On 28 February 2006, a Boeing 717-200 being operated by National Jet for Qantas Link on a domestic scheduled passenger flight from Paraburdoo to Perth, Western Australia in day IMC experienced an activation of the stall protection system just after the aircraft had levelled at a cruise altitude of FL340. The response of the flight crew was to initiate an immediate descent without either declaring an emergency or obtaining ATC clearance and, as a result, procedural separation against opposite direction traffic at FL320 was lost. The 72 occupants were uninjured and the aircraft was undamaged.