Increased helicopter operational requirements and the consequent advances in operating techniques are producing problems which need early recognition It is true that an increased requirement usually means an improvement in performance, but invariably each advance in performance introduces new handling problems In this short paper I will discuss two such handling problems as they effect the present military use of helicopters

Already the extension of pure helicopter flight for world-wide operation in any reasonable weathers and up to higher ceilings has provided new handling problems which we encounter regularly in our present work These I will discuss under the general headings of high altitude and instrument flight I am considering the problem of high altitude handling as a manufacturers problem, and instrument flight as a users problem