Specifications

MIL-STD- 1472E
d, A
screw-downcover, when captive fasteners cannot be used beeause of stress, structure or
pressurization constraints. Use minimum number of interchangeable screws to fasten door,
5.9.9.6 Visual access. Where visual access is required, the opening shall provide a visua! angle
sufficient to view all required information at the normal operating or maintenance position. The
maintainer should be provided unrestricted visual aeeess from the workstation without bending.
Where bending is required, frequency and time in the bent
positionshallnot causefatigue. Where
visual acass only is required, the following practices shall be followed in order of precedence:
a.
b.
c.
d.
Opening with no cover except where this might degrade system performance or NBC
swwivability.
Transparent window if dirt, moisture, or other foreign materials might otimwise create a
problem.
Break-resistant glass window if physical wear, heat, or contact with solvents would
othenvise cause optical deterioration.
Quick-opening opaque cover if glass will not meet stress or
other requirements.
5.9.9.7 Whole bodY access. Where whole body access is required, the opening shall
accommodate 95% of projected maintenance personnel. Where rescue of pmsonnel may be required
because of environmental hazads (e.g., toxic fumes inside fuel tanks), access openings for two-
person ingress and egress shall be provided.
5.9.9.8 Aeeess cover ~
Covers shall be attached with the fewest number of simpkst-
to-operate fasteners practicable. Fasteners shall be operable by hand or by common hand tools in that
order of preference. Small, removable coven shall be attached to the structure or otherwise retained to
prevent 10ss.
5.9.10 Fasteners.
5.9.10.1 General The number and diversity of fasteners
used shallbe minimized
commensuratew~~s, bonding,pressurization,shieiding,thermal,and safetyrequirements.
Whenmore than one size or typefasteneris
used on the same equipment or cover, the fasteners-
equipment-cover interfaee shall permit the maintainer to readily distinguish the intended lmation of
each fastener. F@er or hand-operated fasteners shall be used when consistent with these
requirements, except where screws with heads flush with the case or timing surface are required for
NBC survivability. Faskmera requiring non-standard tools shall not be usrxl.
5.9.10.2 ~
--
Hinges, tongue-and-slot catches and mounting
pins shall be used t~ mi@ize the number of fasteners required; however, where covers are subject to
NBC survivability requirements, pin and hook arrangements, rakr than hinges, Shodd be
used.
5.9.10.3 Captive fasteners. Captive fasteners shall be used where dropping or losing such
items could
cause damage to e uipment or create a difficult or hazardous removal problem. Captive
3
fasteners shall also be provide for access covers requiting frequent removal.
5.9.10.1 Quanti~, If a hirycd wcrsc panrl w ql!ipk-opening fasteners will not meet ktres$,
. .. .—
pressurization, shielding, or safety requirements, the.m!nlmurn number consistent with these
rcqu]remcnts shall be used.
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