Switch/Control Labeling - Each switch/control shall be labeled to indicate its function to the operator. Controls and displays on separate panels are discouraged. ![]() ![]() The two panels shall not be mounted facing each other. Separate Panels - When functionally related controls and displays must be located on separate panels and both panels are mounted at approximately the same angle relative to the operator, the control positions on one panel shall correspond to the associated display positions on the other panel. Multiple Displays - When the manipulation of one control requires the reading of several displays, the control shall be placed as near as possible to the related displays, but not so as to obscure displays when manipulating the control. However, this type of arrangement shall be avoided whenever possible. Vertical and Horizontal Arrays - If a horizontal row of displays must be associated with a vertical column of controls or vice versa, the farthest left item in the horizontal array shall correspond to the top item in the vertical array, etc. Left-to-Right Arrangement - If controls must be arranged in fewer rows than displays, controls affecting the top row of displays shall be positioned at the far left controls affecting the second row of displays shall be placed immediately to right of the these, etc.į. Functional Group Markings - If several functional groupings of displays and controls are placed in close proximity on a control panel, an effective means of discriminating between them shall be provided (e.g., color coding or outlining).Į. If controls are not to be utilized in any specific sequence, then consider arranging them by importance with the most important or frequently used control in the most accessible position.ĭ. Logical Flow Grouping - When there is not a unique sequence or functional grouping of control actions, controls and displays shall be arranged in a manner consistent with their logical flow. Within a functional group, the sequence shall be from left to right or top to bottom whenever feasible.Ĭ. Sequential Grouping - When a unique sequence of control actions exists, the controls and/or displays shall be arranged in relation to one another according to their sequence of use. Functional Grouping - Displays and/or controls that are functionally related shall be located in proximity to one another - arranged in functional groups (e.g., power, status, test).ī. Requirements for grouping controls and displays are listed below.Ī. 9.2.3.2.3 Control/Display Grouping Design Requirements These positive indications shall be used consistently throughout the space module. Display Functionality - Displays shall provide positive and unambiguous indication of system state (e.g., a light indicating power on, a blinking cursor indicating ready). Simultaneous Use - A visual display that must be monitored concurrently with manipulation of a related control shall be located so that it can be read to within required accuracy while adjusting the control.Į. The angle between the line-of-sight and the normal to the display shall always be less than 30 degrees.ĭ. ![]() Orientation - Display faces shall be perpendicular to the operator's line-of-sight whenever feasible. Parallax Error - Displays shall be located so that they can be read from the design eye point with no discernible parallax.Ĭ. ![]() Accessibility - Displays shall be visually accessible.ī. Requirements for designing readable displays are provided below.Ī. 4.9-9, NASA-STD-3000 256 9.2.3.2.2 Display Readability Design Requirementsĭisplays shall be located and designed so that they may be read, to the degree of accuracy required, by personnel in the normal operating or servicing positions without requiring the operator to assume an uncomfortable, awkward, or unsafe position. Spacing Requirements for Ungloved Operation Miniature controls - Spacing of miniature controls, intended for ungloved hand operation, shall maintain the same clearance footprint about each control (i.e., the edge-to-edge separation between the pair of controls located on either side of a third control) as indicated inįigure 9.2.3.2.1-1. (Refer to Paragraph 14.4.3.2, EVA Control and Display Design Requirements, for specific requirements.)Ĭ. Gloved Operation - All space modules shall have those controls necessary for maintenance and recovery following a depressurization (e.g., as a result of a micro-meteoroid hit), operable by a pressure-suited crewmember. Normal Spacing - Minimum and preferred spacing for different types of controls (for the ungloved condition) shall be shown inī. Requirements for control spacing are provided below.Ī. 9.2.3.2.1 Control Spacing Design Requirements
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