A 73-year-old Tigard woman was airlifted to a Portland hospital after a motorcycle accident on Washington Highway 142 about 14 miles west of Goldendale.  The accident occurred just before 3 p.m. Sunday afternoon.  According to the Washington State Patrol, the motorcycle being driven by Sharon Osborn Ryan was eastbound on Highway 142 when she tried to negotiate a right-hand curve.  The motorcycle crossed the centerline and the westbound lane and collided with the guardrail.  Osborn Ryan was wearing a helmet.  She was taken to Klickitat Valley Hospital in Goldendale, then airlifted to Emanuel Hospital in Portland.  Her condition was unavailable.