Q9. What part of the IPB contains information concerning detailed parts that make up a component? JOINT SERVICE UNIFORM SOURCE, MAINTENANCE, AND RECOVERABILITY (SM&R) CODES LEARNING OBJECTIVE: Identify where information can be obtained concerning national stock numbers (NSN), source of supply, and level of maintenance for aircraft components. A joint service uniform SM&R code is a five- or six-position alphanumeric code (callout 11 of fig. 3-4). These codes identify the source of spares and the levels of maintenance authorized to maintain, repair, overhaul, or dispose of all equipment. This information helps maintenance and supply personnel identify parts. Figure 3-5 shows a breakdown of an SM&R code. This SM&R code has four parts with six positions. In an SM&R code, the first position indicates the source from which you can acquire the item for replacement. The second position in the SM&R code identifies either the restrictions on acquiring the item or the level of maintenance required to manufacture or assemble the item. The third and fourth positions of the SM&R code identify maintenance-level codes. The third position indicates the lowest maintenance level authorized to remove, replace, and use the item. The fourth position indicates the lowest maintenance level authorized to perform complete repair of the item. The fifth position in the SM&R code indicates the recoverability code. This code tells maintenance and supply personnel the lowest level of maintenance authorized to condemn the item, if necessary. Figure 3-5.—Breakdown of a Source, Maintenance, and Recoverability (SM&R) code. A sixth position of the SM&R code is the Service Option code. Not all SM&R codes have six positions. This code’s sole use within the Navy is to further define certain conditions not covered by the Maintenance and Recoverability codes (third, fourth, or fifth positions). The SM&R codes are initially assigned during provisioning conferences, and they change to reflect actual fleet item usage. Detailed information concerning policies, procedures, definitions, and responsibilities applicable to SM&R codes is available in Navy Uniform Source,  Maintenance and Recoverability (SM&R) Codes, NAVSUPINST 4423.14, and in Policies, Procedures, Responsibilities For Assignment and Application of Uniform Source, Maintenance and Recoverability Codes, NAVAIRINST 4423.3. NAVSUP PUBLICATIONS The operation of your squadron or AIMD material control center is influenced by the Naval Supply Systems Command (NAVSUP). NAVSUP outlines the procedures that affect your material control center and supply department in manuals, publications, and directives. The NAVSUP publications that you will come in contact with are discussed in the following text. Master Cross-Reference List (MCRL). The MCRL comes in microfiche. It provides cross-reference information from a reference number (a manufacturer’s part number, a drawing number, or a design control number) to its NSN. Another edition of the MCRL cross-references from NSN to manufacturer’s part number. Master Repairable Item List (MRIL) (NAVSUP P-4107). The MRIL lists those items of Navy-managed repairable items issued on a one-for-one basis (you must turn in the unserviceable item before you can draw a replacement item from supply). AKs refer to these items as MTRs. If you need to know whether or not to remove a component before ordering it from supply, you should consult the Consolidated Remain In Place List (CRIPL). Consolidated Remain In Place List (CRIPL-01). At the O-level of maintenance, it is not always possible to remove a component from an aircraft until a replacement is on hand. If this is the case, you should refer to the CRIPL. The CRIPL lists the items that are exempt from the mandatory one-for-one turn-in. An example of an item listed in the CRIPL is the main 3-10