Specifications

MLSTD-1472E
5.9.9.2 Self-sup mflin~ covers Hinged access covers that are not completely removable shall
be self-supporting in the open position. The cover in the open position shall
not obstruct requid
visual or pltysicaJ access to the quipment being maintained or to dated equipment during
maintenance. Self-supporting covers should be capable of being opened and closed with one hand.
5.9.9.3 Labeling. Each access should be labeled with nomenclature for items visible or
accessible through i~ nomenclature for auxiliary quipment to be used with it, and recommended
procedures. Accesses shall be labeled with waxning signs, disclosing any hazards existing beyond the
access and prescribing precautions. Opening or removing an access cover shall not remove or visually
obstruct any hazard warning. If instructions applying to a covered item appear on a hinged door, the
lettering shall be oriented to be read when the door is open. Warning notices shall be clear, direct, and
attention-getting and have a 25 percent larger letter height than any detailed instructions that follow.
5.9.9.4 Rounding. Cover and access edges shall be rounded (See 5. 13.5.4) to preclude hand
injuty or clothing damage.
5.9.9.5 Ph~sical access.
5.9.9.5.1 Arm and hand access. Openings provided for access to interior quiprnent shall be
sized to permit the required adjustment or handling and shall provide an adquate view of the item
being manipulated. All blind arm and hand access shall mquhe approval of procuring activity.
5.9.9 .5.1.1
Ommht~ covers. Access covers shali be equipped with grasp areas or other means
for opening them. Covers shall accommodate handwear or special clothing that maybe worn by the
maintainer.
5.9.9.5.1.2 Reach access dimensionsand shaue.
The dimensionsof access openingsshall be
not less than those shown in Figure4S. Allowanceshall be made for the ckarance
of the operator’s
han~ applicablehandwear,andclothing. Accessshapeshallprovideclearance
for the quipment
(includingits protuberances,attachmentsand handles)that the maintainer
must replace through the
ol=~g, ~~ti bOdy p=t.s, and tools.
5.9.9 .5.1.3 Tool aceessdirnemu.ons. A=ss openingsshallbe large enough to operate tools
xe+ircd for maintenance of the quiprnent reached through the access.
5.9,9 .5.1.4 Guarding hazardous conditions. If a hazardous condition (such as exposed, high
voltage conductors) exists behind the access, the physical barrier over the access shall be equipped
with an interlock that will &-energize the hazardous equipment when the bamier is open or removed.
Botiti~n~ofW Mmdtititim ~-~W&~mtk~~m
case or cover such that it mnains visible when the access is open. Also see 5.9.9.3.
5.9.9.5.1.5 Type of opening.
Where
physical access is mqti, the following practices shall
be followed in order of prefemncc:
a. An opening with no cover unless this is likely to degrade system performance, safety, or
NBcContaminaion survivability.
b. A hand operated (latched, sliding, or hinged) cap or door where dirt, moisture, or other
tormgn rnamrmis m@t OtherWYseereatc a problem.
(’. A quick-opening cover plate using 1/4 turn captive fasteners if a cap will not meet stress
rc[ll]irclllcnl~ or ip;tc’c
prc~’cnts O hinged cm’cr