1、Comments, suggestions, or questions on this document should be addressed to Defense Supply Center Richmond, ATTN: DSCR-VEB, 8000 Jefferson Davis Highway, Richmond, VA 23297-5616, or e-mailed to STDZNMGTdla.mil. Since contact information can change, you may want to verify the currency of this address
2、 information using the ASSIST database at http:/assist.daps.dla.mil/. AMSC N/A FSC 6210 INCH-POUND MIL-DTL-25971C 7 January 2009 SUPERSEDING MIL-L-25971B 29 May 1967 DETAIL SPECIFICATION LIGHT, AIRPORT TRAFFIC CONTROL, SDU-4/U This specification is approved for use by all Departments and Agencies of
3、 the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers one type of airport traffic control light designated SDU-4/U. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include doc
4、uments cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of the documents cited in sections 3 an
5、d 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these docu
6、ments are those cited in the solicitation or contract. FEDERAL SPECIFICATION W-C-596 - Connector, Electrical, Power, General Specification for Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25971C 2 DEPARTMENT OF DEFENSE SPECIFICATIONS MS310
7、2 - Connector, Receptacle, Electrical, Box Mounting, Solder Contacts, AN Type MIL-DTL-7989 - Covers, Light-Transmitting, for Aeronautical Lights, General Specification for MIL-DTL-14072 - Finishes for Ground Based Electronic Equipment MIL-PRF-24712 - Coatings, Powder (Metric) DEPARTMENT OF DEFENSE S
8、TANDARDS MIL-STD-130 - Identification Marking of U.S. Military Property MIL-STD-810 - Environmental Engineering Considerations and Laboratory Tests MIL-STD-889 - Dissimilar Metals MIL-STD-1916 - DOD Preferred Methods for Acceptance of Product DEPARTMENT OF DEFENSE HANDBOOK MIL-HDBK-831 - Preparation
9、 of Test Reports (Copies of these documents are available online at http:/assist.daps.dla.mil/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other government documents, drawings, and publications. The following other government
10、documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation or contract. FEDERAL AVIATION ADMINISTRATION FAA-E-2214 - Gun, Signal Light, Portable Drawings D-5056-1 - Portable Signal Ligh
11、t Gun, Type W-1 through -12 (Copies of these documents are available from the Federal Aviation Administration, 800 Independence Avenue, SW, Room 700W, AJW-281, Attn: NAS Documentation Control Center (DCC), Washington, D.C. 20591.) 2.3 Non-government publications. The following documents form a part
12、of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. ASME ASME Y14.100 - Engineering Drawing Practices Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
13、,-,-MIL-DTL-25971C 3 (Copies of this document are available online at http:/www.asme.org/ or from ASME, Three Park Avenue, New York, NY 10016-5990.) SAE INTERNATIONAL SAE AS25050 - Colors, Aeronautical Lights and Lighting Equipment, General Requirements for SAE AS5756 - Cable, Power, Electrical, Por
14、table General Specification for (Copies of these documents are available from http:/www.sae.org/ or from SAE International, 400 Commonwealth Drive, Warrendale PA 15096-0001.) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of thi
15、s document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjecte
16、d to first article inspection in accordance with 4.2. 3.2 Materials. 3.2.1 Fungus-proof materials. Materials that are nutrients for fungi shall not be used where it is practical to avoid them. When used and not hermetically sealed, they shall be treated with a fungicidal agent acceptable to the proc
17、uring activity. However, if they will be used in a hermetically sealed enclosure, fungicidal treatment will not be necessary. 3.2.2 Metals. The metals shall be as specified herein. Unless otherwise specified, metals shall be of the corrosion-resistant type or suitably treated to resist corrosion due
18、 to fuels, salt spray, atmospheric conditions or chemical reaction when installed. The use of dissimilar metals shall be avoided where practicable. When used, dissimilar metals shall be in accordance with MIL-STD-889. 3.3 Design and construction. The light shall be designed and constructed in accord
19、ance with FAA Drawings D-5056-1 through -12, and shall provide equivalent performance to the light specified in FAA-E-2214. The light shall be designed to be held, aimed, and operated with one hand. 3.3.1 The light shall be constructed to withstand the strains, jars, vibrations, and other conditions
20、 incident to shipping, storage, installation, and service. The light shall be so constructed that any necessary repairs or maintenance can be readily made by the personnel of operating units or overhaul bases without the use of special tools. Provided by IHSNot for ResaleNo reproduction or networkin
21、g permitted without license from IHS-,-,-MIL-DTL-25971C 4 3.4 Components. The light shall consist of the following major components: Item no. Quantity Description Requirement Paragraph 1 1 Housing 3.4.1.1 2 1 Principal reflector 3.4.1.2 3 1 Auxiliary reflector 3.4.1.3 4 1 Lamp 3.4.1.4 5 2 Colored fi
