A Philippine Airlines jetliner carrying 303 passengers veered onto the grass from a taxiway today after making a landing at Hong Kong Airport, the government said. It said no one was injured. The Boeing 747 left the taxiway because of a mechanical problem, the government said in a statement. It did not elaborate. The plane landed at 3:08 p.m. after a flight from Manila. The jetliner later was towed away by airport workers, the government statement said. No other details were immediately available.