MIL-HDBK-1908B
Hearing damage-risk criteria (DRC) snv. Comprehensive statements about the relation between various descriptive parameters of the noise exposure (e.g., sound pressure level, exposure time) and the probability of temporary or permanent hearing loss.
Hearing Protectors snv. Devices designed primarily to reduce the noise reaching the auditory system. They may be of any type: earplugs, noise muffs (circumaural), or attenuating helmets or headsets.
Helmet-mounted display (HMD) gen. A display that projects video imagery, symbolic and/or alphanumeric information on a display medium (e.g., combining glass or visor) into one or both eyes of the crewmember. In most aeronautical system applications the display medium is attached to a flight helmet which is a part of a head tracking system. The line of sight of the helmet is determined by the head tracking system and a designated sensor is slewed in a one-to-one angular correspondence with this line of sight. The display medium then displays the image from the designated sensor: television (TV), forward looking infrared (FLIR), or scan converted radar. Specific symbols and formats can be selectable for a given mode of operation.
Help uci. A capability that displays information upon user request for on-line guidance. HELP may inform a user generally about system capabilities, or may provide more specific guidance in data or information handling transactions.
Highlighting uci. Emphasizing displayed data or format features in some way, e.g., through the use of underlining, bolding, or inverse video.
Hooking uci. A task performed by a human operator using a display interactive device (e.g., joystick, mouse) to select/designate specific display information (e.g., symbols) for further action or modification.
Horizontal situation display (HSD) gen. An HSD is a display which aids the crew members in navigation. Basically, it consists of heading, distance-to-go, bearing-to-destination or some other navigation facility or reference, track, map, course, aircraft position, and steering error. Modes may consist of manual, north-up, track-up, data, test, and off. Selection of map scale factors may also be provided. Navigation update can be accomplished with the proper computer techniques. The HSD also has the capability of combining symbols with the map information. Symbols may be used for annotation of the projected map, such as check points, various legs of the mission, high-risk areas, ground track deviation, and radar homing and threat warning. Specific modes and formats can be selectable for a given mode of operation.
Hover, in ground effect gen. A condition when the helicopter is motionless with respect to the ground and the rotor is operating at one rotor diameter height or less above ground level.
Human engineering gen. The application of knowledge about human capabilities and limitations to system or equipment design and development to achieve efficient, effective, and safe system performance at minimum cost and manpower, skill, and training demands. Human engineering assures that the system or equipment design, required human tasks, and work environment are compatible with the sensory, perceptual, mental, and physical attributes of the personnel who will operate, maintain, control and support it.
Human engineering design criteria gen. Stated limits on design to achieve the objectives of human engineering. (See "Human engineering.")
Human factors gen. A body of scientific facts about human characteristics. The term covers all biomedical and psychosocial considerations; it includes, but is not limited to, principles and applications in the areas of human engineering, personnel selection, training, life support, job performance aids, and human performance evaluation.
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