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CHAPTER 12
MAINTENANCE AND MATERIAL MANAGEMENT
SYSTEMS
The Standard Navy Maintenance and Material
Management Systems (3-M) was developed to meet the
need for a more effective means of recording, reporting,
and evaluating the maintenance requirements of the
fleet. In the past, most maintenance work was recorded
only in the shipboard logs. Although some reports were
required for failures of specified electronic equipment
systems and components, material commands had no
way of knowing if maintenance was being performed
on equipment under their cognizance. There was also
a lack of financial information. There was no effective
way of determining what part of the ship’s operating
target (OPTAR) was being spent for repair parts and
how much for consumable material.
These needs were partially met by using different
fund codes for the different classifications of material.
For example, Equipage, Repair parts, and
Consumables. Commands were then able to evaluate
OPTAR usage.
It was not until the advent of the
Maintenance Data System (MDS) that cognizant
commands could determine where maintenance
man-hours and materials were being used and thereby
evaluate the performance of equipment.
While 3-M and MDS are primarily the
responsibility of other departments supply does have a
definite part in making MDS work. This chapter
discusses the general concept of the shipboard 3-M
Systems and your responsibility in the overall
effectiveness of the program.
THE 3-M SYSTEMS
Each year, newly developed equipments requiring
highly specialized maintenance are installed aboard the
Navy’s ships. The maintenance requirements for an
electric motor or a circulating pump are relatively few
and simple. This is because of simplicity of design, a
small number of moving parts, and the fact that several
person may be qualified to perform the maintenance
work. This is not the case for automatic engineering
controls or the computers used for the control or missile
guidance systems. To perform properly, these control
systems must react immediately and accurately to
changing conditions. The 3-M systems endeavor to
substitute preventive maintenance for corrective
maintenance, thus reducing equipment malfunction and
downtime.
Proper evaluation of equipment cannot be based
only on planned exercises when all possible
preparations are made ahead of time. The 3-M systems
provide a means of continuously reporting maintenance
actions, equipment downtime, repair parts used, and the
maintenance personnel required to perform the work,
(Equipment downtime is the amount of time an
equipment is inoperable due to performance of
maintenance, lack of repair parts to fix it, or repair is
beyond the capability of ship’s personnel.) The 3-M
systems is not limited to complex systems. It is equally
applicable to, and effective for all types of shipboard
equipment.
The ship’s 3-M systems consist of the following
systems designed for maintenance management
PMS (Planned Maintenance System)
—Inactive Equipment Maintenance (IEM)
MDS (Maintenance Data System)
—AMS (Alteration Management System)
—IMMS (Intermediate Maintenance Activity
Maintenance Management System)
The scope of these systems of most importance to the
SK3 and SK2 is described in the following
subparagraphs.
PLANNED MAINTENANCE SYSTEM
The Planned Maintenance System (PMS) was
developed after extensive research on various types of
equipment to determine for each equipment all
maintenance actions required. This includes the
frequency of performance, procedures for performing
the maintenance, and the skill level (rate) required to
accomplish the work. Also the tools and materials
needed to do the job, normal time required, and safety
precautions to be observed. The system provides
planning and scheduling information to the
departments heads, division officers, and maintenance
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