TEST BENCH INSTALLED.— These repairable are inventoried on the same basis as other DLRs, and custody is transferred to the relieving supply officer. Relieving Report Upon completion of the department material, personnel, and records inspection, the officers submit a joint relieving letter to the commanding officer. AIRCRAFT ENGINES The number of spare aircraft engines carried by the activities are determined by their type commanders. These engines are inventoried and managed by the type, model, and serial number. The reporting procedures for the Navy aircraft engine management system (AEMS) are prescribed in NAVAIRINST 13700.15. This instruction covers the requirements for reporting engine/propulsion system/module (EPSM). You should be familiar with the terms and definitions used in AEMS. Definitions l The AEMS on-line computer terminal is a computer terminal used for direct input of reports and retrieval of EPSM data. l The controlling custodians are air commands and Naval Air Systems Command (NAVAIRSYSCOM) fleet support units exercising administrative control of assignment, employment, and logistic support of certain aircraft and engines as specified by the Chief of Naval Operations (CNO). The controlling custodians are listed in NAVAIRINST 13700.15. .     The designated repair points (DRPs) include the naval aviation depots (NAVAVNDEPOTs), commercial repair facilities, and Army and Air Force facilities designated as NAVAIR fleet support custodians. l The EPSM reporting custodians are the Navy and Marine Corps activities, units, squadrons, and detachments (including commercial activities) that have physical custody of aircraft EPSMs. l  The engine transaction report (ETR) is submitted on an “as occurring” basis. l The term firewall refers to the section of an aircraft where the engine or propulsion system is installed. l The module is the first sectionalized portion of the propulsion system that is one level below the propulsion system, Some examples of modules are the power section, gear box, and so forth. . The term propulsion system serial numbers (PSSNs) is the same as the term engine serial numbers. The Naval Aviation Maintenance Office (NAVMAINTOFF) assigns the PSSN for modular propulsion systems. . Quick engine change assembly (QECA) is an engine or propulsion system to which a quick engine change kit (QECK) has been applied. This does not include the propeller for reciprocating engines or turbo prop propulsion systems. The QECA provides for rapid replacement of an inoperable engine in an aircraft. . A QECK is a kit containing all items required for a quick engine assembly change except for government-furnished equipment, engines, and propellers. l The status codes consist of two digits that describe the status of an aircraft EPSM. Refer to enclosure 2 of NAVAIRINST 13700.15 for a list of status codes. l Star codes consist of two digits that describe the condition or give the reason for transactions such as strikes, transfers, removals, and so forth. The star codes cannot be used without a status code. Refer to enclosure 2 of NAVAIRINST 13700.15 for a list of star codes. Reporting Responsibilities The controlling custodians are responsible for ensuring that the reporting activities submit the ETRs in a timely manner. The ETRs must be submitted no later than 2400 hours on the first working day following the date the status on EPSMs are assigned to their custody. The reporting responsibility starts when an EPSM has been received by a controlling custodian. The reporting responsibility stops when the EPSM is transferred to another controlling custodian or when the EPSM is stricken from AEMS. Supply officers (SUPOs) ashore and commanding officers of fleet and industrial supply centers (FISCs) are responsible for submitting transactions on EPSMs directly to AEMS. This includes EPSMs received in or transferred from their custody. Engines and propulsion systems removed from aircraft for organizational level maintenance or to 5-25