Piper Attains Australian Approval For The M600 The M600 by Piper Aircraft is going to be sweeping the world very soon. The latest in a string of validations is from the Australian Civil Aviation Safety Authority (CASA). Owner operators of the nimble M600 will now be able to fly their M600 aircraft in and out of Australia. 6 persons can be seated in this turboprop aircraft and fly at a maximum speed of 274-knots. This is thanks to its 600 SHP Pratt & Whitney PT6A-42A turboprop engine. If you want an M600 it will cost you 2.853 million.