used  to  identify  different  volumes,  parts,  and changes to specific TMs. For NAVAIR TMs, these numbers range from 00 through 99. In the example shown in figure 3-2, the TM serial number is 50. This stands for a Pilots Pocket Checklist. The third group of the TM identifier is the TM issue and is either a number (0 to 9) or a single letter. The number 0 indicates the TM is a basic issue  or  revision.  The  letters  A  through  Z (except  I  and  0)  designate  (in  alphabetical sequence)  permanent  changes  or  rapid  action changes (RACs). PI Suffix Composition The  PI  suffix  has  a  variable  composition, depending upon whether or not the TM has a security classification. For classified TMs, the PI suffix is always used, and the security classification indicator forms the first component of the suffix. The security classification  indicator  is  always  three  characters  (a letter enclosed in parentheses). The entire suffix can contain up to 17 characters, if required. In figure 3-2, you can see that the PI suffix is not required.   Therefore,   the   TMINS   number A1-F18AC-NFM-500 stands for the initial or revised edition of a Pilots Pocket Checklist supplement to the NATOPS  manual  of  an  F/A-18  aircraft.  In-depth information   can   be   found   in   the   OPNAV N0000-00-IDX-000/TMINS  publication. Q3. What are the two technical publication number- ing systems that are used within the Navy?. Q4.   What technical publication numbering system is patterned  after  the  13-digit  national  stock number? NAVAL AERONAUTIC PUBLICATIONS INDEX (NAPI) LEARNING  OBJECTIVE:  Identify  the sections of and describe the purpose of the Naval Aeronautic Publications Index (NAPI). All aeronautic publications, changes, technical directives (TDs), Navy departmental directives, and forms under the cognizance of NAVAIRSYSCOM and distributed  by  Naval  Air  Technical  Data  and Engineering   Service   Command   (NATEC)   are catalogued in the Naval Aeronautic Publications Index (NAPI).  Normally,  the  central  technical  publication library  (CTPL)  in  the  quality  assurance  division  should maintain a complete NAPI. The NAPI consists of six sections  to  make  identifying,  locating,  and  ordering specific  publications  easier.  The  six  sections  of  the NAPI are also critical in the management, audit, and verification of the CTPL. Each section contains its own introduction as to the purpose or function of the section and  the  specific  instructions  on  how  to  use  that particular index. The six sections that presently make up the NAPI are as follows: NAVSUP  PUB  2002,  Navy  Stock  List  of Publications, Forms, and Directives NAVAIR Technical Manuals and Technical Directives Distribution Listing NAVAIR  00-500A,  Equipment  Applicability List NAVAIR 00-500C, Directives Application List NAVAIR  00-500SE,  Support  Equipment Cross-Reference NAVAIR 01-700, Airborne Weapons Stores Publication Index NAVSUP PUB 2002 Distributed three times a year, the Navy Stock List of  Publications,  Forms,  and  Directives,  NAVSUP PUB 2002, is the primary index for requisitioning Navy publications,   forms,   technical   directives,   and departmental directives from the Defense Distribution Depot  Susquehanna  Pennsylvania  (DDSP).  The NAVSUP PUB 2002 is issued in compact disk read only memory (CD-ROM) format. Each new edition of NAVSUP PUB 2002 supersedes the previous edition. NAVAIR Technical Manuals and Technical Directives Distribution Listing The NAVAIR Technical Manuals and Technical Directives  Distribution  Listing  lists  all  NAVAIR publications  and  technical  directives  that  were distributed  by  the  automatic  distribution  system  during a specified time. This publication is also one of the primary tools that is used to conduct annual audits on the CTPL. This listing is issued quarterly. This publication has two sections. Section 1 lists NAVAIR  technical  manuals  and  section  2  lists NAVAIR   technical   directives.   This   publication identifies technical manual and technical directive number, type of issue, level of maintenance, title stock 3-6