MIL-DTL-5904E
electrical plug and cord for the class II and III lights shall be Teflon coated wire with integral
molded plug in accordance with FAA AC 150/5345-26. The cord set shall be rated for 302 °F
(150 °C) operation.
3.5 Performance.
3.5.1 Photometric. The light distribution shall be asymmetrical with front and rear
beams having an elevation of 4.5° and a toe-in of 3.5°. (The corresponding horizontal angles are
86.5° and 273.5°. The 90° to 270° horizontal line is parallel to the runway centerline and the 0°
horizontal direction is toward and perpendicular to the runway centerline.) The light
distribution, when the light is equipped with the specified lamp operating at, or corrected to,
rated lumens and after all parts of the light reach normal operating temperatures shall be in
accordance with the following requirements:
3.5.1.1 Clear (white) lights. White lights shall be designed to comply with the following
design goals as closely as possible and all lights shall comply with the following production
requirements:
3.5.1.1.1 Design goals. The design goal minimum for each beam shall be of rectangular
cross-section having dimensions of 6° horizontal and 6° vertical at 20,000 candlepower (cp) and
11° horizontal and 10° vertical at 5,000 cp. The design goal minimum for circling guidance light
shall be 500 cp from 92° to 268° horizontal at elevations of 4.5° to 12.5° vertical. The design
goal minimum shall be 20 cp in all directions above the horizontal for which other maximums
are not specified. The design goal maximum for on-runway light shall be 100 cp from 320° to
40° horizontal at elevation of 0° to 15° vertical. The design goal maximum for the beams shall
be 50,000 cp.
3.5.1.1.2 Production requirements. It is recognized that mold wear and manufacturing
tolerances will make the design goal requirements difficult to hold on production item lights.
Lights shall be considered satisfactory if they comply with design goals when the following
tolerances are applied.
3.5.1.1.2.1 Beam axes. The beam axes shall be within 1.5° of the specified 4.5°
elevation and 3.5° toe-in angles when the light has been properly leveled and correctly aimed by
means of the built-in sight.
3.5.1.1.2.2 Rectangular beam. The dimensions to the rectangular beams may be reduced
to 5° horizontal and 4° vertical with rounded corners of 2° radii at 20,000 cp and 10° horizontal
and 9° vertical with rounded corners of 4° radii at 5,000 cp.
3.5.1.1.2.3 Circling guidance. The 500 cp minimum for circling guidance light may be
reduced to 400 cp. Two dips down to a minimum of 250 cp will be permitted if each dip does
not cover more than 5° horizontal at 400 cp and the two dips are separated by at least 50°
horizontal at 400 cp.
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