MIL-DTL-25971C
holder designed to minimize breakage of the filters. When either filter is positioned between the
lamp and principal reflector, all light from the lamp incident upon the reflector shall pass through
the filter. There shall be no direct light from the lamp.
3.4.1.6 Cover. A clear cover shall be provided at the front of the housing. The cover
shall be class D plastic in accordance with MIL-DTL-7989. The color and transmission of the
cover shall be type I, grade D, aviation white ware in accordance with SAE AS25050.
3.4.1.6.1 The cover shall be firmly held in a holder designed to fit on the front of the
housing. This holder and cover assembly shall allow quick removal of the assembly without the
use of tools.
3.4.1.7 Color indicator. A plastic prism device shall be provided at the front of the light
to redirect a small part of the main beam to the operator's eye. The color indicator shall be of
sufficient brightness that an operator with normal vision can distinguish the color of the filter in
use in bright daylight. A dimming method shall be provided to regulate this color indicating
beam when the redirected light is too bright for comfortable use at night.
3.4.1.8 Sighting device. A sighting device with front and rear sights shall be provided
along the top of the light so that the light can be properly aimed. The centerline of the sight shall
be parallel to the optical axis of the light.
3.4.1.9 Handle. The light shall be provided with a handle of such design that the light
can be held, aimed, and operated by one hand. The handle and associate controls shall be equal
to those defined by FAA-E-2214 and FAA Drawings D-5056-1 through -12, except as specified
in 3.7. The following controls shall be provided:
a. A trigger button for turning the light on and flashing it.
b. A trigger level for selection and positioning the red or green color filter. The red
filter shall be properly positioned to provide a red signal beam when the trigger lever is in its
normal, unpressed position.
c. A trigger lever for selecting a clear signal.
3.4.1.9.1 A handle with components different from those defined above will be
considered satisfactory if performance is equivalent and the design is approved by procuring
activity.
3.4.1.10 Receptacle. An MS3102A-10SL-4P receptacle shall be provided on the side of
the light for attaching the power lead.
3.4.1.11 Hanger. A yoke-type hanger or other means shall be provided so that the light
can be suspended from an overhead wire. The axis of the housing shall be essentially parallel to
the ground when the light is hanging from the overhead wire. If a yoke-type hanger or similar
device is used, it shall be readily removable from the light.
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