Date Time Unsecured insulation blanket results in pressurisation warning and emergency descent An insulation blanket likely not correctly installed during maintenance was partially ingested by an outflow valve in a Fokker 100 airliner’s pressurisation system, resulting in the crew donning oxygen masks and conducting an emergency descent. The Fokker 100 airliner, operated by Qantas subsidiary Network Aviation Services, was in the cruise at 26,000 feet on a scheduled passenger service for QantasLink from Perth to Geraldton on 10 August 2020 when the flight crew received an excessive cabin altitude warning. In response they donned their oxygen masks and commenced an emergency descent, and manually deployed oxygen masks for the passengers.