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 https:/assist.daps.dla.mil/. AMSC N/A FSC 6230 INCH-POUND MIL-DTL-16938D 22 April 2010 SUPERSEDING MIL-S-16938C 30 July 1973 DETAIL SPECIFCATION SEARCHLIGHTS, INCANDESCENT, SIGNALING, 8-INCH This specification is approved for use by all Departments and Agenc
3、ies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers 8-inch incandescent signaling searchlights for Naval shipboard use. 1.2 Classification. The searchlights are of the following types as specified below (see 6.2). 1.2.1 Type. The types of searchlights are as follows: Type
4、 I - 115 volts, 60 hertz (Hz), alternating current (AC) (symbol No. 297) Type II - 28 volts, 60 Hz, AC/direct current (DC) (symbol No. 297.1) 1.3 Part or identifying number (PIN). The PIN to be used for searchlights acquired to this specification is created as follows: M 16938 - X Type: 1 - I - 115
5、volts, 60 Hz, AC (symbol No. 297) 2 - II - 28 volts, 60 Hz, AC/DC (symbol No. 297.1) Specification number Denotes military specification Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-16938D 2 2. APPLICABLE DOCUMENTS 2.1 General. The documen
6、ts listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents 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,
7、 document users are cautioned that they must meet all specified requirements of the documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications and standards. The following specifications and standards form a part of this
8、document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. FEDERAL SPECIFICATION TT-P-645 - Primer, Paint, Zinc-Molybdate, Alkyd Type FEDERAL STANDARDS FED-STD-3 - Colors, Aeronautical Lighting FED-STD-H28 - Scr
9、ew-Thread Standards for Federal Services DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-S-901 - Shock Tests, H.I. (High-Impact) Shipboard Machinery, Equipment, and Systems, Requirements for MIL-E-917 - Electric Power Equipment Basic Requirements MIL-DTL-15024 - Plates, Tags, and Bands for Identification o
10、f Equipment, General Specification for MIL-P-15024/5 - Plates, Identification MIL-PRF-24635 - Coating Systems, Weather-Resistant, Exterior Use MIL-PRF-24712 - Coatings, Powder (Metric) MIL-DTL-24784 - Manuals, Technical: General Acquisition and Development Requirements, General Specification for MIL
11、-DTL-24784/7 - Technical Repair Standards (TRS) for Hull, Mechanical, and Electrical (HM Hull, Mechanical, and Electrical (HM Electronic Including Service Test Electronic, Experimental Electronic and Interior Communication (IC) System and Equipment Manuals; and Weapon Systems and Weapon Equipment Ma
12、nuals MS25242 - Lamp, Incandescent, Par-64 Bulb, Screw Terminal Base DEPARTMENT OF DEFENSE STANDARD MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment (Type I - Environmental and Type II - Internally Excited) (Copies of these documents are available online at https:/assist.daps.dla.mil/ or
13、 from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.3 Non-government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cite
14、d in the solicitation or contract. ASME INTERNATIONAL ASME Y14.24 - Types and Applications of Engineering Drawings ASME Y14.34 - Associated Lists ASME Y14.35M - Revision of Engineering Drawings and Associated Documents ASME Y14.100 - Engineering Drawing Practices (Copies of these documents are avail
15、able online at http:/www.asme.org/ or from ASME International, Three Park Avenue, New York, NY 10016-5990.) AMERICAN SOCIETY FOR QUALITY (ASQ) ASQ Z1.4 - Sampling Procedures and Tables for Inspection by Attributes (Copies of this document are available online at http:/www.asq.org/ or from American S
16、ociety of Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-16938D 4 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the t
17、ext of this 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 b
18、e subjected to first article inspection and testing in accordance with 4.2 and 6.4. Production shall not be started until the contractor has furnished evidence that the sample has passed the first article tests. 3.2 General requirements. 3.2.1 Material. Material shall be as specified herein or shall
19、 meet the performance requirements as specified herein. 3.2.2 Metals. Metals shall be nonmagnetic material and shall have a permeability of 2.0 or less after fabrication. All materials used shall be corrosion resistant. 3.2.3 Design. The signaling searchlight shall be designed in general conformance
