MIL-DTL-26202E
3.4.3.1 Gaskets. All gasket material shall conform to class 2A, grade 60 of A-A-59588. One gasket
conforming to MS26577 shall be furnished with each base mounted light. All other gaskets required
to provide satisfactory water seal shall be furnished with each light.
3.4.3.2 Sealing compounds and gaskets. Compounds when used to seal lenses, prisms, or
reflectors shall be of a type that will not run after long exposure in the sun, or operation of the lights at
full output. The compound shall not harden or check after extended use and shall remain mastic and
not lose its water sealing properties after extended use. Prisms shall be cemented or gasketed and
securely held so that excessive stresses are not imposed on the glass during any of the specified
load conditions and a satisfactory water seal is maintained.
3.5 Design and construction. All lights shall be designed in accordance with the applicable military
standard (MS) and shall be so designed and constructed that no parts will work loose in service.
Lights shall withstand the strains, jars, vibration, and other conditions incident to shipping, storage,
installation, and service.
3.5.1 Optional design. The overall design of the light and internal details are optional provided all
requirements are met, interchangeability is not affected, and that the design is approved by the
qualifying activity.
3.5.2 Design conditions. All lights shall be designed for continuous outdoor operation under all
weather conditions.
3.5.2.1 No portion of the Lights shall project above the surface of the pavement by more than the
amount specified on the MS. Portions which do project above the pavement level shall be sloped at
an angle not exceeding the values specified on the MS. Base-mounted lights shall present a smooth
exterior surface in all directions, but glassware may be recessed. Recesses shall be so shaped that
they will be self-cleaning by wind and rain action, and shall include no corners or ridges which would
act as dirt traps or cut tires.
3.5.3 Design loads. All lights shall be designed to withstand a static load of 50,000 pounds due to an
aircraft wheel and tire.
3.5.3.1 Loads. When correctly installed, all lights shall withstand being run over by snow removal
equipment, trucks, grass mowers, etc., without damage to the equipment or light. The lights shall
withstand being run over from any direction and any part of the snow removal equipment, including
dolly wheels or shoes, rotary blades, and tires with chains.
3.5.3.2 All lights shall be designed so that nosewheel, outrigger wheels and main landing gear
wheels of aircraft are not subjected to any appreciably greater stresses when hitting or striking a light
from any direction than they would be normally subject to when hitting or rolling over the surface of
the runway (see 4.5.9 and 4.5.10). A light shall not cause a rolling wheel to change its direction of
travel (I.e., a grid shall be so designed that it will not cause a tire to turn and roll parallel to the grid).
3.5.3.3 All lights shall be so designed that if the wheel of those aircraft using a 6.00 x 2 tire runs over
the light from any direction, the wheel shall not be damaged or caught, and the light shall not be
damaged.
3.5.3.4 All lights shall be designed to provide sufficient supporting surface for aircraft tires and to
minimize abrupt changes in tire deflection. A light shall not cause the average deflection of a tire to
be more than 30 percent greater than the deflection the tire would normally experience on contact
with the surface of a runway with the same total loading.
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