superseded Ad summary of Ads Compliance with Ads obtaining Ads Amateur-Built Aircraft 9-2 9 Plane Sense 14 CFR part 91, section 91.417, requires a record  to be maintained that shows the current status of  applicable ADs, including: An AD is no longer in effect when it is superseded by a new AD. The superseding AD identifies the AD  that is no longer in effect. There are no compliance  requirements for a superseded AD. For purposes of compliance, ADs may be divided into two categories: For ready reference, many aircraft owners keep a  chronological listing of the pertinent ADs in the back  of their aircraft and engine records. Generally, a  summary of ADs contains all the valid ADs previously  published.  Figure 9-1  is a sample form of summary  of ADs. ADs are the “final rule” and compliance is required  unless specific exemption is granted. Aircraft owners  are responsible for ensuring compliance with all  pertinent ADs. This includes those ADs that require  recurrent or continuing action. For example, an AD  may require a repetitive inspection each 50 hours of operation, meaning the particular inspection must be accomplished and recorded every 50 hours of time in service. m  CAUTION: Aircraft owners are reminded  that there is no provision to overfly the maximum  hour requirement of an AD unless it is specifically  written into the AD.  Both AD categories (small and large aircraft) are  published in biweekly supplements. All ADs are available on the FAA website at www.faa.gov. Advisory Circular (AC) 39-7 (as revised), Airworthi- ness Directives, provides additional guidance and  information for aircraft owners and operators about their responsibilities for complying and recording  ADs. For more information, contact the FAA  Regulatory Support Division, Delegation and  Airworthiness Programs Branch (AIR-140). AIR-140  contact information is available in the FAA Contact  Information appendix on pages A1–A2 of this  handbook. For help in determining if an AD applies to your  amateur-built aircraft, contact your local Flight  Standards District Office (FSDO). • Method of compliance; • AD number and revision date; • Date and time when due again, if recurring; • Certified mechanic’s signature; • Type of certificate; and • Certificate number of the repair station or  mechanical performing the work. • Those of an emergency nature requiring  immediate  compliance before further flight, or • Those of a less urgent nature requiring  compliance within a relatively longer period of  time.