MIL-DTL-5904E
3.2 Components. The light shall consist of the following:
Item no.
Description
See requirement
1
Lens
3.4.2
2
Filters
3.4.3
3
Lamp
3.4.4
4
Socket
3.4.5
5
Housing
3.4.6
6
Cord
3.4.7
3.3 Materials.
3.3.1 Fungus-proof materials. Materials that are nutrients for fungi shall not be used
where it is practical to avoid them. Where used and not hermetically sealed, they shall be treated
with a fungicidal agent acceptable to the procuring activity. However, if they will be used in a
hermetically sealed enclosure, fungicidal treatment will not be necessary.
3.4 Design and construction. The light shall be so designed that it will operate
satisfactorily under all weather conditions and so constructed that no parts will work loose in
service. It shall be built to withstand the strains, jars, vibrations, and other conditions incident to
shipping, storage, installation, and service. The light shall be so constructed that adjustments
and repairs can be easily made by the personnel of operating units and overhaul bases with tools
normally available commercially. The light shall be so designed that weight is held to the
minimum consistent with the necessary strength and rigidity. The exact shape and design are
optional provided all requirements specified herein are met.
3.4.1 Focus. The entire optical system shall be of the fixed prefocus type requiring no
focusing at installation or in service.
3.4.2 Lens. The lens for class I light shall be in accordance with figure 1, of one piece
construction, and shall utilize both internal and external prisms. The three indexing slots shown
in figure 1 need not run completely through the mounting flange as shown, but may extend up
into the flange a minimum of .219 inches from the bottom. The lenses for class II and III lights
shall be in accordance with figure 2 of one piece construction and shall be smooth external
construction. The lenses shall be marked with an arrow and the words RUNWAY SIDE as
indicated. The glass shall be type I, aviation white, in accordance with SAE AS25050, and
class B, heat-resistant, in accordance with MIL-DTL-7989.
3.4.2.1 Shield. If the design of the lens requires shielding in order to limit the light
emitted on the runway side, a suitable shield shall be attached to the lens. A shield, when used,
shall be considered a part of the lens and shall be securely fastened to the lens so that no
adjustment or positioning of the shield is required when a lens is mounted upon any approved
housing. The shield, when used, shall also serve as a reflector in order to improve the light
distribution.
4
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