MIL-DTL-26202E
3.5.3.5 Base-mounted lights shall be provided with a rib, in the area of the glassware to permit
aircraft arrestment tailhooks 2 inches or more in width to ride over the light without damaging the light
or the tailhook. Recesses shall be so designed that the glassware will not be touched by snowplow
blades, or wheels 2 inches or more in width.
3.5.4 Optical components. All prisms , lenses, and reflectors shall be grade B of MIL-C-7989, except
they shall be tempered to withstand the temperature shock of 4.5.6.
3.5.4.1 Reflectors. All reflectors used in a light shall be provided with a finish of high specular
reflectivity, and shall be protected, insofar as possible, from dirt, tarnishing end corrosion.
3.5.5 Lamp lead.
3.5.5.1 Base-mounted lights. Each base-mounted light shall be supplied with a 16-inch-long lead
assembly consisting of two single leads each having a 12-AWG bunch stranded, type SFF-2
conductors. A two-pole, 600-volt (V), 20-amp plug with pins and mating surfaces in accordance with
the plug specified in FAA Specification L-823, figure 1A shall be molded on the lower ends of the
assembly. The plug shall be molded from a suitable compound which will not deteriorate at
temperatures of 150 °C. The top ends of the leads shall be provided with a high temperature lug
suitable for connecting to the screw terminals of a PAR-56 lamp.
3.5.6 Circuits and transformers. Each light shall be designed for connection to a series circuit
through the isolating transformer specified on the MS. All transformers shall be in accordance with
MIL-T-27535. Unless otherwise specified, transformers shall not be furnished with the light (see 6.2).
3.5.7 Adjustment and repairs. All lights shall be so constructed that routine adjustments and repairs
can easily be made with tools normally available commercially.
3.5.8.1 Housing. Unless otherwise specified in the contract or order, the housing material shall be
ductile iron having a minimum tensile strength of 70,000 pounds per square inch (psi), a minimum
yield strength of 50,000 psi, a minimum elongation of 12 percent, and a Brinell hardness of not less
than 166 (see 6.2 (k)). If a non-corrosion proof material is used, the housing shall be plated after
machining. Plating shall conform to class Fe/Zn 12, type I of ASTM B633. The top surface of the
housing shall be painted with enamel conforming to Master Painters Institute (MPI) Reference #9; the
color shall be aviation orange 12197 of FED-STD-595. Other portions of the housing may be
fabricated of any metal satisfactory for the application, and shall be of skeleton construction in order
to reduce the weight of the light. Construction shall be such that condensate, or water leaking into
the light, will not drip on the lamp.
3.5.8.1.1 Base-mounted lights shall be designed for installation on a MS24526 base. The base will
be set so that its top is 3/4 inch below the surface of the pavement. Unless otherwise specified, the
base shall not be furnished with the light (see 6.2).
3.5.8.1.1.1 The housing of each base-mounted light shall consist essentially of a smoothly sloped
casting or forging of sufficient strength to withstand the snowplow and aircraft wheel tests, and
adequately protect the glass prisms and all other parts of the optical system. The lower portion of the
housing shall have a diameter as specified on the MS and shall extend at least 1/4 inch down into the
base.
3.5.8.2 Slots. Two screwdriver slots shall be provided in the bottom rim of the housing in order that
the housing can be pried up readily from the base to facilitate removal of the lamp. Slots shall be as
specified on the MS.
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