delineated by OPNAVINST 4790.4A. PMS is an established scheduled
maintenance program which provides detailed maintenance procedures
and periodicity of performance for many of the equipments,
components and systems that are found in shore-based hyperbaric
is maintenance which is necessitated by equipment, component or
system failure or degradation below acceptable standards/criteria.
Unscheduled maintenance is, therefore, corrective in nature.
For man-rated hyperbaric facilities it is required that all
equipments, components and systems be analyzed and their hazard
category (HAZCAT) identified, per the guidance in Chapter 2,
Section 6, prior to the conduct of manned operations. This HAZCAT
the planning and provisioning of
Items identified as HAZCAT I do not
require provisions for unscheduled maintenance since their failure
would be, by definition, not repairable without aborting the dive.
HAZCAT II items, those for which failure would endanger the lives
of the occupants/divers, are repairable.
HAZCAT II items shall
have maintenance procedures available to initiate immediate repairs
including the availability of spare parts.
HAZCAT III items are
those which do not endanger the lives of the occupants/divers but
repair in order to continue the dive.
HAZCAT III items require
available maintenance procedures including the availability of
spare parts, should the command desire to continue the dive
profile. Although the maintenance procedures for HAZCAT II and
HAZCAT III items may be the same as those used for scheduled
maintenance of the same items, the difference is that spare parts
must be physically located at the hyperbaric facility which are
ready for installation and readily accessible.
The primary objective of unscheduled maintenance for man- rate
hyperbaric facilities is to provide for maintenance management and
support in a manner which will ensure maximum safety of the
operation of the facility.
Therefore, unscheduled maintenance will be established to meet the
following intermediate objectives:
Identification of the HAZCAT for all systems, equipments
Failure management planning for correction of HAZCAT II
items (HAZCAT III items at command option).
Spare parts provisioning for all HAZCAT II items (HAZCAT
III items at command option).
Scheduled maintenance performance on all spare parts for
HAZCAT II items (HAZCAT III items at command option).