1、Comments, suggestions, or questions on this document should be addressed to Defense Logistics Agency Aviation 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 informat
2、ion using the ASSIST database at https:/assist.daps.dla.mil/. AMSC N/A FSC 6685 INCH-POUND MIL-DTL-6508C 9 August 2011 SUPERSEDING MIL-T-6508B 25 July 1961 DETAIL SPECIFICATION THERMOMETER, SELF-INDICATING, BIMETALLIC, GENERAL SPECIFICATION FOR Inactive for new design after 26 March 1999. This speci
3、fication is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers design requirements and all performance requirements for the procurement of one type of aircraft bimetallic self-indicating thermometer. 1.2 Classification. The th
4、ermometers are classified by the following part numbers (see 6.2): a. MS28028-1 - Luminescent dial markings b. MS28028-2 - Lusterless white dial markings 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section do
5、es 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, document users are cautioned that they must meet all specified requirements of the documents cite
6、d in sections 3 and 4 of this specification, whether or not they are listed. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-6508C 2 2.2 Government documents. 2.2.1 Specifications and standards. The following specifications and standards form
7、 a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. FEDERAL SPECIFICATION HH-G-156 - Gasket Material, General Purpose, Rubber Sheets, Strips, and Special Shapes FEDERAL STANDARDS FED-STD-5
8、95/37038 - Miscellaneous, Flat or Lusterless FED-STD-595/37875 - Miscellaneous, Flat or Lusterless DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-5541 - Chemical Conversion Coatings on Aluminum and Aluminum Alloys MIL-A-8625 - Anodic Coatings for Aluminum and Aluminum Alloys MS28028 - Thermometer Self
9、-Indicating, Bimetallic MS33558 - Numerals and Letters, Aircraft Instrument Dial, Standard Form of DEPARTMENT OF DEFENSE STANDARDS MIL-STD-130 - Identification Marking of U.S. Military Property MIL-STD-889 - Dissimilar Metals (Copies of these documents are available online at https:/assist.daps.dla.
10、mil/ or 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 tho
11、se cited in the solicitation or contract. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-6508C 3 AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) ASME Y14.100 - Engineering Drawing Properties (Copies of this document are available online at h
12、ttp:/www.asme.org/ or from ASME, Three Park Avenue, New York, NY 10016-5990.) ASTM INTERNATIONAL ASTM E171 - Standard Specification for Standard Atmospheres for Conditioning and Testing Flexible Barrier Materials (Copies of this document are available online at http:/www.astm.org/ or from ASTM Inter
13、national, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959.) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein (except for related specification sheet), the tex
14、t 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 Specification sheet. The individual item requirements shall be as specified herein and in accordance with the applicab
15、le specification sheet. In the event of any conflict between the requirements of this specification and the specification sheet, the latter shall govern. 3.2 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.2. 3.3 Commercial parts.
16、 Commercial parts having suitable properties may be used where, on the date of invitation for bids, there are no suitable standard parts available. In any case, commercial utility parts, such as screws, bolts, nuts, and cotter pins, having suitable properties, may be used provided: a. They can be re
17、placed by the standard parts (MS or AN) without alteration. b. The corresponding standard part numbers are referenced in the parts list and, if practicable, on the contractors drawings. 3.4 Standard parts. With the exception of 3.3, MS and AN standard parts shall be used where they suit the purpose.
18、 They shall be identified on the drawings by their part numbers. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-6508C 4 3.5 Materials. Materials shall conform to applicable specifications and shall be as specified herein. Materials for which
19、 there are no applicable specifications or which are not specifically described herein, shall be of the best quality, of the lightest practicable weight, and suitable for the purpose intended. 3.5.1 Critical materials. Noncritical materials shall be used where practicable. Where the use of a critica
20、l material is essential to meet specification requirements, the material used shall be the least critical of those that are adequate for the purpose. 3.5.2 Metals. Metals shall be of the corrosion-resistant type, or shall be suitably protected as specified herein to resist corrosion due to salt spra
21、y or atmospheric conditions to which the instrument may be subject when in storage or during normal service life. 3.5.2.1 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar metals as defined in MIL-STD-889 shall not be used in intimate contact with each other. 3.
