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 Emergency Issue

standard Ad Process
The standard AD process is to issue a Notice of Proposed Rulemaking (NPRM), followed by
a Final Rule. After an unsafe condition is discovered, a proposed solution is published in the
Federal Register as an NPRM, which solicits public comment on the proposed action. After the comment period closes, the final rule is prepared, taking into account all substantive comments
received, with the rule perhaps being changed as warranted by the comments. The preamble to the Final Rule AD provides response to the substantive comments or states there were no comments received.
emergency Ad
In certain cases, the critical nature of an unsafe condition may warrant the immediate adoption
of a rule without prior notice and solicitation of comments. The intent of an Emergency AD
is to rapidly correct an urgent safety of flight situation. This is an exception to the standard process. If time by which the terminating action must be accomplished is too short to allow for public comment (that is, less than 60 days), then a finding of impracticability is justified for
the terminating action, and it can be issued as an immediately adopted rule. The immediately adopted rule will be published in the Federal Register with a request for comments. The Final Rule AD may be changed later if substantive comments are received.

superseded Ad
An AD is no longer in effect when it is superseded
　
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