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 terminology and descriptors used in support of CS25-1309 analysis in the EASA Failure Condition Classifications and Probability Terms Introduction – Classifications Failure conditions may be classified according to the severity of their effects as follows: No safety effect: Failure conditions that would have no effect on safety. o For…

Sofema Aviation Services (SAS) www.sassofia.com takes a deep dive into the subject to understand the merits of an Effective Safety Survey process and the benefits for the organisation. Introduction EASA does not mandate a standard for an effective safety survey, this is left to the discretion of the organisation to develop. Unfortunately, this creates a challenge…