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Welcome to Mahir, this time we will be sharing about Airworthiness Directives. Colleagues who are involved in the aviation industry are likely familiar with AD, which stands for Airworthiness Directives. This document is issued by the authority and contains work orders. The authority referred to is the aviation authority in the respective country. The major authorities that serve as international references are the FAA and EASA. FAA stands for the Federal Aviation Administration, and EASA stands for the European Union Aviation Safety Agency. So, we will limit our discussion to these two authorities.
FAA (Federal Aviation Administration)
For the FAA, they use numbering as follows: FAA AAAA-BB-CC, for example, FAA 2013-06-03, which means it was issued in 2013 biweekly number 06, and 03 is the sequential number of the AD issued at that time. However, if a revision is issued, it will be added with R1, for example, becoming 2013-06-05R1.
EASA (European Union Aviation Safety Agency)
For EASA, they use numbering EASA AAAA-BBBB, for example, 2024-0076 means it was issued in 2024, and 0076 is the sequential number of the document issued in 2024.
Some of you may wonder what biweekly means. For ADs, the documents are issued biweekly. Biweekly is a two-week interval. For example, biweekly 2024-01 starts from January 1, 2024, to January 14, 2024, and continues until biweekly 26 of the current year, then resumes with biweekly 2025-01 in the following year.
ADs have two types based on compliance time, Emergency ADs and non-Emergency ADs. Emergency ADs have relatively short compliance times. In the FAA, they are indicated by the number 5, for example, FAA 2020-16-51, where the number five in the AD means it is an Emergency AD. For EASA Emergency ADs, they are indicated by adding the letter E, such as AD 2024-0067-E.
