APPENDIX B. MAINTENANCE ALLOCATION - TM-11-5820-670-120065

TM 11-5820-670-12

APPENDIX B

MAINTENANCE ALLOCATION

Section I INTRODUCTION

B-1.

MAINTENANCE ALLOCATION CHART.

a. This Maintenance Allocation Chart (MAC) assigns maintenance functions in accordance with

the Three Levels of Maintenance concept for Army Aviation. These maintenance levels (categories) -

Aviation Unit Maintenance (AVUM), Aviation Intermediate Maintenance (AVIM), and Depot

Maintenance are depicted on the MAC as:

AVUM, which corresponds to an O Code in the Repair Parts and Special Tools List (RPSTL);

AVIM, which corresponds to an F Code in the Repair Parts and Special Tools List (RPSTL); DEPOT,

which corresponds to a D Code in the Repair Parts and Special Tools List (RPSTL).

b. The maintenance to be performed below depot and in the field is described as follows:

(1) Aviation Unit Maintenance (AVUM) activities will be staffed and equipped to perform high

frequency on-aircraft maintenance tasks required to retain or return aircraft systems to a serviceable

condition. The maintenance capability of the AVUM will be governed by the Maintenance Allocation

Chart (MAC) and limited by the amount and complexity of ground support equipment (GSE), facilities

required, authorized manning strength, and critical skills available. The range and quantity of

authorized spare modules/components will be consistent with the mobility requirements dictated by

the air mobility concept. (Assignments of maintenance tasks to divisional company size aviation units

will consider the overall maintenance capability of the division, the requirement to conserve personnel

and equipment resources, and air mobility requirements.)

(a) Company Size Aviation Units: Perform those tasks which consist primarily of preventive

maintenance and maintenance repair and replacement functions associated with sustaining a high

level of aircraft operational readiness. Perform maintenance inspections and servicing to include

preflight, daily, intermediate, periodic (or phased), and special inspections as authorized by the

MAC or higher headquarters. Identify the cause of equipment/system malfunctions using applicable

technical manual troubleshooting instructions, built-in-test equipment (BITE), installed aircraft

instruments, or test, measurement, and diagnostic equipment (TM DE). Replace worn or damaged

modules/components that do not require complex adjustments or system alinement and which can be

removed/installed with available skills, tools, and ground support equipment. Perform operational

and continuity checks and make minor repairs to the electrical system. Inspect, service and make

operational, capacity, and pressure checks to hydraulic systems. Perform servicing, functional

adjustments, and minor repair/replacement to the flight control, propulsion, power train, and fuel

systems. Accomplish air frame repair that does not require extensive disassembly, jigging. or

alinement. The manufacture of air frame parts will be limited to those items which can be fabricated

with tools and equipment found in current air mobile tool and shop sets. Evacuate unserviceable

modules/components and end items beyond the repair capability of AVUM to the supporting AVIM.

(b) Less than Company Size Aviation Units. Aviation elements organic to brigade, group,

battalion headquarters, and detachment size units are normally small and have less than 10 aircraft

assigned. Maintenance tasks performed by these units will be those which can be accomplished by the

aircraft crew chief or assigned aircraft repair person and will normally be limited to preventive

maintenance, inspections, servicing, spot painting, stop drilling, application of nonstress patches,

minor adjustments, module/component fault diagnosis, and replacement of selected

modules/components. Repair functions will normally be accomplished by the supporting AVIM unit.

B-1