At one time or another, I have consulted all of the following:
ICAO Doc 9859 (Safety Management Manual)
Federal Aviation Authority: Safety Management System Components
EUROCONTROL: ‘Just Culture – Finding the right balance between the aviation, judicial and political authorities’
Federal Aviation Authority: Accident & Incident Data
GOV.UK: Air Accident Investigation Branch Reports
UAE GCAA: Accident / Incident Investigation Reports
CAA-UK: SKYWISE – news and alerts
CAA-UK: YOUTUBE channel
SKYBRARY: aviation safety portal