20、 with figures 1 and 2. It shall be a device which produces a relatively narrow beam of light for use as a searchlight or for visual communication when the light beam is mechanically interrupted by means of a shutter mechanism. The device shall be suitable for use as a portable searchlight or for mou
21、nting on an adjustable mounting stand, and shall include suitable means for sighting and hand training the light beam on the desired target. The searchlight shall consist of the following assemblies: a. Filter and cover frame. b. Shutter. c. Backshell. d. Mounting. e. Lamp. 3.2.4 Construction. The s
22、earchlight shall be constructed for long service, without frequent overhaul, under severe conditions of shock, vibration, temperature, humidity, and salt atmosphere. The construction shall be simple and sturdy, and be such that the continued operation and ordinary maintenance in service do not requi
23、re special tools or excessively precise workmanship. Special tools are defined as those tools not listed in the Federal Supply Catalog. 3.2.5 Painting of searchlight equipment. Prior to painting, all metal surfaces shall be thoroughly cleaned in accordance with MIL-E-917 and given a corrosion-resist
24、ant treatment for the application of the paint finish specified herein. Metal surfaces shall be given two coats of zinc-chromate primer conforming to TT-P-645. The first priming coat shall be applied after all machine work has been completed and after all surfaces to be covered have been thoroughly
25、cleaned and dried. The priming coats shall be followed by two coats of paint as specified in Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-16938D 5 3.2.5.1. A powder coating using Rohm Haas Powder Coating, Corvel Grey, Polyester, 30-7241 or
26、 30-7186, in accordance with MIL-PRF-24712, may be used instead of paint. 3.2.5.1 External surfaces. Painting of external surfaces shall conform to the color, gloss, flexibility, resistance to water immersion, and reflectance of Navy Haze Gray No. 27 (26270) in accordance with MIL-PRF-24635. The pai
27、nt shall not discolor or become soft when the searchlight is operated at rated voltage for a period of 2 hours with the shutter closed. Internal surfaces shall be painted a dull black, unless surface has power coating. 3.3 Interchangeability. All similar parts, including repair parts, of correspondi
28、ng apparatus furnished on the same order or built to the same manufacturers drawings shall be strictly interchangeable without the necessity of further machining or hand fitting of any kind. 3.4 Threaded parts. Screw threads shall conform to the requirements in FED-STD-H28. 3.5 Detail requirements.
29、3.5.1 Light tightness. The searchlight shall be light tight when the lamp is energized, the shutter closed or open, and the front glass covered (no light shall be visible at any time from any part of the searchlight from a distance of 100 feet). 3.5.2 Waterproofness. The construction of the searchli
30、ght shall be such that no water that might interfere with the operation of the searchlight shall enter when the searchlight is subjected to the test specified in 4.6.2. 3.5.3 Shockproofness. The searchlight, less the lamp, shall be so designed as to withstand high impact shock as specified in MIL-S-
31、901 without the fracturing or deformation of any parts of the assembly when tested as specified in 4.6.3. 3.5.4 Vibration proofness. The searchlight shall be designed to operate during vibration tests specified in 4.6.4. All fasteners (bolts, screws, screw clamps, rivets, ect.) shall remain tight an
32、d rigidly fixed and no damage shall be sustained by the assembly or its components. 3.5.5 Corrosion resistance. The searchlight shall not be impaired when tested as specified in 4.6.5. 3.5.6 Insulation resistance. The insulation resistance between all current-carrying and non-current-carrying parts
33、shall be not less than 1 megohm (see 4.6.6). 3.5.7 Dielectric strength. There shall be no evidence of breakdown when the searchlight is subjected to the dielectric test specified in 4.6.6. 3.5.8 Safety. Particular care shall be taken in the design and construction of the searchlight to insure safety
34、 of the operating personnel from the dangers of electric shock and of contact with high temperatures. Effective electric grounding of the assembly shall be maintained as all times to prevent electric shock to personnel in contact with any parts of the unit.Provided by IHSNot for ResaleNo reproductio
