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An airworthiness directive (commonly abbreviated as AD) is a notification to owners and operators of certified aircraft that a known safety deficiency with a particular model of aircraft, engine, avionics or other system exists and must be corrected. [1] [2]
Some advisory circulars are only a few pages long and do little more than reference a recommended standard; for example, AC 20-152 referencing DO-254. [8] Others, like AC 20-115 C/D, are considerably longer; in this case including guidance on how to transition from DO-178 revision B to C [ 9 ] while AC 20-152A adds several new objectives to an ...
Processes are intended to support the objectives, according to the software level (A through D—Level E was outside the purview of DO-178B). Processes are described as abstract areas of work in DO-178B, and it is up to the planners of a real project to define and document the specifics of how a process will be carried out.
The airworthiness requirements for transport category (large civil aircraft, both airplanes and helicopters) are contained in Title 14, Code of Federal Regulations (14 CFR) part 25 (commonly referred to as part 25 of the Federal Aviation Regulations (FAR)).
All loops must have fixed bounds. This prevents runaway code. Avoid heap memory allocation. Restrict functions to a single printed page. Use a minimum of two runtime assertions per function. Restrict the scope of data to the smallest possible. Check the return value of all non-void functions, or cast to void to indicate the return value is useless.
An emergency airworthiness directive (EAD) is an airworthiness directive issued when unsafe conditions require immediate action by an aircraft owner or operator. An EAD is published by a responsible authority such as the FOCA, EASA or FAA related to airworthiness and maintenance of aircraft and aircraft parts. It contains measures which must be ...
Form 8110-3 is the only FAA form that any DER may sign under their designated authority. [14] Order 8110.37() provides instructions for completing Form 8110-3, and includes examples of completed Forms. The FAA also maintains an electronically fillable Form 8110-3 in its Document Library for download.
ARP4754(), Aerospace Recommended Practice (ARP) Guidelines for Development of Civil Aircraft and Systems, is a published standard from SAE International, dealing with the development processes which support certification of Aircraft systems, addressing "the complete aircraft development cycle, from systems requirements through systems verification."