22、lters 3.4.1.5 6 1 Cover 3.4.1.6 7 1 Color indicator 3.4.1.7 8 1 Sighting device 3.4.1.8 9 1 Handle 3.4.1.9 10 1 Hanger 3.4.1.11 11 1 Transformer 3.4.1.12 12 1 Primary lead 3.4.1.12.2 13 1 Secondary lead 3.4.1.12.3 14 1 Auxiliary lead 3.4.1.13 3.4.1 Details of components. 3.4.1.1 Housing. The optical
23、 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 par
24、abolic 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
25、 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 necess
26、ary 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
27、 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 an
28、d 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 Provid
29、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25971C 5 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
30、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 a
31、ccordance 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 fr
32、ont of the light to redirect a small part of the main beam to the operators 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 indi
33、cating 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 a
34、xis 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. T
35、he 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, unp
36、ressed 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 sh
37、all 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
38、 overhead wire. If a yoke-type hanger or similar device is used, it shall be readily removable from the light. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25971C 6 3.4.1.12 Transformer. A two-coil isolating transformer shall be provided a
39、s a separate unit in order that the light can be operated from a commercial 60-cycle, 120V source. The transformer shall have a minimum rating of 50 va and shall be weatherproof. With 120V, 60-cycle current applied to the primary, and with the specified lamp and lead installed, the transformer shall
40、 supply a voltage of 7 + 0.1V at the lamp. The transformer case shall have at least two holes for 1/4-inch mounting bolts. 3.4.1.12.1 Fuse. A small fuse, enclosed so that it is waterproof, shall be provided in the transformer secondary circuit. The fuse shall be rated at 32V, 10 amp. The fuse shall
41、be easily accessible for changing. 3.4.1.12.2 Primary lead. The primary lead of the transformer shall be 3 feet in length and shall be permanently connected to the transformer. The cable in the lead shall be two-conductor, 16 AWG in accordance with SAE AS5756. The lead shall terminate in a two-pole,
42、 parallel blade, attachment plug cap in accordance with W-C-596. 3.4.1.12.3 Secondary lead. The secondary lead from the transformer to the light shall be 20 feet in length, permanently connected to the transformer and shall terminate in a female angle plug which matches the receptacle on the light.
43、The cable in the lead shall be two-conductor, 16 AWG in accordance with SAE AS5756. 3.4.1.13 Auxiliary lead. An auxiliary lead, 10 feet in length, shall be furnished for emergency operation of the light from a battery. One end of this lead shall terminate in a female angle plug which matches the rec
44、eptacle on the light. At the other end, the cable sheath shall be removed freeing a 12-inch length of the two insulated conductors. Each conductor shall terminate in a spring clip capable of being connected to the terminals of a storage battery. The cable in the lead shall be two-conductor, 16 AWG i
45、n accordance with SAE AS5756. 3.4.1.14 Optical. The optical system shall be of the fixed, prefocus type requiring no focusing by personnel of the operating units. Provisions for making adjustments during manufacture may be used if the adjustments are rigidly locked in place and will not be disturbed
46、 during routine maintenance. All components of the optical system shall be properly braced and supported to prevent their getting out of alignment. 3.4.1.15 Wiring. The light shall be completely wired and ready for operation upon attachment of the poser leads. 3.5 Performance. 3.5.1 Operation. When
47、tested as specified in 4.4.2, the light shall operate satisfactory, all controls shall work freely, and the color filters and color indicator shall be positioned correctly. Any sticking, jamming, or malfunction shall be cause for rejection. 3.5.2 Sights. When tested as specified in 4.4.3, the axis o
48、f the sight shall be no more than 1 foot from the center of the target when the target is at 400 feet, or the equivalent of 1 foot in 400 feet when the target is at another distance. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25971C 7 3.
49、5.3 Focus. When tested as specified in 4.4.4, the center of the image as shown on figure 1 shall have the same spacing as the holes in the screen. 123444123444SECTION IMAGESHOLESA - ASECTION B - B4 1/2 FTC TO BE HORIZONTALLABABUnless otherwise specified, dimensions in inches. FIGURE 1. Focus test. 3.5.4 Photometry. When tested as specified in 4.4.5, the signal beam emitted from the light shall be of a circular cro
