Specifications

MIL-STD- 1472E
5.14 Aerosuace vehicle compartments.
5.14.1 GcncraL Aerospace vehicle compartments shaJl be designed to optimize human
performance, efficiency, and safety within the constraints imposed by system requirements.
5.14.1.1 Windows, canopies, and windshields.
5.14.1.1.1 Visual mxformance. Transparent areas shall be free from color, distortion, or other
factors that would degrade visual performance below the level required for mission accomplishment.
5.14.1.1.2 MuJtiJawxed windows. Visual performance shaJJnot be &graded below the level
required for mission accomplishment by loss of light transmission or by muh.ircfkctions resulting ffom
multilayered windows.
5.14 .1.1.3 Ar@e of incidenee. When undistorted extemaJ vision is required, the angle of
incidence (see MIHIDBK- 1908)shall not exceed 60°.
5.14.1.1.4 Unobstructed visiou Windows and canopies shaJl provide optimum unobstructed
vision. Width of structural members in the line of vision should not execed 56 mm (2.2 in).
5.14.1 .1.5 Head-lm disphws.
5.14.1 .1.5.1 GeneraL Head-up displays shall be compatible with the capabtities and JinWuions
of the human viswd system. Information presented on head-up dispJays shaJJbe limited to critiezddata
which the operator is re.@red to monitor whiJe simultamxmd y performing some primary visual task.
5.14.1 .1.5.2 Symbol brightness. Symbols shaJlbe bright enough to be legible under aJl
expected ambient Jigbting conditions. Symbol brightness shzdlbe not less than 5000 cd/m2 ( 1500
footlamberts) when legibility in direct sunJight or background luminance of 34,(XX)ed/m2 (10,000
footJamberts) or greater is required. For most high ambient light applications, symbol brightness
should be 6,900-10,300 cd/m2 (2,000 -3,000 footlamberts).
5.14.1 .1.5.3 kzibi.hty. Sufficient contrast AaiJ be provided to ensure symbol Legibilityunder
aJlexpected viewing renditions.
5.14.1 .1.5.4 Field of view. Head-up displays should have a minimum field of view of 350
mad (20°) in the vertical plane and 490 mrad (28°) in the horizontal plane.
5.14.1 .1.5.5 Exit puPiJ. Head-up displays shaJIhave a minimum exit pupil (that area within a
collimated beam in which the enthe
image formed by an objective l~ns is capable of being seen) of 72
mm (2.8”).
5.14.1 .1.5,6 SWTW line width. The line width of symbols used in head-up dispJays shall be
not less than 0.5 mrad (1.7 rein). For most applications, symbol line width should be 1.0* 0.2 mrad
(3.4 A0.7 rein).
5.14.1.2 Instrument location. Instruments shall be located so that, with glare shields and bezels
in place, they can be easily read by appropriate crew members.
$ 142. I Aircrew stations (aeronautical) I-lurnnnF,ngineering design of pilot and copilot
st~titmsno[ covered in contractual d&]m&ts shall hc in accordance with the criteria in this standard