When unscheduled maintenance is identified and the facility
does not have a manned dive in progress, then the required
maintenance will be treated as scheduled maintenance. T h e
maintenance action will be scheduled maintenance periodicity code
preceded by a "U" (i.e., US-2). Unscheduled maintenance identified
while the facility has a manned dive in progress is dependent upon
the HAZCAT of the equipment involved as previously discussed in
Section 3, paragraph 2, of this chapter.
Further guidance on
managing and conducting such maintenance is provided in the
paragraphs that follow.
Manned-Operations Failure Management Planning (FMP).
As previously discussed in Chapter 2, Section 6, failure management
planning (FMP) is required for HAZCAT II items.
requires the integration of the following:
Spare parts availability.
Further, failure management planning (FMP) involves:
Review of emergency procedures.
Establishment of approved maintenance procedures.
Review of spare parts availability & maintenance.
Personnel indoctrination & Training.
Manned-Operations Failure Management Maintenance
(FMM). FMM involves the actual implementation of the FMP. T h e
following steps outline the procedures for conducting FMM.
Step 1 in FMM is the initiation of the applicable
emergency procedure (s).
When the chamber occupants have been
isolated from the immediate danger, the secondary life-support
system is known to be functioning properly, and the situation is
firmly under control the unscheduled maintenance can be initiated.
b . Step 2 in FMM is the control of maintenance operations.
This involves strict liaison between the Dive Watch Supervisor and
the Maintenance Supervisor.
The Dive Watch Supervisor is
responsible for ensuring that the system is lined up so that
maintenance can be conducted, re-entry control initiated and tag-
out procedures followed. The Maintenance Supervisor is responsible
for providing the maintenance check-off sheets and ensuring that
the proper materials, tools and people are ready to conduct the
Prior to conducting the maintenance action the
Maintenance Supervisor must receive an approved REC sheet signed
by the Dive Watch Supervisor.