Specifications

MILSTD-1472E
5.9.3.1 Knob adjustments Knobs rather than screwdriver controls shall be used whenever
adjustments occurring more often than once per month must be performed and where access, weight,
and related considerations permit their use.
5.9.3.2 Blind screwdriver ad@.ments. Screwdriver adjustments made without visual access
are permissible only if mechanical guides are provided to align the screwdriver. Screw travel shall be
limited to prevent the screw from falling out of its intended position.
5.9.3.3 Reference scale for adjustment controls. A scale or other appropriate reference shall be
provided for all adjustment controls. Rcfcmme scales shall be moldy visible to the person making the
adjustment. Mirrors or flashlights should not be nquired for adjustments.
5.9.3.4 Control limits. Calibration or adjustment controls which are intended to have a limited
degree of motion shall have mechanical stops sufficiently strong to prevent damage by a force or
torque 100 times greater than the resistance to movement within the range of adjustment,
5.9.3.5 Critical controls, Critical and sensitive adjustment controls shall incorporate features to
prevent inadvertent or accidental actuation. Operating any locking device used to prevent inadvertent
actuation shalJ not change the adjustment setting. Where the operator or maintainer is subjected to
disturbing vibrations or acceleration during the adjustment operation, suitable hand or arm support
shaUbe provided near the control to facilitate making the adjustment.
5.9.3.6 Hazardous locations. Adjustment controls should not be located close to dangerous
voltages, moving machinery, or any other hazards. If such location cannot be avoided, the controls
shall be appropriately shielded and labeled.
5.9.4 Accessibility.
5.9.4.1 Structural membexs. Structural mernbem or permanently installed equipment shall not
visually or physically obstntct adjustment, servicing, removal of replaceable equipment or other
n@red maintenance tasks. Panels, cases, and covers removed to access quipnnxtt shall have the
same access rqtiments as replaceable equiprneitt. Mounting provisions shall be directly visible and
physically accessible to the maintainers.
5.9.4.2 Lame items. Large items which are difficult to remove shall be so mounted that they
wi11not prevent convenient acxxss to other items.
5.9.4.3.
Use of tools and test equipment. Check points, adjustment points, test points, cables,
connectors, and labels shall be accessible and visible during maintenance. Sufficient space shall be
provided for the use of test equipment and other required tools without difficulty or hazard.
5.9.4.4 Rear access. Sliding, rotating, or hinged equipment to which rear access is required
shall be fnx to open or rotate their W distance and remain in the open position without being
supported by hand. Rear access shall also be provided to plug connectors for test points, soldering,
and pin removal where connectors require such operations. Aircraft instded equipment shall be
configured for one-sidd access.
5.9.4.5 Relative accessibility. Mission critical items which require rapid maintenance shall be
most acccssIblc. When mkmve crxtxcah~ ISnot a tactm, !tems requlnng most trequent access shaii he
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