Talking about small aircraft here, assuming the pilot is stable and ready to land, they’re flying IFR and the visibility is nonexistent, but that’s alright because he’s currently IFR! But then the vacuum system fails. The pilot loses:

[![][1]][1] **Attitude Indicator** 

[![][2]][2] **Heading Indicator**

[![][3]][3] Turn Coordinator

With a very poor visibility I can see how this could end up fatal. What is the do’s and don’t here? I can easily see that with every scenario there can be an argument for both “do” and “don’t”. Pilot could go around, but at the same this may not be smart because you don’t know the pitch of the plane, at the same time I see it being okay because you know airspeed. 

I can also see a reason to continue on, to try and see if you can visualize the runway and land, seeing you know your altitude, at the same time I can see how that can be disastrous. So what’s the correct way to go about this type of failure in horrible conditions? 


  [1]: https://i.sstatic.net/tkY7Y.jpg
  [2]: https://i.sstatic.net/ZhaZX.jpg
  [3]: https://i.sstatic.net/rsW3A.jpg