USE OF THE MAINTENANCE ALLOCATION CHART

TM 55-4920-405-13&P

be provided by the supporting non-divisional

B-3. DEFINITIONS.

AVIM unit).

a . Inspect. To determine serviceability of an

B-2. USE OF THE MAINTENANCE ALLOCATION

item by comparing its physical, mechanical and elec-

CHART .

trical characteristics with established standards.

a. The Maintenance Allocation Chart assigns

maintenance functions to the lowest level of main-

b. Test. To verify serviceability by measuring

tenance based on past experience and the following

the mechanical or electrical characteristics of an

consideration:

item and comparing those characteristics with

(1) Skills available.

prescribed standards.

(2) Time required.

C . Service. To clean, to preserve, to charge,

(3) Tools and test equipment required and/or

and to add fuel, lubricants, cooling agents and air.

available.

b. Only the lowest level of maintenance authorized

d. Adjust. To rectify to the extent necessary to

to perform a maintenance is indicated.

bring into proper operating range.

c. A maintenance function assigned to a mainte-

nance level will automatically be authorized to be

e. Align. To adjust specified variable elements of

performed at any higher maintenance level.

an item to bring to optimum performance.

d. A maintenance function that cannot be per-

formed at the assigned level of maintenance for any

f. Calibrate. To determine the corrections to be

reason may be evacuated to the next higher mainte-

made in the readings of instruments or test equip-

nance organization. Higher maintenance levels will

ment used in precise measurement. Consists of the

perform the maintenance functions of lower mainte-

comparison of two instruments, one of which is a

nance levels when required or directed by the a p -

certified standard of known accuracy, to detect and

p r o p r i a t e commander.

adjust any discrepancy in the accuracy of the instru-

ment or test equipment being compared with the

e . The assignment of a maintenance function will

certified

standard.

not be construed as authority to carry the associated

repair parts in stock. Authority to requisition,

g. Install. To set up for use in an operational

stock, or otherwise secure necessary repair parts

environment such as an emplacement, site or

will be as specified in the repair parts appendix.

vehicle.

f. Normally there will be no deviation from the

h. Replace. To replace unserviceable items with

assigned level of maintenance. In cases of opera-

serviceable assemblies, subassemblies or parts.

tional necessity, maintenance functions assigned to

a maintenance level may, on a one-time basis and at

i. Repair. To restore an item to serviceable

the request of the lower maintenance level, be spec-

condition through correction of a specific failure or

ifically authorized by the maintenance officer of the

unserviceable condition. This includes, but is not

level of maintenance to which the function is assigned.

limited to, inspection, cleaning, preserving, ad-

The special tools, equipment, etc. required by the

justing, replacing, welding, riveting, and

lower level of maintenance to perform this function

strengthening.

will be furnished by the maintenance level to which

the function is assigned. The transfer of a maintenance

J. Overhaul. To restore an item to a completely

function to a lower maintenance level does not relieve

serviceable condition as prescribed by maintenance

the higher maintenance level of the responsibility for

serviceability standards prepared and published for

the function. The higher level of maintenance has the

the specific item to be overhauled.

authority to determine:

(1) If the lower level is capable of performing the

k. Rebuild. To restore an item to a standard as

work.

nearly as possible to the original or new condition

in appearance, performance, and life expectancy.

(2) If the lower level will require assistance or

This is accomplished through the maintenance

technical supervision and on-site inspection.

technique of complete disassembly of the item, in-

spection of all parts or components; repair or re-

(3) If the authorization will be granted.

placement of worn or unserviceable elements (items)

using original manufacturing tolerances and specifi-

cations, and subsequent reassembly of the item.

g. Organizational through depot maintenance of the

U.S. Army Electronics Command equipment will be

performed by designated U.S. Army Electronics

B-4. FUNCTIONAL GROUPS.

Command personnel.

Standard functional groupings are not considered

h. Changes to the Maintenance Allocation Chart

feasible for aviation ground support equipment due to

will be based on continuing evaluation and analysis

variation and complexity. Therefore; variations to

by responsible technical personnel and on reports

functional groupings may occur.

received from field activities.

Change 3

B-2