When a fan room door must be kept open to
supply air to a fan or to exhaust air from it, the
door should have the same classification as that
of the fan. For example, a fan room containing
a YOKE fan has a YOKE door; a room containing
YOKE and ZEBRA fans has a ZEBRA door. All
other fan room doors are classified XRAY.
A classification has no bearing on the security
of a space. A space classified ZEBRA may, for
security reasons, be locked during condition
YOKE if the space is unattended. However, the
locking must be reported to the DCA or to the
When material conditions of readiness are
being set, the ships first concern is the require-
ment for watertight, airtight, firetight, and
fumetight integrity. Living conditions and access
Condition YOKE may also be modified in a
similar manner when appropriate.
All ships are required to prepare and maintain
a DC closure log (fig. 7-6).
Strict discipline must be maintained in the
modification of a material condition of readiness.
As mentioned before, you must obtain permission
before you change a material condition setting in
any way. Obtain the permission from the DCA
or the OOD. During general quarters, repair party
officers control the opening and closing of all
fittings in the assigned areas. The repair party
officers must keep DCC informed so that the
ships DC closure log can be kept up-to-date.
The closure log is maintained at all times,
to spaces are secondary requirements. During long
whether the ship is in port or under way. The
periods at general quarters, however, condition
closure log is used to show the following:
ZEBRA may, with the commanding officers
permission, be relaxed to pass battle rations and
Where the existing material condition
to allow the crew to use the head facilities. The
readiness has been modified
opening of certain weather-deck doors permits
natural ventilation to replace the stuffiness at
The fittings type, number, and classifica-
some general quarters stat ions with fresh air.
Figure 7-6.-DC closure log.