FIELD MAINTENANCE INSTRUCTIONS
BRIDGE ERECTION BOAT (BEB)
MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION
THE ARMY MAINTENANCE SYSTEM (AMS)
This Work Package (WP) provides a general explanation of all maintenance and repair functions
authorized at two maintenance levels under Two-Level Maintenance System concept.
The Maintenance Allocation Chart (MAC) (WP 0170 00) designates overall authority and responsibility
for the performance of maintenance functions on the identified end item or component. The application
of maintenance to the end item or component shall be consistent with the capacities and capabilities of
the designated maintenance levels, which are shown on the MAC in column (4) as:
Field Level (Tactical)C (operator/crew), O (unit) maintenance, and F (Direct Support). Field
Maintenance is on-system maintenance and is mainly replacement of defective parts and
preventative maintenance. Field maintenance returns repaired equipment to operation.
It covers crew, unit, and selected DS maintenance tasks. Some "off-system" maintenance can be
done at field level, if based on task analysis, it is simple to complete or it is critical to mission
Sustainment Level (Sustainment)H (General Support) and D (Depot). Sustainment is off-
system maintenance and is mainly repair of defective or worn out equipment/parts. Sustainment
maintenance returns repaired equipment/parts to the supply system. It covers selected DS tasks,
GS and Depot maintenance.
The tools and test equipment requirements (immediately following the MAC) list the tools and test
equipment (both special tools and common tool sets) required for each maintenance function as
referenced from the MAC.
The remark (immediately following the tools and test equipment requirements) contains supplemental
instructions and explanatory notes for a particular maintenance function.