MIL-DTL-8954C
3.2 Materials.
3.2.1 Metals. The metals shall be as specified herein and on the Military Standard (MS) as applicable. Unless
otherwise specified, metals shall be of the corrosion-resistant type or treated to resist corrosion. Dissimilar metals, when
used, shall be in accordance with MIL-STD-889.
3.3 Design and construction. The design construction shall be in accordance with the applicable MS.
3.3.1 Bases (with flanged hubs). The bases shall be in accordance with MS24526. The cylinder, including sides
and bottom, shall be fabricated of sheet steel. All seams shall be externally welded and watertight. The top flange shall
be steel plate. After complete fabrication and galvanizing, the top surface of the flange shall lie entirely between two
planes that are perpendicular to the light base axis and separated by .030 inch. The side wall of the base shall lie entirely
within two concentric right circular cylinders parallel to the light base axis spaced .3 inch apart.
3.3.1.1 Base finish. After fabrication, the base shall be corrosion protected by hot-dip galvanizing in accordance
with ASTM A153/A153M. Immediately after plating, the gasket surface (opposite end from flanges) shall be wiped
smooth, suitable for a proper sealing surface.
3.3.1.2 Flange hubs. Two 2-inch steel tank flanges, or equivalent, shall be welded to the cylinder 180º ±1º apart,
random location in relation to bolt holes in top flange, and shall not deviate more than 1º from the perpendicular to the
base axis. Flange welds shall be continuous and external. Projection beyond the body of the base shall not exceed 2.5
inches. Threads shall be protected with an antiseize and anticorrosive compound.
3.3.2 Base plate assembly. The base plate assembly shall be in accordance with MS24345. Ferrous materials
shall be used. After fabrication, hot-dip galvanizing shall be applied in accordance with ASTM A153/A153M.
Immediately after plating, the gasket surface shall be wiped smooth, suitable for a proper sealing surface.
3.3.3 Blank cover. Blank base covers used shall be in accordance with MS26580. After fabrication, hot-dip
galvanizing shall applied in accordance with ASTM A153/A153M. Immediately after plating, the gasket surface shall be
wiped smooth, suitable for a proper sealing surface.
3.3.4 Gaskets and seal. Unless otherwise specified, all gaskets and seals shall be made of material as designated
on the applicable MS.
3.3.4.1 Airport marker light base gasket. Marker light base gaskets shall be in accordance with MS26577. One
gasket shall be packaged with each base plate assembly, adapter plate, or blank cover. Gaskets shall not be furnished with
the bases.
3.3.5 Frangible coupling. Frangible couplings used with base plate assemblies shall be in accordance with
MS17814.
3.3.6 Cable clamp. Cable clamps shall be in accordance with MS17815.
3.3.7 Washer seal. Six seal washers in accordance with MS21205 shall be supplied with each base plate
assembly and blank cover.
3.3.8 Connector retainer. One steel connector retainer in accordance with MS24345 shall be supplied with each
base plate assembly.
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