MIL-DTL-26202E
4.5.7 Static load. Sample class B and BB lights, less any components which would not affect test
results, shall be mounted upon a rigid steel ring having inside diameter of 8 inches. A compressive
load shall be applied at a rate of approximately 20,000 pounds per minute to the top of the light by
means of a flat plate (not to exceed the centermost 20 square inches of the top of the light unit),
through a rubber or synthetic rubber block 1-1/2 inches thick, having a Shore A hardness of 55-70.
The block shall be at least as large as the flat plate. A light shall be considered unsatisfactory if
failure, as evidenced by cracking or breaking of the casting, prisms, lenses, or other components,
occurs before the applied load reaches 50,000 pounds. If the light unit under test does not provide a
flat surface of 20 square inches or more, all of which is concentric around the center of the light and
parallel to the plane through which the load is applied, means may be employed to provide uniform
load distribution over the centermost area, not to exceed 20 square inches.
4.5.8 Leakage. The leakage test of 4.5.4 shall be repeated.
4.5.9 Tire load. One light of each class, less any components which would not affect test results,
shall be suitably mounted on a testing machine. The testing machine shall apply a slowly increasing
load to the light by means of a 32 x 8.8 tire, inflated to an initial pressure of 325 psi. The final wheel
loading shall be 50,000 pounds. There shall be no damage to the tire or to the light.
4.5.10 Tire deflection. A light shall be suitably mounted on a testing machine and a load applied by
means of a 20 x 4.4, 10-ply tire, inflated to an initial air pressure of 155 psi. The deflection of the tire
on the light and upon a flat steel plate shall be measured when the load is 3,750 pounds and when
the load is 10,000 pounds. The average deflection of the tire on the light shall not exceed the
deflection on the plate by more than 30 percent. The tire shall be oriented on the light so that
maximum deflection is obtained. Average tire deflection shall be determined by measuring changes
in wheel height produced by the different conditions.
4.5.11 Vehicle. A light shall be properly installed in the pavement and run over in any direction by
the methods specified below. Any serious damage to the light or vehicle, or evidence that the light is
unsatisfactory for the intended application, shall be cause for rejection:
(a) By a 3/4-ton truck, with snow chains on the tires. One run shall be made at 5 miles per
hour (mph) and another at 30 mph.
(b) By a Walter Snow Fighter, Model FBCS, or equal, with snow chains on the tires, and the
snowplow blade set so there is approximately 3/16 inch clearance with the surface of the
runway. Five passes shall be made over the light at speeds up to 10 mph. During at
least two of the passes, tires and shoe shall run over the light.
4.5.12 Aircraft stress. A properly installed light shall be run over by any aircraft considered
necessary to determine that tailwheels, nosewheels, outrigger wheels, main landing gear wheels and
tailhooks are not subjected to abnormal stresses which would result in damage to the aircraft or the
Light. Any serious damage to the light or aircraft or evidence that the light is unsatisfactory for the
intended application shall be cause for rejection.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house
contractor personnel, these personnel need to contact the responsible packaging activity to ascertain
packaging requirements. Packaging requirements are maintained by the Inventory Control Point's
packaging activities within the Military Service or Defense Agency, or within the military service's
system commands. Packaging data retrieval is available from the managing Military Department's or
Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
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