TM 10-1670-277-23&P
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SUPPORTING INFORMATION
28-FOOT DIAMETER CARGOR EXTRACTION PARACHUTE
MAINTENANCE ALLOCATION CHART (MAC)
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THIS WORKPACKAGE COVERS:
Introduction
Maintenance Functions
Explanation of Columns in the MAC
Explanation of Columns in Tool and Test Equipment Requirements
Explanation of Column in Remarks
INTRODUCTION
The Army Maintenance System MAC
This section provides a general explanation of all maintenance and repair functions authorized at various
maintenance levels under the standard Army Maintenance System concept.
The Maintenance Allocation Chart (MAC) designates overall authority and responsibility for the
performance of maintenance functions on the identified end item or component. The application of the
maintenance functions to the end item or component will be consistent with the capacities and capabilities
of the designated maintenance levels, which are shown in the MAC in column (4) as:
Unit – includes two sub-columns, C (operator/crew) and O (unit) maintenance
Direct Support – includes an F sub-column
General Support – includes an H sub-column
Depot – includes a sub-column
The tools and test equipment requirements (immediately following the MAC) list the tools and test
equipment (both special tools and common tool sets) required for each maintenance function as
referenced from the MAC.
The remarks (immediately following the tools and test equipment requirements) contain supplemental
instructions and explanatory notes for a particular maintenance function.
MAINTENANCE FUNCTIONS
Maintenance functions will be limited to, and defined, as follows:
Inspect. To determine the serviceability of an item by comparing its physical, mechanical, and/or electrical
characteristics with established standards through examination (e.g. by sight, sound, feel, etc.).
Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical
characteristics of an item and comparing those characteristics with prescribed standards.
Service. Operations, periodically required, to keep an item in proper operating condition, i.e., to clean
(includes decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants,
chemical fluids, or gases.
Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or by
setting the operating characteristics to specified parameters.
Align. To adjust specified variable elements of an item to bring about optimum or desired performance.
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.
