each airworthiness directive is issued with an associated six alphabetic character code.

each airworthiness directive is issued with an associated six alphabetic character code, as in this hypothetical case: AD 99-04-18 The first pair numbers represent the near in which issued. That plenteous is self-evident. But what about the other and third set of numbers? According to the Federal Aviation Administration (FAA), the secondary set of numbers indicates the biweekly period of the year in which the AD was issued. The third put of numbers represents the succession in which the AD was issued during the biweekly period. Thus, in our example, 99 depicts 1999, 04 represents the fourth biweekly period in 1999 and 18 signifies the 18th AD issued during the fourth biweekly period.

FAA headquarters, not the regions, from the way, assigns these numbers. Since they are controll and issued from a central location, we aweed if a simple five digit numbering digest might not be more understandable. For example, AD 00-035 could give an account of the 35th AD issued in the year 2000 Indeed, recommendations issued by way of the National Transportation Safety Board are identified in as it is a manner. Recommendations are identified at a letter code (P=Pipeline, M=Marine, I=Intermodal, etc) followed through the year issued and the succession number of the recommendation. For example, A-99-50 would signify the 50th recommendation issued in 1999 regarding aviation safety.

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