TM 55-4920-432-13&P
d.
Calibrate - To determine and cause corrections to be made or to be adjusted on instruments or test,
measuring, and diagnostic equipments used in precision measurement. Consists of comparisons
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 being compared.
e.
Test - To verify serviceability be measuring the mechanical, pneumatic, hydraulic, or electrical
characteristics of an item and comparing those characteristics with prescribed standards.
B-3. EXPLANATION OF COLUMNS IN THE MAC, SECTION II
a.
Column 1, Group Number - Column 1 lists functional group code numbers, the purpose of which is
to identify maintenance significant components, assemblies, subassemblies, and modules with the
next higher assembly. End item group number shall be "00".
b.
Column 2, Component/Assembly - Column 2 contains the names of components assemblies,
subassemblies, and modules for which maintenance is authorized.
c.
Column 3, Maintenance Function - Column 3 lists the functions to be performed on the item listed
in Column 2. (For detailed explanation of these functions, see paragraph B-2).
d.
Column 4, Maintenance Category -
(1)
AVUM - Aviation Unit Maintenance. AVUM activities will be staffed and equipped to perform
high frequency "On-Equipment" maintenance tasks required to retain or return equipment to
a serviceable condition.
(2)
AVIM - Aviation Intermediate Maintenance. AVIM provides mobile, responsive "one-stop",
maintenance support. Authorized maintenance includes replacement and repair of
modules/components and end items which can be accomplished efficiently with available
skills, tools, and equipment. AVIM inspects, troubleshoots, tests, diagnoses, repairs, adjusts,
calibrates, and aligns system modules and components.
B-2
