M A I N T E N A N C E ALLOCATION CHART
This Maintenance Allocation Chart (MAC) provides a summary of maintenance
operations for the Modem Unit MD-1149/MYQ-4A. This document assigns categories of
maintenance for specific maintenance functions on repairable items and identifies
tools and equipment required to perform each function. Each maintenance function
is assigned to the lowest level of maintenance prepared to perform that function.
It should be understood that each maintenance function can also be performed at all
higher levels of maintenance. The higher levels of maintenance will have tools and
test equipment to perform the maintenance functions assigned to and normally
performed by lower levels of maintenance.
B-2. MAINTENANCE FUNCTION DEFINITIONS.
Maintenance Functions are limited to and defined as follows:
Determination of the serviceability of an item by comparing its
a. I n s p e c t
physical, mechanical, and/or electrical characteristics with established standards
b. Test. Verification of serviceability and detection of beginning failure by
measuring the mechanical or electrical characteristics of an item and comparing
those characteristics with prescribed standards.
Performance of operations required periodically to keep an item in
proper operating condition. Such operations would include cleaning, preservation,
compressed air supplies.
d. Adjust. Maintenance within prescribed limits by bringing into proper or
exact position, or by setting the operating characteristics to the specified
Aline. Adjustment of specified variable elements of an item to the maximum
or desired performance.
f. Calibrate. Determination and cause corrections to or adjustments to
instruments or test measuring and diagnostic equipment used in precision
measurement. Consists of comparing two instruments, one a certified standard of
known accuracy, to detect and adjust any discrepancy in the accuracy of the
instrument being compared.
Install. Emplacement, seating, or fixing into position an item, part, or
module component or assembly) in a manner to allow proper functioning of the