attached to the AIR and one is retained by the shipping activity for the record. When an aircraft is delivered to a depot or contractor facility and is scheduled to be returned to the same organization after special depot level maintenance (SDLM), testing, or special projects, items not requiring rework or required by an activity for testing or special projects are retained by the current reporting activity. All removals should be appropriately noted on the OPNAV Form 4790/112 to relieve the depot or other activity of accountability requirements. The OPNAV Form 4790/104 is certified during the transfer action. When an aircraft is transferred via a depot or contractor program, the transferring activity ships only the minimum of essential AIR items noting all shortages on the OPNAV Form 4790/112. The remaining equipment is shipped to the receiving activity 30 days before the scheduled depot or contractor completion date. The OPNAV Form 4790/104 is certified during this transferring action. AIR Shortages When shortages of inventory items are re- vealed in preparing an aircraft for transfer, every effort should be made to locate the items or effect replacement before transfer. However, transfer of the aircraft must not be delayed pending replacement of the items. Before transfer, an OPNAV Form 4790/112 is prepared, listing all missing AIR- and MESM- related items. The original signed copy of this form is retained by the transferring activity as a permanent record of transfer. A second copy of the form remains in the AIR and is delivered to the accepting activity. A third copy of the form is forwarded to the aircraft controlling custodian/type commander (ACC/TYCOM) of the transferring activity. In case of an aircraft transfer between ACCs/TYCOMs, the third copy of the form is forwarded to the ACC/TYCOM of the accepting activity. A fourth copy is forwarded to the appropriate commander, fleet air (COMFAIR); the commanding general, Marine air wing (CGMAW); and the functional wing/commanding general, Marine brigade (CGMARBDE). For the AIR shortages to be related to any specific inventory or transfer transaction, the following mandatory entries are made on the OP- NAV Form 4790/112: . Name of transferring/receiving activity . Equipment check/certification number l Date . Signature of the inventorying activity’s commanding officer or representative authorized to sign by direction When shortages are discovered on receipt of an aircraft and are not properly recorded in the AIR, the receiving organization itemizes shortages and submits a list of such shortages within 10 working days after receipt of the air- craft to the organization from which the aircraft was received. The transferring organization takes the follow- ing action within 15 working days after receipt of shortage identification: . Furnishes vouchered turn-in documents or furnishes shipping data indicating shortages are en route. . If the transferring activity is unable to locate or justify missing items, an explanatory statement signed personally by the transferring activity’s commanding officer is forwarded to the accepting activity indicating the authority for shortages; for example, the report of survey. In all cases, authority for transferring aircraft with shortages must be obtained from the ACC/TYCOM before aircraft transfer. SUPPLY SUPPORT CENTER The SSC, also referred to as the aviation support division (ASD), is the single contact point where material control centers of O- and I-level maintenance activities place requirements for material and equipment required for support of weapons system maintenance. The SSC/ASD is composed of two sections, the supply response section (SRS) and the component control section 5-5