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