Malfunction description code. A three- character numeric or alphanumeric code used to describe the malfunction occurring on or in an item. These codes are listed in both alphabetical and numerical sequence in all WUC manuals.

Support action code. A three-character numeric code used to identify routine, repetitive maintenance actions of a nonrepair type; for example, aircraft corrosion preventative measures such as aircraft washes.

System code. A two-character code used to identify the system within the aircraft or equipment on which work is performed. It is the first two characters of the WUC.

Technical directive code. A two-character numeric code that identifies the type of technical directive (TD). It is used as a part of the technical directive identification when a TD compliance is documented on a VIDS/MAF.

TD status code. A one-character alphabetic code used to indicate the status of a compliance with a technical directive.

TD identification code. A 12- or 13-character alphanumeric code used to identify a specific TD. Type maintenance (TM) code. A one- character alphabetic or numeric code used to describe the type of work that is accomplished. The type of work refers to scheduled maintenance, unscheduled maintenance, etc.

When discovered code. A one-character alphabetic code that identifies when the need for maintenance was discovered.

Position sensitive indicator (PSI). The position sensitive indicators are used to evaluate performance and/or logistics characteristics between identical components. These codes are identified in the WUC manual with a double asterisk (**). PSIs are made up of two groups as described below.

1. General position code. A two-digit alphanumeric code capable of indicating a location by use of plain language. For example, LH/RH indicates left-hand or right-hand installations such as main landing gear components, tires, side-by- side cockpit components, etc.; and FW/AF indicates fore and aft positions such as tandem cockpit components. UP/LW indicates upper or lower positions such as anticollision lights or antennas. PR/SC/AL indicates primary, secondary, or alternate positions such as hydraulic components or multiple avionics component installations. Numbers 01, 02, 03, 04, etc., indicate positions through the use of a sequential numbering system such as rotor dynamic components, or a numbering system used to identify the position of fuel nozzles on a gas turbine engine.

2. Specific position code. A two-digit alphanumeric code capable of indicating a specific location using alphanumeric sequencing to show the position.

Transaction code. A two-character numeric code denoting the type of data being reported and to indicate the record type (RECTYP) to be produced. Transaction codes are entered in block A32 of the VIDS/MAF.

Inventory status codes. Inventory status codes include the alphanumeric, one-position inventory status codes listed below. These codes are entered in block F21 of the VIDS/MAF. The inventory status codes denote the status of the aircraft and/or the equipment at the time of inventory; for example, gain, loss, or a change in material condition reporting status (MCRS). Inventory status codes for aircraft should coincide with the applicable OPNAV XRAY status reportable codes, according to the latest edition of OPNAVINST 5442.2. The inventory status codes are as follows:

0 - Inventory only. Equipment that is inventoried but no mission capability data is collected. These items will only be gained or lost and will require no change in MCRS reporting. This code is NOT to be used for aircraft reporting.

A - Fully operational. Aircraft or equipment in the inventory system that are in a fully operational status. For aircraft, it is those that are in status A series - B10-B80, BH0, BJ0, BK0, BL0 and BM0 - and, when undergoing depot repairs while in the physical custody of the operating activity, status codes H3A, HCA, H31, HC1, and G30 as defined in OPNAVINST 5442.2.

1 - Standard depot-level maintenance (SDLM). Those aircraft or equipment that are en route to, awaiting, or undergoing SDLM.