MIL-PRF-49192A(CR)
manufacturers on previous contracts. Recovered/recycled materials shall be used to the maximum
extent possible as long as they do not compromise the integrity of the equipment.
3.3.2 Components. The equipment shall not utilize externally accessible or externally
removable assemblies/subassemblies (e.g. mainframe plug-in concept). All major components,
assemblies, and subassemblies shall be identifiable by a part number placed in a discernible
location.
3.3.3 Controls. All controls which are required to operate the equipment throughout its
normal, specified performance characteristics, shall be located on the front panel. All controls,
switches, and indicators shall be clearly marked to identify their function and operation. Unless
otherwise specified in the contract or purchase order, built-in controls, adjustments and
compensating devices used to calibrate, test, and maintain the equipment shall not be externally
accessible.
3.3.4 Construction. The equipment shall be of solid-state, modular, miniaturized
construction. The equipment shall be designed and constructed to comply with all requirements
of performance, accuracy, and human engineering. The equipment shall provide adequate safety
factors, meet the requirements of being easy to install and maintain, provide high reliability under
varying operational environments, and conform to military service needs such as limited
maintenance under continuous use for long periods of time. The equipment shall be constructed
so that:
a. Subassemblies and chassis components can be removed without removing other hard
wired subassemblies, printed circuit cards or components. Encapsulation and embedment
(potting) of subassemblies shall not be used.
b. Calibration/adjustments can be made without removing components, printed circuit
cards, or subassemblies. The use of extender cards is permitted for calibration, troubleshooting,
or maintenance.
c. Printed circuit boards shall be designed to be removed without the need to unsolder
cables and interconnecting wiring. Connections to all printed circuit cards shall be through pin
and socket connectors. Printed circuit cards (mother boards) designed to distribute power and
signals to other printed circuit cards (daughter boards) are excluded from this requirement. When
mother boards of this type are used, they shall be accessible from both sides to allow for
maintenance testing.
d. Indicator lights, other than light emitting diodes (LEDs), shall be accessible and
replaceable from the operator's side of the front panel.
3.4 Electrical power sources and connections. The equipment shall operate from a
nominal 115/230 volts, single phase, 50, 60 and 400Hz source. An input power selector with a
provision to prevent accidental switching shall be provided.
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