IMC outside CAS

[Chilli Monster]

Originally Posted by IO540

Firstly, a radar service will be of NO help with hitting mountains, because the ATCO is not permitted to provide a service below a minimum vectoring altitude, and the MVA will generally be at, and often way above, the safety altitude for a wide area

Not strictly correct.

Yes, you cannot vector below MSA, which is normally based on the 4 cardinal quadrants, each one being based upon its dominant obstruction in that quadrant within 25nm of the airfield. Outside of 25nm MSA normally becomes highest obstruction within 100nm of the airfield

MVA however will be established for vectoring to the final approach track, and will be an area within 10nm of the airfield where descent below MSA is possible.

A look at a Radar Vectoring chart for most airfields will show the difference.