Custodian codes are used to identify the control- ling custodian or Naval Air Systems Command Fleet Support (FS) activity that has control of an engine. Unit Identification Codes (UICs). Five-digit codes known as UICs identify reporting custodians. Activities that hold physical custody of engines are engine reporting custodians. UICs for reporting custodians are listed in Chapter 5, “Unit Identification Codes,” of the Navy Comptroller’s Manual, Volume 2, NAVSO P-1000-25, or can be obtained from the AEMS database. Status codes are two-digit numbers that describe the condition of an engine, the purpose for which an engine is being used, or the stage of progress that an unserviceable engine or serviceable engine has reached in the maintenance cycle. Status codes are shown in table 9-1. STAR codes are two-digit numeric codes that describe or give reasons for transactions, such as strikes, transfers, acquisitions, or removals of aircraft engines. Status and STAR code combinations reflect current engine status. A Status code is sometimes used without a STAR code, but a STAR code is never used without a Status code. A STAR code amplifies or qualifies the Status code. STAR codes are divided into the following five series: Status Code Series 11 13 21 22 23 24 31 32 33 36 37 and 38 40 41 46 and 47 48 49 90 Table 9-1.—Status Code Series and Their Categories Category Installed Engines/Propulsion Systems Installed Module Serviceable Uninstalled Ready For Issue (RFI) Spare Engines/Propulsion Systems/Modules Serviceable Uninstalled RFI Engines/Propulsion Systems/Modules (Fleet Activities Only) Serviceable Uninstalled RFI Engines/Propulsion Systems/Modules (Commercial, rework, Naval Aviation Depot [NADEP], Navy Supply Center [NSC]/Supply Office [SUPO], Aerospace Maintenance and Regeneration Center [AMARC]) Serviceable Uninstalled Non-RFI Engines/Propulsion Systems/Modules Unserviceable Engines/Propulsion Systems/Modules Unserviceable Engines/Propulsion Systems/Modules In Transit Uninstalled Unserviceable Engines/Propulsion Systems/Modules Unserviceable Engines/Propulsion Systems/Modules For Rework/Repair at a Naval Aviation Depot (NAVAVNDEPOT OR NADEP) or Commercial Repair Activity Engines/Propulsion Systems/Modules, Monetary Constraints or Awaiting Engineering Resolution Engines/Propulsion Systems/Modules, Strike Modular Propulsion Systems Engines/Propulsion Systems/Modules, Test Cell Correlation Engines/Propulsion Systems/Modules, Disposition and Excess Engines/Propulsion Systems/Modules, Bailed or Loaned Engines/Propulsion Systems/Modules, Naval Air Maintenance Training Group 9-2