2Special work. AT THE DEPOT FACILITY.
Aircraft or equipment that are en route to,
or undergoing special rework
(modification, modernization, conversion, or
repair) in the physical custody of the depot repair
3Special rework at the reporting custodian
site. Aircraft undergoing depot special rework
consisting of modernization, modification, con-
versions, or incorporating depot-level technical
directives while in the physical custody of the
reporting custodian. Aircraft receiving depot
repairs while in the custody of the reporting
custodian remain in inventory code A.
4Other (decision to strike, remove from
service, bailment, loan, etc.). Those aircraft or
equipment that are affected by reasons other than
standard or special work.
Time/cycle prefix code. All entries in blocks
E42 through E52 and G38 through G48 of the
VIDS/MAF should be preceded by an alphabetic
code to indicate the source of information. For
example, A indicates aircraft time and is used to
report removal and/or installation of equipment
not having an hourmeter installed or an Aero-
nautical Equipment Service Record (AESR),
Module Service Record (MSR), Assembly Service
Record (ASR), Equipment History Record
(EHR), or Scheduled Removal Component (SRC)
card maintained. E indicates operating hours or
counts for items having an AESR such as engines
and propellers. M indicates meter time. All entries
in these blocks must be five digits. For example,
report 27 hours type-equipment time as A0027.
If the time exceeds 9,999 hours, the last four digits
are recorded; for example, 10,231 hours would
be recorded as A0231.
Awaiting maintenance (AWM) reason codes.
A one-digit numeric code used to indicate the
reasons why no maintenance is being performed.
Equipment operational capability (EOC) codes.
A three-character alphanumeric code that
identifies the degree of degradation to
capability and the system responsible
Up to this point, source documents have been
mentioned several times. This section introduces
you to the source documents used in the
Maintenance Data System (MDS). As an AZ, you
should understand the use of these source
documents in order to use the MDS effectively.
Most source documents originate and are
completed by the production work centers.
However, maintenance control personnel assist in
the preparation of some of them. Also, much data
entered in the logbooks is extracted from the
source documents. Therefore, you must have a
knowledge of the data they contain.
Source documents are the forms used to
record maintenance data. Since they furnish the
input information for the MDS, they must be
completed accurately. Collecting and reporting
maintenance data is more involved than any of
the other subsystems in the MDS.
The VIDS/MAF is used for recording mainte-
nance data. An explanation of the general use of
this source document is given in the following
NOTE: The VIDS/MAF is also known as the
VIDS register, which will be discussed later in this
VISUAL INFORMATION DISPLAY
The VIDS/MAF (OPNAV Form 4790/60) is
used to document maintenance actions and to
display those actions on a visual information
display (VIDS) board. The VIDS/MAF is used
to document on-equipment maintenance actions
(maintenance performed on complete end items).
It is also used to document the removal and
subsequent processing of a repairable component/
item to an IMA. Maintenance actions performed
on removed repairable components are considered
Copies 1, 3, 4, and 5 of the five-part form
contain the same information. Copy 2 contains
the necessary data for material reporting. Copy
3 is perforated along the fold line to make folding
the form easier when it is used as a register and
inserted on the maintenance or production control
VIDS board, or to permit removal of the top
portion of the form. The design of the form
permits folding the form to fit the VIDS board,
and it serves as the work center register. All copies
of the VIDS/MAF are separated by carbon,
permitting essential coded information to show
on succeeding copies. Each copy contains routing
identification in the upper left-hand corner as an
aid in copy recognition.