MIL-DTL-25971C
3.4 Components. The light shall consist of the following major components:
Item no.
Quantity
Description
Requirement Paragraph
1
1
Housing
2
1
Principal reflector
3
1
Auxiliary reflector
4
1
Lamp
5
2
Colored filters
6
1
Cover
7
1
Color indicator
8
1
Sighting device
9
1
Handle
10
1
Hanger
11
1
Transformer
12
1
Primary lead
13
1
Secondary lead
14
1
Auxiliary lead
3.4.1 Details of components.
3.4.1.1 Housing. The optical system shall be enclosed in a dustproof housing fabricated
of aluminum. The housing shall be rigid and strong enough to protect and support components
mounted on or within the housing. Housing dimensions shall be as specified in 3.7.
3.4.1.2 Principal reflector. The principal reflector shall be parabolic precision mirror of
silver-backed glass. The silver coating shall be protected by backing material and coats of paint.
The reflector shall be so mounted that it is not subjected to undue strains and is protected from
contact with metal.
3.4.1.3 Auxiliary reflector. A metal spherical reflector shall be so mounted in the light
that the focus of the spherical reflector falls on the axis of the lamp. The overall diameter and
the position of the spherical reflector and mounting shall be such that no direct light from the
lamp is emitted. The spherical reflector shall be no longer than necessary to prevent emission of
direct light.
3.4.1.4 Lamp. The light shall use a 50 candelas, 6-8V, RP-11 clear bulb, C-6 filament,
200-hour life, 7/8-inch light center length, 2-1/4-inch maximum overall length, single-contact
prefocused base lamp, American Standards Association Trade No. 1501. The lamp shall be
accurately positioned at the focus of the principal reflector and securely held in the light by a
socket of the prefocus type. Unless otherwise specified, the lamp shall be installed and furnished
with the light.
3.4.1.5 Colored filters. The light shall be provided with one aviation red and one
aviation green color filter. The filters shall be of class B, heat-resistant glass in accordance with
MIL-DTL-7989. The color transmission of the filters shall be type I, grade A, in accordance
with SAE AS25050. The filters shall be correctly positioned and firmly held in the light by a
4
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