Overview
An airplane on an instrument landing system (ILS) approach encountered airframe icing, leading to a loss of control and subsequent collision with two houses. The pilot had been advised earlier of icing conditions in the area and delayed the descent to minimize exposure.
Sequence of Events
During the approach, some passengers observed ice accretion on the airframe. Shortly thereafter, the pilot reported that the airplane began to roll from left to right with a simultaneous loss of airspeed, even though the engine operated continuously throughout the event. The pilot was unable to maintain altitude, and the airplane descended below the clouds over a residential area. It subsequently struck two houses, coming to a stop upon impact with the second house.
Examination
An examination of the airplane did not disclose evidence of mechanical malfunction. The incident highlights the effects of airframe icing on aircraft performance and controllability during approach.