Aerial ignition of logging slash is becoming an increasingly common practice for site preparation and hazard reduction. Helicopter use for aerial ignition is especially valuable in inaccessible terrain. However, because documentation of site preparation resulting helicopter ignition is lacking, questions remain. Slash on two steep north slope clearcuts was broadcast burned with the aid of a helicopter in September 1980. The moisture content of lower duff and of slash less than 3 inches (7.6 cm) diameter was measured before the burn. The subsequent fires consumed 88 and 84 percent of slash less than 3 inches (7.6 cm) and resulted in 0 and 41 percent duff reduction. The fires reduced potential fire hazard and aerial portions of shrubs. The undesirable advanced regeneration was killed. However, the silvicultural goal of creating 40 to 60 percent bare mineral seedbed was not attained because of the high duff moisture. Study results found duff reduction and mineral soil exposure on the study area to be comparable to amount expected from earlier work, but the application over a wide range of moisture remains uncertain.