maybe I am doing it wrong...

Thanks,

Irmin

I forgot: As a NAV-source I have already installed the GTN750Xi

[Irmin]

[Pinecone]

You need a back up AI.

With the dual GI-275 setup, the HSI one will auto revert to AI if the AI fails.

[Ragsf15e]

1 hour ago, Pinecone said:

You need a back up AI.

With the dual GI-275 setup, the HSI one will auto revert to AI if the AI fails.

I’m not saying it’s perfect, but does the stc allow just retaining the TC, alt , aspd vsi as the backup?  Im not so sure you need two…

[jlunseth]

1.  If you do that,  make sure you get the correct part number. I have a general recollection that there are different part numbers for a GI275 that can act as a primary AI, and one that is for backup.  

2.  When you buy the product and get the AFMS you are going to find out that the advertised backup battery time can be significantly shorter under some circumstances.

[Pinecone]

I am not sure what the STC will allow.