FDAL - What does FDAL stand for? The Free Dictionary
References in periodicals archive
Other conflicting sources of DAL determination methods come from AC20-174, which, while it identifies the structured techniques of ARP4754A, it also provides in section 3 a caveat not just for "traditional techniques," but for FDAL and IDAL assignments in other ACs which are allowed to take precedence.
This identification of simple systems in the system safety process challenges the allocation of FDAL to systems which the ACs for 1309 classify as simple.