used in conjunction with other publications, such as the MRIL and/or Hazardous Material Information Systems (HMIS). Items  are  listed  in  NIIN  sequence.  Each  microfiche is arranged, as shown below. Blanks indicate that a specific code is not applicable to the NSN. Cog—The   cognizance   code   assigned   to   the NSN. MCC—The material control code assigned to the NSN. FSC—The  Federal  supply  class  assigned  to  the item. NIIN—The  national  item  identification  number. SMIC—The   special   material   identification code. REP—The  repairable  material  code. SCC—The  security  classification  code. SL—The shelf-life code. SLA—The shelf-life action code. HZD—The hazardous material identification/ classification   code. In   addition   the   following   categories   of   items requiring  special  handling  are  contained  in  the  LIRSH: Repairable  Items-Refer  to  NAVSUP  P-4107, Master  Repairable  Item  List  (MRIL),  for  turn-in instructions. Shelf  Life—Items  determined  by  the  inventory manager to be deteriorative in nature. Physical   Security   Code   Item—refer   to OPNAVINST   5510.1C   for   special   handling instructions.  (other  than  unclassified  SCC  “U” items.) Hazardous Items-Refer to DOD 6050.5L and LR,   HMIS,   for   labeling   and   storage requirements. The codes and definitions for data printed in the LIRSH are listed in the NAVSUP P-4000. MASTER REPAIRABLE ITEM LIST (MRIL) The  MRIL  is  a  catalog  of  Navy-managed  repairable items.  The  primary  purpose  of  the  MRIL  is  to  provide fleet  activities  the  data  required  for  disposition  of  NRFI (Not  Ready  for  Issue)  repairables,  including  repair  level data, shipping data, or, when applicable, local disposal instructions.  In  addition,  other  selected  management data is provided. The MRIL is with the instructions listed below. When preparing repairable for retrograde shipment  for: SHIPS — follow    the    instructions    for documentation,   marking,   tagging   and transfer/shipment  found  in  NAVSUP  P-485. Guidance   for   protecting   and   packaging repairables  for  shipment  is  found  in  NAVSUP P-484. STRATEGIC  SYSTEMS  PROJECT  OFFICE COGNIZANCE   MATERIAL—This   includes Cognizance Codes 6A, 6H, 8H, 2P, 4P, 6P, 8P, 2X, 4X, 6X, and 8X. FLEET Ballistic Missile (FBM) activities will process FBM repairable in accordance with the FBM Master Repair List (MRL)   as   specified   in   SPCCINST   4423.39 series. These are the FBM Weapon System Repairable   Program   Requirements   and Procedures. Non-FBM activities should prepare invoices and ship these materials in accordance with  the  instructions  contained  in  the  MRIL. References  to  applicable  instructions  for  shore activities and foreign governments when preparing repairables for retrograde shipment are contained in the NAVSUP  P-4000. The MRIL is divided into two parts: Part  I—Listing  of  Items:  Contains  NSNs  and NICNs   of   repairable   items,   and   aircraft   engine type/mode/series   identifiers,   and   information   needed to make repair/turn-in determinations on repairable and aircraft engines. Items in this part are listed in the following sequence: (1) NICNs in NIIN sequence, (2) NSNs  in  NIIN  sequence,  and  (3)  engine  models  in alphanumeric  sequence.  (See  figure  4-7.) Part  II—Shipping  Addresses:  Contains  addresses of   designated   overhaul   points   (DOPs)   including contractors, and other indicated destination for all items listed in Part 1. Addressees are listed in shipping code sequence. (See figure 4-8.) How to Use the MRIL IF THE NATIONAL STOCK NUMBER IS NOT KNOWN.  Look  up  the  part  number/reference  number In the MCRL.If part number appears more than once, refer to CAGE (using Cataloging Handbook H4-2) to determine  the  manufacturer.  Once  the  right  part number has been found, the NIIN can be determined. Using   the   NIIN,   refer   to   Part   I   for   shipping instructions. 4-11