The Nepal civil aviation environment is one of the most challenging in the world due to its unforgiving mountainous terrain and sub-tropical weather system, combined with high altitude wind pattern and unpredictable cloud built-up. Also the high altitude airfields with extremely short runways have been designed for Pilatus PC-6 Porter aircraft and are now mostly used by DHC6 Twin-Otter, which require longer runways in order to provide the level of safety that is legally expected for public transport with commercial carriers using multi-engine aircraft.
One example is Dolpa: 457 meters of runway at 2'500 meters elevation with a 5 % slope
