TM 55-1520-240-23-11
f.
Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or test,
measuring, and diagnostic equipment 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.
g.
Install. The act of emplacing, seating, or fixing into position an item, part, or module (component or assembly)
in a manner to allow the proper functioning of an equipment or system.
h.
Replace. The act of substituting a serviceable like type part, subassembly, or module (component or
assembly) for an unserviceable counterpart.
i.
Repair. the application of maintenance services or other maintenance actions to restore serviceability to an
item by correcting specific damage, fault, malfunction, or failure in a part, subassembly, module (component
or assembly), end item, or system.
j.
Overhaul. That maintenance effort (service/action) necessary to restore an item to a completely
serviceable/operational condition as prescribed by maintenance standards in appropriate technical
publications (i.e., DMWR). Overhaul is normally the highest degree of maintenance performed by the Army.
Overhaul does not normally return an item to like new condition.
k.
Rebuild. Consists of those services/actions necessary for the restoration of unserviceable equipment to a like
new condition in accordance with original manufacturing standards. Rebuild is the highest degree of materiel
maintenance applied to Army equipment. The rebuild operation includes the act of returning to zero those
age measurements (hours/miles. etc.) considered in classifying Army equipments/components.
B-4. STANDARD GROUPS (COLUMNS 1 AND 2).
The standard groupings shown in the sample below are used, as applicable, throughout this MAC. Maintenance
manuals and RPSTL will reflect these standard groupings as individual chapters, with sections in each chapter
relative to the individual complete systems, subsystems, modules, components, assemblies, or specific parts noted.
GROUP
NUMBER
DESCRIPTION
01
Aircraft General
02
Airframe System
03
Alighting Gear
04
Powerplant Installation
05
Blades/Rotor Systems
06
Train Systems
07
Hydraulic Systems
08
Instrument Systems
09
Electrical System
10
Fuel System
11
Flight Controls System
12
Utility System
13
Environmental Control System
14
Hoists and Winches
15
Auxiliary Powerplant System
16
Mission Equipment
17
Emergency Equipment
NO BREAK - WORK HARDER
NO BREAK - WORK HARDER
NO BREAK - WORK HARDER
1.
Ser vice - respect test, service adjus t, align c alibrate, or replace
2.
Actions - w elding, grinding, riveting, straightening, fac ing, remachining, or resurfacing
B-5