MIL-DTL-5904E
for attachment of color filters. The holes shall be tapped to a depth of at least .375 inches for
no. 8-32 screws. After installation, the lower surface of the lens flange shall be approximately
.094 inches below the upper surface of the bosses, and the lower surface of the color filter flange
shall be approximately .250 inches below the upper surface of the bosses. All above apply to the
class II and III light assemblies with exceptions that the lens is secured with a band clamp, it is
not necessary to tilt the light assembly 4° towards the runway, re-lamping is accomplished by
removing the band clamp, and the four bosses do not apply to class II and III light assemblies.
3.4.6.1 Mounting. The housing shall be designed so that it may be mounted upon an
unthreaded mounting tube having an external diameter of 2.375 ±.035 inches. Two or three
1/4-20 round or fillet head, stainless steel set screws shall be installed in the housing for
clamping the housing on the tube. When mounted upon the tube, the tube shall extend
2.125 ±.125 inches into the light. The class II and III light assemblies shall have the frangible
coupling as part of the light base. The bottom of the light base shall be a 2.0 inch tapered pipe
thread designed to fit into standard United States Air Force and FAA airport base plates and
mounting stakes.
3.4.6.2 Horizontal adjustment. Horizontal adjustment of the light to any desired azimuth
shall be obtained by rotating the housing on the mounting tube.
3.4.6.3 Leveling adjustment. The lower portion of the housing shall be designed to
provide leveling of the light from any position not exceeding 4° for the vertical. The leveling
device shall be of the pivot type, adjustable by means of 3 or 4 screws. The screws shall be
stainless steel size no. 8 or larger. The leveling device shall be independent of the horizontal
adjustment.
3.4.6.4 Aiming. The housing shall provide a means for leveling and sighting, designed
to insure aiming of the light with sufficient accuracy so that the direction of the light beams will
be in accordance with the requirements specified in 3.5.1. The leveling device may be an
accurately formed surface upon which a carpenter's level may be placed in two positions at right
angles during installation. The sight may be any device or marks placed upon the light in such a
manner as to provide accurate aiming by sighting at the next light in the row of runway lights.
Removal of the lens and filters form the upper portion of the housing shall not be required during
the leveling and aiming procedure.
3.4.7 Cord. A length of two-conductor, no. 16 American Wire Gauge (AWG), type SJ or
OSJ rubber or synthetic rubber cord shall be connected to the bottom of the socket, and no
portion of the cord shall extend up beside the socket where it would be exposed to excessive
temperatures. A 2-pole, 600 V, 20 amp plug in accordance with style 1 of FAA AC 150/5345-26
shall be molded on the lower end of the cord. The length of the cord shall be such that, when
hanging freely, the distance between the bottom of the assembly and the face of the plug shall be
7.00 ±.50 inches. The socket mounting bracket shall be cut away on at least two sides, so that a
screw driver blade may be used to push slack cord down into the mounting tube during
installation. A suitable fiberglass sleeve at least 2.0 inches long shall be applied to each of the
two conductors from which the cable sheath has been stripped in order to protect the installation
of the conductors from the high temperatures existing at the bottom and sides of the socket. The
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