MIL-HDBK-1908B
Connector acq. A piece of hardware that joins or attaches lines or cables to other lines or cables or to items of equipment. The term is used rather loosely to refer to either of two parts that mate with each other or to the plug that mates with a receptacle.
Contrast gen. See "Luminance contrast."
Control gen. A mechanism used to regulate or guide the operation of a machine, equipment component, subsystem, or system.
Control entry uci. User input of data for computer processing/sequence control (e.g., function key actuation, menu selection, command entry) whereby the character or symbol and a control key are jointly activated, requiring computer responses to such inputs.
Control mode uci. The condition of the keyboard when the control (CTL) is depressed. In this mode the alpha keys, which are also labeled with a control character, generate that associated control character.
Controller uci. Any device used to position the cursor on the computer monitor screen. (Examples are: mouse, joystick, cursor keys, light pen, touch screen, track ball.)
Cover acq. An item of equipment that closes an access opening.
Critical display gen. A display required for mission success.
Critical fusion frequency (CFF) gen. The threshold frequency of a flickering light stimulus at which the light is reported to be constantly on (i.e., no flicker is discernible).
Critical task acq. A task requiring human performance which, if not accomplished in accordance with system requirements, will most likely have adverse effects on cost, system reliability, efficiency, effectiveness, or safety. Critical performance is usually part of a single line or flow in the operation or maintenance cycle of the system. An example of a single line of flow involving human performance is the transmission of a message which must be passed for operations or maintenance cycles to commence or to continue, such as an order to prepare a missile for launching. If this order is not passed, or if it is garbled, the entire missile operation cycle may cease to function as required. A task is also considered critical whenever equipment design characteristics demand human performance which approaches the limits of human capabilities (e.g., human performance functions and tasks are too demanding, information presented to personnel is inadequate to meet human performance requirements, appropriate information displayed is not perceived, or controls provided cannot be effectively operated) and thereby significantly contributes to the occurrence of one or more of the following conditions, but not necessarily limited thereto:
a. Jeopardized performance of a mission
b. Degradation of mission effectiveness or completion from inaccurate performance; e.g., human entry or response error predicted required system performance.
c. Degradation of the circular error probability (CEP) to an unacceptable level
d. Delay of a mission beyond acceptable time limits; e.g., human time to react will not meet required system reaction time
e. Improper operation resulting in a system "no-go," inadvertent weapons firing, or failure to achieve operational readiness alert
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