MIL-DTL-6484D
3.8.7 Mounting base. The light shall be provided with a mounting base, manufactured in accordance with
MS17246 unless specified without a mounting base by adding "A" to MS part number. The force required to remove
the light out of the mounting base shall be greater than 1 and less than 5 pounds.
3.8.7.1 Mount. The mount on the cockpit light assemblies shall be designed for installing the lights in the
MS17246 mounting base. The design of the mount shall be one of two types, straight or offset. The straight mount
shall be such as to permit the beam of the light assembly to be raised or lowered not less than 35 degrees above or
below a plane through the axis of symmetry of the assembly. The offset mount shall be capable of rotating the beam
of the light not less than 90 degrees in a plane perpendicular to the surface of the mounting base. Both mounts as
specified in applicable specification sheets or MS drawings shall be capable of rotating the beam of the light 360
degrees parallel to the mounting surface.
3.8.7.1.1 Clip assembly. The cockpit light assemblies when used on some aircraft require an alligator clip for
mounting and fastening to the pilot's clipboard, map table, etc. MS27424, Clip Assembly, has been designed
specifically for use with the MS17246 for this purpose. The clips are to be stocked separately, but may be procured
with the cockpit light assemblies if they are for production aircraft or initial installations. Extra clip/base assemblies
may be provided in aircraft requiring both the fixed and the clip bases so that they may be removed from the fixed
base and placed in the clip/base assembly (see 6.2).
3.8.8 Cord. The cockpit light assemblies shall be furnished complete with a molded coiled-type retractable
two-conductor cord. The conductors shall be stranded and shall be no smaller than size No. 23 AWG (.0226 inch
diameter). Unless otherwise specified in the applicable specification sheet or MS drawing, the maximum length of
the coiled cord shall be not greater than 11 inches with a helical diameter approximately .875 inches in the fully
retracted position, and shall have an extended length of not less than 50 inches when a two pound weight is hung on
the free end of the coiled section at room temperature, approximately 25 degrees centigrade. The cord shall be such
that it will return to its normal coiled position when the weight is removed. The cord shall have one end connected to
the light either at the rear of the light or on the side adjacent to and to the rear of the mount. The other end of the cord
shall have the outer jacket removed for approximately 1.50 inches from the end. The wire insulation inside or the
outer jacket shall be white for the positive lead and black for the negative lead. The wire insulation shall be stripped
back from the end of each wire approximately .375 inches and the exposed stranded wire shall be tinned.
3.8.8.1 Terminals. The light assemblies shall be supplied without terminals to the outer end of cord as shown
on applicable military standard (MS) drawing or specification sheet.
3.8.9 Lamp. The lamp used in the assembly shall be as specified in the applicable specification sheet or MS
drawing. One lamp shall be supplied installed on each cockpit light assembly.
3.9 Light distribution. The light distribution shall be as specified in the applicable specification sheet, MS
drawing, or as stated herein. The light assembly when operated to emit or corrected to 3.5 mean spherical candle-
power and not filtered shall produce a spot or flood light of approximately uniform intensity equal to or in excess of
the values specified below:
3.9.1 Floodlight. Adjusted to provide a floodlight, the light emitted shall be no less than two candle-power, 45
degrees wide in either of two planes passing through the axis of symmetry of the assembly. One plane shall be
perpendicular to the plane of the filament.
3.9.2 Spotlight. Adjusted to provide a spotlight (i.e. the lamp filament is approximately at the focal point of the
lens), the light emitted shall be not less than 40 candle-power, two degrees wide in either of two planes passing
through the axis of symmetry of the assembly. One plane shall be perpendicular to the plane of the filament and the
other in the plane of the filament.
3.10 Interchangeability. All parts having the same manufacturer's part number shall be directly and completely
interchangeable with each other with respect to installation and performance.
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