Appendix B. MAINTENANCE ALLOCATION CHART

TM 55-1730-226-13

MAINTENANCE ALLOCATION CHART

Section I. INTRODUCTION

Maintenance Allocation Chart.

B-1.

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

accordance with the Three Levels of Maintenance concept for army aircraft. These

m a i n t e n a n c e levels: Aviation Unit Maintenance (AVUM), Aviation Intermediate

Maintenance (AVIM) and Depot Maintenance are depicted on the MAC as:

AVUM which corresponds to the O code in the Repair Parts and Special Tools

L i s t (RPSTL).

AVIM which corresponds to the F code in the Repair Parts and Special Tools

L i s t (RPSTL).

DEPOT which corresponds to the D code in the Repair Parts and Special Tools

L i s t (RPSTL).

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

a s follows:

( 1 ) Aviation Unit Maintenance (AVUM). AVUM activities will be staffed and

equipped to perform high frequency "On-Equipment" m a i n t e n a n c e tasks required to

r e t a i n or return equipment to a serviceable condition. The maintenance capability

of the AVUM will be governed by the MAC and limited by the amount and complexity

o f support equipment, facilities required, a n d number of spaces and critical skills

a v a i l a b l e . The range and quantity of authorized space modules/components will be

c o n s i s t e n t with the mobility requirements dictated by the air mobility concept.

(Assignment of maintenance tasks to divisional company size aviation units will

c o n s i d e r 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 func-

t i o n s associated with sustaining a high level of equipment operational readiness.

P e r f o r m maintenance inspections and servicing to include daily, intermediate,

periodic and special inspections as authorized by the MAC or higher headquarters.

I d e n t i f y the cause of equipment/system malfunctions using applicable technical

m a n u a l troubleshooting instructions, Built-In-Test Equipment (BITE), installed

instruments, or easy to use Test Measurement and Diagnostic Equipment (TMDE).

Replace worn or damaged modules/components which do not require complex adjustments

or system alignment and which can be removed/installed with available skills,

tools and equipment. Perform operational and continuity checks and make minor

r e p a i r s . P e r f o r m servicing, functional adjustments, a n d minor repair/replacement.

Evacuate unserviceable modules/components and end items beyond the repair capa-

bility of AVUM to the supporting AVIM.

(b) Less than Company Size. Aviation Units. Aviation elements organic

t o brigade, group, battalion headquarters and detachment size units are normally

s m a l l and have less than ten aircraft assigned. Maintenance tasks performed by

t h e aircraft crew chief or assigned aircraft repairman will normally be limited