FUNCTIONAL GROUPS

TM 55-1730-224-13 & P

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. ALIGN. To adjust specified vairable 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.

INSTALL. To set up for use in an operational environment such as

an emplacement, site or vehicle.

h. REPLACE. To replace unserviceable items with serviceable

assemblies, subassemblies or parts.

i. REPAIR. To restore an item to serviceable condition through

correction of a specific failure or unserviceable condition. This

includes, but is not limited to, inspection, cleaning, preserving,

adjusting, replacing, welding, riveting, and strengthening.

To restore an item to a completely serviceable

OVERHAUL.

condition as prescribed by maintenance serviceability standards

prepared and published for the specific item to be overhauled.

k. REBUILD.

To restore an item to a standard as nearly as possible

to the original or new condition in appearance, performance and life

This is accomplished through the maintenance technique of

expectancy.

complete disassembly of the item, inspection of all parts or

components, repair or replacement of worn or unserviceable elements

(items) using original manufacturing tolerances and specifications, and

subsequent reassembly of the item.

B-4.

FUNCTIONAL GROUPS. Standard functional groupings are not

considered feasible for aviation ground support equipment due to

variation and complexity. Therefore, variations to functional

groupings may occur.

B-5. MAINTENANCE CATEGORIES AND WORK TIMES.

The maintenance

categories (levels) AVUM, AVIM, and DEPOT are

listed on the Maintenance

Allocation Chart with individual columns that

indicate the work times

level. Work time

for maintenance functions at each maintenance

B-4