cancelled. A TD that is issued with no completion date should be removed from your active files after a cancellation amendment has been issued. A completed TD is retained (not discarded) as a permanent record of system  configuration  at  the  designated  compliance maintenance level. An unincorporated TD that is beyond  its  completion  date  does  not  relieve  the maintenance responsibility for compliance. Supersedure  is  the  administrative  process  by  which an issued TD is removed from active files. An interim TD is superseded by a formal change TD. A TD revision  supersedes  the  basic  TD,  including  all previously issued amendments and revisions. Cancellation  terminates  compliance  requirements and removes a TD from active files. A cancelled TD may be discarded. A TD cancellation is usually issued as  a  TD  amendment.  Cancellation  amendments  specify disposition of prior compliance. TECHNICAL DIRECTIVE NUMBERING SYSTEM The TD control center at NATEC assigns TD numbers  by  using  one  of  two  systems.  The  first numbering system is to number the TD sequentially by title; for example, Avionics Change (AVC) 3500, which would be the 3,500th avionics change. The second system is to number the TD sequentially by title within  a  specified  type/model  of  equipment;  for example, F-18 Airframe Change (AFC) 45, which would be the 45th airframe change to the F-18 airframe. Some of the most common technical directives in TD code sequence are listed in table 3-1. For a complete list, refer to NAVAIR 00-25-100, WP 009 00. TECHNICAL DIRECTIVE MANAGEMENT Upon receipt of a new TD, the CTPL librarian stamps the TD with the CTPL stamp and routes a copy of the TD to quality assurance (QA) for review of TD applicability. The CTPL librarian should ensure that the required TD and its revisions and amendments are routed to a quality assurance representative (QAR) for review. Next, the librarian delivers a copy of the TD, determined to be applicable by QA, along with a TD routing  and  tracking  sheet,  part  1,  (fig.  3-4)  to maintenance  control  for  action.  Maintenance  control completes part 1, item 3, of the tracking sheet and routes parts 1 and 2 to QA. Logs  and  records  will  add  the  TD  to  the NALCOMIS  TD  configuration  file  and  initiate  a maintenance action form (MAF) for each TD that QA determines to be required. Logs and records should also  annotate  the  incorporation  compliance  and  the event on the MAF; for example, incorporation no later than next phase or not later than next 10 flight hours. When compliance involves an aircraft, engine, or component, logs and records will annotate the current time plus the compliance time as the maximum time until the aircraft or item is restricted from flight. Logs and Records also orders the required TD parts or kits and ensures that the TD routing and tracking, part 2, (fig. 3-5) is signed or initialed by a QAR before the TD is logged in the appropriate logbook as not being appropriate. Logs and Records also adds the new TD to TDSA List No. 02 if the TD is an AFC or AFB. Table 3-1.—Technical Directives in TD Code Sequence TD Code TD  Title Abbreviation 01 Power  Plant  Bulletin PPB 02 Power Plant Change PPC 41 Commodity Software Bulletin CSB 40 Commodity Software Change CSC 50 Airframe Change AFC 54 Avionic  Change AVC 55 Avionic  Bulletin 74 Airframe Bulletin AVB AFB 3-10