APPENDIX B. MAINTENANCE ALLOCATION CHART

TM 55-1730-224-13 & P

MAINTENANCE ALLOCATION CHART

Section I. INTRODUCTION

B-1. MAINTENANCE ALLOCATION CHART.

This Maintenance Allocation Chart (MAC) assigns maintenance

functions in accordance with the Three Levels of Maintenance concept

for army aircraft. These maintenance 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 List (RPSTL).

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

Special Tools List (RPSTL).

DEPOT which corresponds to the 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). AVUM activities will be

staffed and equipped to perform high frequency "On-Equipment"

maintenance tasks required to retain 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 of support

equipment, facilities required, and number of spaces 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. (Assignment 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

equipment operational readiness. Perform maintenance inspections and

servicing to include daily, intermediate, periodic 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 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