MIL-DTL-5904E
3.4.3 Filters. Class I light filters, when required, shall be of class B, heat-resistant glass,
in accordance with MIL-DTL-7989, and shall be in accordance with figure 3. The corners on the
mounting flange of each nominal 180° filter shall be cut at an angle of 45° in order that the filter
may be indexed by lugs which are .188 inches wide by .156 inches high with a .094 inch radius
at top. Filters shall be shipped separately and shall be of the color specified by the procuring
activity. Two mounting clips in accordance with figure 3 and two number (no.) 8-32 x .375
machine screws of stainless steel shall be supplied with each filter. Unless otherwise specified,
each filter shall cover 108 +0/-5° (see 6.2). The requirements for color beams in the class II and
III light assemblies shall be accomplished by using colored domes in accordance with the
configuration shown in figure 4 except that class III light is not intended for use with red/green
lenses normally used in threshold light applications. These colored domes shall be of one piece
construction. Aviation colors shall be in accordance with SAE AS25050. All glass shall be
high-grade heat-resistant glass.
3.4.4 Lamp. The class I light assembly shall be designed to utilize a 204 W, 6.6 amp
incandescent lamp. The class I lamp shall be equal to and interchangeable with General Electric
Lighting (GE) 23300-6.6A/T14/2P. The class II light assembly shall be designed to utilize a
200 W, 6.6 amp halogen cycle lamp. The class III light assembly shall be designed to utilize a
100 W, 6.6 amp, C-6 filament construction lamp. The class III lamp shall be equal to and
interchangeable with GE Q200T4/CL. All lamps shall have a minimum average life cycle of
500 hours. Unless otherwise specified (see 6.2), the lamp shall not be furnished with the light.
3.4.5 Socket. For class I light assemblies, the lamp socket shall be a ceramic, ventilated,
medium-prefocus type having a rating of 1000 W, 250 volt (V), equal to and interchangeable
with Amphenol Corporation PN 98-1. The socket shall accommodate lamps having base
dimensions within the tolerances specified for the lamp. The class II and III light sockets shall
accommodate lamps having base dimensions within the tolerances of lamps specified in 3.4.4.
3.4.6 Housing. The lens, filters, shield, and lamp shall be accurately and securely
positioned by utilizing a lightweight aluminum housing. Four spring clips as shown on figure 5
shall be used to secure the lens to the housing. Indexing lugs shall be located on the housing to
engage the slots in the mounting flanges of the lens and filters. The indexing lugs shall be of
sufficient size to limit the rotation of the lens and filters to not more than 1°. The lugs which
index the lens shall not extend up into the mounting flange slots more than .188 inches after the
light is assembled. The housing shall support the lens, filters, shield and lamp so that they are
tilted 4° downward toward the runway side after the light has been leveled. A .125 inch rubber
or synthetic rubber gasket shall separate the housing and the lens. All gaskets and other
materials shall be of a type which will not emit smoke or vapor during rated current operations
within the specified temperature range. The design of the housing shall be such that no
ventilation is required, condensation upon lens and filter is minimized, and drainage is provided
to prevent the gradual accumulation of condensate. The upper portion of the housing shall
contain the lens and filters and shall be readily separable from the lower portion for re-lamping
by loosening one wing screw. Upper and lower portions of the housing shall be properly
indexed to insure aiming within the required tolerances. The lens and filters shall be securely
clamped in place but shall be readily removable for maintenance. Four bosses, containing four
equally spaced holes with centers located on a circle 5.438 inches in diameter, shall be provide
5
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business