Aircraft maintenance uses codes for processing
information. Some information, such as the aircraft
bureau number, is normally expressed in numerical
terms; thus, it does not need to be converted into codes.
In other cases. the information must be converted into
code so it can be machine processed.
Basic codes used on the VIDS/MAF are
prescribed for Navy-wide use. Therefore, they cannot
be changed at local option. Some of the codes are built
to provide some flexibility to allow expansion to meet
local needs. Some of the principal codes used by
aircraft maintenance activities are described below.
NOTE: A complete list of the codes can be found
in an appendix to OPNAVINST 4790.2.
Organization code. The organization code is a
three-character. alphanumeric code that identifies an
activity within a major command.
Permanent Unit Code (PUC). The PUC is a
six-character, numeric code assigned to each aircraft
reporting custodian for identification.
Work Center Code (WCC). The WCC is a
three-character, numeric code that is used to identify
work centers within an organization.
Type Equipment code (TEC). The TEC is a
four-character. alphabetic code that identifies the end
item of equipment on which work is performed, such
as aircraft, engine, or SE.
Julian date. The Julian date is a four-character,
numeric code used to show the date. The first character
of the code is the last digit of the year, and the last three
characters of the code show the day of the year. For
example. Julian date 6324 is the 324th day of 1996, or
November 19, 1996. When used on the VIDSMAF as
part of the JCN, the first position (showing the year)
is omitted. All dates used on source documents are
shown in Julian dates.
Job control number (JCN). The JCN is a 9-, 10-.
or 11 -character. alphanumeric code used to separately
identify each maintenance action. The JCN is made up
of four parts: the Organization code. the
three-character part of the Julian date that shows the
day of the year, a sequence number, and a JCN suffix.
The sequence number is either a three-character
number that runs sequentially from 001 to 999 or a
three-character, alphanumeric number with an
alphabetic first character and the last two numbers
running sequentially. from 00 to 99. Three-character.
sequence numbers are used to identify routine
day-to-day maintenance actions, such as
AC4-324-216. Three-character, alphanumeric
sequence numbers are used only to document major
inspections other than preflight, postflight,
turnaround, daily, special, conditional, corrosion, and
acceptance/transfer inspections. An example of this
type of JCN is AC4-324-A00.
The JCN suffix is an alphanumeric code that is
used by IMAs. It identifies a subassembly, or
subassembly repair action completed separately from
the major component repair action. This suffix is
added to the basic JCN to create the fourth part.
Work Unit Code (WUC). The WUC is a one-.
three-, five-, or seven-character numeric or
alphanumeric code. This code normally identifies the
system, subsystem, set, component. and part of the end
item being worked on. The first two characters identify
the system and are standardized.
Action Taken code. The Action Taken code is a
one-character, alphabetic or numeric code that
describes what maintenance was performed on an item
identified by a Work Unit Code.
Commercial and Government Entity (CAGE).
This is a five-position code assigned to manufacturers
and nonmanufacturers organizational entities and
contractors of items procured by agencies of the
Federal Government. This code is commonly called
the Manufacturers code.
Malfunction Description code. The Malfunction
Description code is a three-character, alphanumeric
code used to describe the malfunction occurring on or
in an end item. These codes are listed in both
alphabetical and numerical sequence in all Work Unit
Technical Directive code. The Technical
Directive (TD) code is a 12- or 13-character code used
to identify a specific TD by type number, revision,
amendment, part, and kit number. This code applies to
the VIDS/MAF when a TD compliance is
documented. The first two characters of Technical
Directive codes are listed in an appendix to
Technical Directive Status code. The Technical
Directive Status code is a one-character. alphabetic or
numeric code used to describe the type of work
accomplished. The type of work refers to scheduled
maintenance. unscheduled maintenance. and so forth.