Partial power loss involving a Beech Aircraft Corp C23, VH-UMM, Coodardy Station, WA on 21 May 1993

The aircraft was engaged in sheep spotting operations when the engine began to run roughly, causing severe vibration. The pilot shut down the engine and carried out a forced landing on flat scrubby ground. The aircraft collided with shrubs during the landing. The reason for the rough engine running was not determined.