Sofema Aviation Services (SAS) www.sassofia.com considers Aviation Safety and Certification of Digital Systems and Safety Critical Software. Introduction Aircrafts are increasingly dependent on digital systems for everything from flight controls to in-flight entertainment. These systems need to be both safe and reliable. In this context, safety means that the system will not cause harm to people…

Sofema Aviation Services (SAS) ww.sassofia.com considers the requirements to ensure compliance with CS 25.1309 Note: The applicant should obtain early concurrence of the certification authority on the choice of an acceptable means of compliance. Introduction: Compliance with CS 25.1309(a) Equipment covered by CS 25.1309(a)(1) must be shown to function properly when installed. o The aeroplane operating…

Sofema Aviation Services (SAS) www.sassofia.com considers the certification basis of changed aeronautical product Introduction EASA has collaborated with the Federal Aviation Administration (FAA) and Transport Canada (TCCA) on the further improvement of the guidance on the implementation of the ‘Changed Product Rule’ (Part 21.A.101). With this rule, EASA establishes the type-certification basis for changes to Type…

Sofema Aviation Services (SAS) www.sassofia.com considers the Role & Purpose of ARP4754A Introduction ARP4754A serves to demonstrate with an adequate level of confidence that the project complies with the requirements defined by the reference CS and that errors in the design and implementation phases are identified and corrected so that the system meets the applicable Certification…