Yes, you can fly straight and level in the cruise without using the AI/AH but anything that requires manoeuvring with any accuracy needs the AI/AH.
That's amazing, been humping the Cyclic for 28years the last 11 in extreme Mountains & I never ever look at the AH/AI, not once
yet I gotta do some extreme manoeuvres in some pretty narrow gorges in weather? I was trained that my Airspeed indicator is my stick position (attitude) indicator & I look outside for everything else except, for speed & engine gauges. I never realised I needed an AH for all this flying
always learning but