35、n or networking permitted without license from IHS-,-,-MIL-DTL-16938D 6 3.5.8.1 Electric shock. Means shall be provided for automatically de-energizing the lamp terminals when the searchlight is opened for re-lamping. 3.5.8.2 High temperatures. Points, which may at any time become hot enough to caus
36、e personal injury, shall be heat insulated or the temperature shall be maintained below 131 F (55 C) assuming an ambient temperature of 77 F (25 C). 3.6 Performance. The searchlight with the signaling shutter shall be capable of manually transmitting messages at speeds up to 15 words (300 operating
37、cycles of the shutter) per minute. The beam spread shall not be less than 8 degrees horizontal by 7 degrees vertical. 3.6.1 Inclination. The searchlight shall be designed to provide for vertical adjustment of the beam axis of at least 60 degrees above and 45 degrees below the horizontal plane, and f
38、or turning the searchlight through a horizontal angle of at least 360 degrees. There shall be adjustments for securing the searchlight in all positions. 3.6.2 Operation. The searchlight shall give no indication of electrical or mechanical faults when tested in accordance with 4.6.9. 3.7 Component pa
39、rts. The following assemblies of the searchlight shall be constructed so that the fitting dimensions insure interchangeability with the corresponding assemblies of any searchlight furnished under this specification, without further machining or hand fitting of any kind. 3.7.1 Filter frame. The filte
40、r frame assembly shall conform to figure 3 and shall support the glass filter. The filter frame shall be easily attached and detached from the cover frame without the use of tools. Three filter frames, each containing one glass filter of the following color and grade of glass in accordance with FED-
41、STD-3 shall be furnished: a. Aviation green, grade D. b. Signal red, grade A. c. Aviation yellow, grade B. The glass shall be able to withstand a 1 foot-pound impact blow (see 4.6.3.1). 3.7.2 Cover frame. The cover frame shall conform to figure 4. The cover frame shall be capable of securing the cov
42、er glass to the shutter housing, and for supporting the filter frame. A locking device shall be employed to secure the filter frame to the cover frame. 3.7.2.1 Cover glass. The cover glass shall be flat and not less than 3/16 inch thick. It shall be made of clear glass, free from bubbles, striae, ch
43、ecks, wrinkles, or other defects and blemishes, and shall be tempered for heat and shock resistance. 3.7.3 Shutter. The shutter assembly shall consist of a metal housing containing the shutter blades and their operating mechanism. The shutter assembly when installed, but fully opened, shall not redu
44、ce the peak beam candle power more than 25 percent. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-16938D 7 3.7.3.1 Shutter housing. The housing shall conform to figure 5 and shall independently retain the shutter and shutter operating mecha
45、nism. The back end of the housing shall fit tightly to the gasketed lamp and backshell to form a watertight seal. Means shall be provided to insure proper alignment between the backshell, lamp gasket, and shutter housing. The housing shall be clamped to the backshell by means of a circular clamp rin
46、g with a quick release toggle lever for ease of lamp replacement (see figure 6). The front end of the housing shall be sealed with the cover frame and glass. Means shall be provided on the outside of the housing for supporting the searchlight in it mounting assembly. 3.7.3.2 Sight. A simple “V“ notc
47、hed type rear sight and bead front sight shall be mounted on the shutter housing between the operating levers. 3.7.3.3 Shutter operating mechanism. The shutter shall be operated by a small, finger-operated lever conforming to figure 7. The design shall be such that the shutter shall be completely op
48、ened from its closed position by the moving of the operating point of the trigger approximately 45 degrees in a downward-backward motion and employing a torque of 1.5 inch-pounds. The shutter shall have a spring return, automatically forcing the shutter to its closed position when the operating leve
49、r is released. 3.7.3.4 Adjustments. One lever shall be located on each side of the shutter housing, and the levers shall be interconnected through the operating mechanism. A method shall be provided to adjust the tension of the return springs. Stops shall be provided for both levers to avoid twisting of the drive shaft beyond the open position of the shutter. One of the levers shall be provided with an easily manipulated locking device
