TM 55-4920-402-13&P
serviceable/unserviceable material. Operates a can-
nibalization activity in accordance with AR 750-50. (The
aircraft maintenance company within the maintenance
battalion of a division will perform AVIM functions con-
sistent with air mobility requirements and conservation
of personnel and equipment resources. Additional in-
termediate maintenance support will be provided by the
supporting non-divisional AVIM unit).
B-2. Use of the Maintenance Allocation Chart.
a. The MAC assigns maintenance functions to the
lowest level of maintenance based on past experience
and the following considerations:
(1) Skills available.
(2) Time required.
(3) Tools and test equipment required and/or
available.
b. Only the lowest level of maintenance authorized to
perform a maintenance function is indicated. If the
lowest level of maintenance cannot perform all tasks of
any single maintenance function (e. g., test, repair), then
the higher maintenance level(s) that can accomplish an-
ditional tasks will also be indicated.
c. A maintenance function assigned to a maintenance
level will automatically be authorized to be performed at
any higher maintenance level.
d. A maintenance function that cannot be performed
at the assigned level of maintenance for any reason may
be evacuated to the next higher maintenance organiza-
tion. Higher maintenance levels will perform the
maintenance functions of lower maintenance levels
when required or directed by the appropriate com-
mander.
e. The assignment of a maintenance function will not
be construed as authorization to carry the associated
repair parts in stock. Authority to requisition, stock, or
otherwise secure necessary repair parts will be as
specified in the repair parts and special tools list appen-
dix.
f. Normally there will be no deviation from the as-
signed level of maintenance. In cases of operational
necessity,
maintenance functions
assigned
to a
maintenance level may, on a one-time basis and at the re-
quest of the lower maintenance level, be specifically
authorized by the maintenance officer of the level of
maintenance to which the function is assigned. The
special tools, equipment, etc. required by the lower level
of maintenance to perform this function will be fur-
nished by the maintenance level to which the function is
assigned. This transfer of a maintenance function to a
lower maintenance level does not relieve the higher
maintenance level of the responsibility of the function.
The higher level of maintenance has the authority to
determine:
(1) If the lower level is capable of performing the
work.
(2) If the lower level will require assistance or
technical supervision and on-site inspection.
(3) If the authorization will be granted.
q. Organizational through depot maintenance of the
US Army Electronics Command equipment will be per-
formed by designated US Army Electronics Command
personnel.
h. Changes to the MAC will be based on continuing
evaluation and analysis by responsible technical per-
sonnel and on reports received from field activities.
B-3. Definitions.
a. Inspect. To determine serviceability of an item by
comparing its physical,
mechanical and electrical
characteristics with established standards,
b. Test. To verify serviceability and detect incipient
failure by measuring the mechanical or electrical
characteristics
of an item
and comparing those
characteristics with prescribed standards,
c. Service. To clean, to preserve, to charge, and to add
fuel, lubricants, cooling agents and air.
d. Adjust. To rectify to the extent necessary to bring
into proper operating range,
e. Aline. To adjust specified variable elements of an
item to bring to optimum performance.
f. Calibrate. To determine the corrections to be made
in the readings of instruments or test equipment used in
precise measurement. Consists of the comparison of two
instruments, one of which is a certified standard of
known accuracy, to detect and adjust any discrepancy in
the accuracy of the instrument or test equipment being
compared with the certified standard.
g. Install. To set up for use in an operational
environment such as an emplacement, site or vehicle,
h. Replace. To replace unserviceable items with ser-
viceable assemblies, subassemblies or parts.
B-2
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