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 equip-
ment 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 alpha-
betic 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
1. General position code. A two-digit alpha-
numeric 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 com-
ponents, or a numbering system used to identify
the position of fuel nozzles on a gas turbine
2. Specific position code. A two-digit alpha-
numeric code capable of indicating a specific
location using alphanumeric sequencing to show
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
according to the latest edition of
OPNAVINST 5442.2. The inventory status codes
are as follows:
0Inventory 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.
AFully 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 seriesB10-B80, BH0, BJ0, BK0,
BL0 and BM0and, 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
1Standard depot-level maintenance (SDLM).
Those aircraft or equipment that are en route to,
awaiting, or undergoing SDLM.