I doubt a Chinook can cause anywhere near the damage a V22 does. Carrying an aid load of 300 to 600kgs the v22 only goes to airstrips & specially flagged giant fields now, as it's down-wash has blown the roof off many buildings & totally destroying others that survived the Earthquakes, hence being blocked by locals preventing them from landing, as the down force was far too destructive. In my humble opinion a v22 is not a machine suited to steep confined rugged mountainous terrain with ultra high DA like Nepal, with often tiny step landings, An Chinook B234 with good VR Pilot could do geat work bringing buiding materials to the same places.