Sofema Aviation Services (SAS) looks at using SWISS Cheese as a MEDA Model to support understanding of maintenance exposure. Complex systems defend against failure with multiple layers of protection (procedures, training, tooling, supervision, inspections, tests, etc.). Each layer has gaps (“holes”) due to design limits, local conditions, drift, or simple variability. Accidents happen when the…

Sofema Aviation Services (SAS) www.sassofia.com considers issues that have been reported by regulatory authorities related to the interface and functioning of an EASA Design Organisation Approval (DOA) and Production Organisation Approval (POA) relationship. Feedback from Competent Authority POA Oversight The following issues have been documented over a period of time to serve as an indicator…