22、5.3 Nonmagnetic materials. Nonmagnetic materials shall be used for all parts of the instrument except where magnetic materials are essential. 3.5.4 Fungus-proof materials. Materials that are nutrients for fungi shall not be used where it is practicable to avoid them. Where used and not hermetically
23、sealed, they shall be treated with a fungicidal agent acceptable to the procuring activity. 3.6 Design and construction. The thermometer shall be designed for use on aircraft to indicate the free air temperature and shall conform to MS28028. The thermometer shall be constructed to withstand the norm
24、al strains, jars, vibrations, and such other conditions as are incident to shipping, storage, installation and service. 3.6.1 Maintenance. The design shall be such as to facilitate as much as possible disassembly, repair or overhaul, service maintenance, and reassembly by those tools and items of ma
25、intenance equipment that are normally available as commercial standards. 3.6.2 Components. The thermometer shall consist of two mounting grommets, one dished washer, one sunshield, and a thermometer assembly. 3.6.3 Washers and grommets. Washers and grommets shall conform to the dimensions shown on M
26、S28028. The mounting grommet shall be constructed from black molded gasket rubber in accordance with HH-G-156, type II, grade A. The dished washer shall be fabricated of a suitable metal. 3.6.4 Seal. The seal of the case and stem of the thermometer shall be waterproof. 3.6.5 Stem. The stem and threa
27、ded boss of the thermometer shall be constructed from hard-drawn stainless steel. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-6508C 5 3.6.6 Pointer. The pointer shall be as light as practicable, and sufficiently rigid to prevent oscillati
28、on under vibration in excess of the requirements specified herein. Pointer stops shall not be used. The pointer shall conform to figure 1. The length of the pointer shall be sufficient to provide 1/3 to 2/3 overlap of the 2-degree graduations. 3.6.7 Dial. The dial shall conform to figure 1, and shal
29、l be securely fastened to the case or frame of the mechanism in such a manner that it will not loosen or turn when the thermometer is vibrated. The scale arc of the dial shall be not less than 310 degrees. 3.6.7.1 Dial markings. Dial markings shall be durable and in accordance with figure 1. The sty
30、le and proportions of the letters and numerals placed on the dial shall conform to MS33558. The dimensions of dial markings and the type of paint used shall be as shown in figure 1. The lusterless white shall be in accordance with FED-STD-595/37875. The lusterless black shall be in accordance with F
31、ED-STD-595/37038. 3.6.7.2 Numerals. Numerals shall distinctly indicate the graduation to which each applies. If practicable, each numeral shall be placed so that the center of mass of the numeral is on the radial line joining the appropriate graduations and the center of the dial. Any confusion resu
32、lting in doubt as to which graduation the numeral applies shall be cause for rejection. When several numerals are used in one group, the space between the numerals shall not be less than 0.016 inch. 3.6.8 Cover glass. The cover glass shall be clear and free from flaws. 3.6.9 Dial to cover glass dist
33、ance. The distance between the dial and cover glass shall be 0.125 +0.025/-0.015 inch, when measured at the graduations on the dial. 3.6.10 Parallax. To avoid parallax, the pointer shall be reasonably close to the dial without interfering with the action of the thermometer. The distance between the
34、dial and pointer shall be not greater than 0.10 inch. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-6508C 6 Marking Height or length (0.016) Width or line graduation (0.005) Material or finish Numerals 0.125 0.020 Lusterless white or fluore
35、scent luminescent material Graduations at 10-degree divisions 0.156 0.020 Pointer (shaded part) As shown - Graduations at 2-degree divisions 0.094 0.015 Lettering (FREE AIR, C) 0.094 0.015 Background of dial - - Lusterless black MS PART NO. 0.094 - Pointer (unshaded part) As shown - NOTES: 1. Dimens
36、ions are in inches. 2. Unless otherwise shown, all tolerances are 0.010. 3. All dial graduations are partial radial lines. 4. Numerals and letters shall be in accordance with MS33558. 5. Pointer dimensional limits are in accordance with 3.6.6. FIGURE 1. Dial. Provided by IHSNot for ResaleNo reproduc
37、tion or networking permitted without license from IHS-,-,-MIL-DTL-6508C 7 3.7 Finish. Protective coatings and finishes which will crack, chip or scale during normal service life or due to extremes of atmospheric conditions shall not be used. 3.7.1 Aluminum alloy parts. Where practicable, aluminum al
38、loy parts shall be covered with an anodic film conforming to MIL-A-8625. If the dial consists of aluminum alloy, then small holes and case inserts need not be anodized. Aluminum alloys that do not anodize satisfactorily shall be coated with chemical film in accordance with MIL-DTL-5541. 3.7.2 Case f
39、ront. The front of the thermometer case shall be finished in a durable lusterless black. 3.7.3 Stem. The thermometer stem shall have a bright natural metal finish. 3.7.4 Sunshield. The outer surface of the sunshield shall be a highly polished metal finish. 3.8 Weight. The weight of the complete inst
40、rument shall not exceed 0.18 pound. 3.9 Performance. The thermometer shall perform satisfactorily when subjected to the tests specified in Section 4. 3.10 Workmanship. The thermometer, including all parts and accessories, shall be constructed and finished to produce an instrument free from all defec
41、ts that would affect proper functioning in service. Particular attention shall be given to freedom from blemishes, defects, burrs, sharp edges, accuracy of dimensions, and marking of parts and assemblies. 3.11 Identification of product. A nameplate or self-adhesive metallic label shall be securely a
42、ttached to the exterior of the case and shall be legibly and durably marked in accordance with MIL-STD-130. 3.11.1 Manufactures part number. The manufactures part number marked in the space provided on the nameplate shall be identical with the manufacturers engineering production drawing number, inc
43、luding applicable dash numbers, if the drawing is tabulated and covers more than one part. 3.11.2 Interchangeability. All parts having the same manufacturers part number shall be functionally and dimensionally interchangeable. The drawing number requirements of ASME Y14.100, numbering, coding, and i
44、dentification section, shall govern changes in the manufacturers part numbers. 3.12 Installation instruction. The contractor shall furnish with each thermometer one copy of the installation instructions with illustrations and diagrams. Prior to printing, two copies shall be furnished to the procurin
45、g activity for approval. The instructions shall be printed on 8.5 by 11 or 11 by 17-inch paper. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-6508C 8 3.12.1 Envelope. An envelope, furnished by the contractor and containing installation inst
46、ructions, shall be packaged with each thermometer and shall be marked with the following information: 3.13 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the mater
47、ial meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First article inspection (see 4.2). b. Conformance
48、 inspection (see 4.3). 4.2 First article inspection. First article inspection shall consist of all the inspections and tests of this specification performed in the order specified in table I. TABLE I. First article and conformance inspections. Inspections and tests First article inspection Conforman
49、ce inspection Paragraph Inspection X Individual test 4.5.1 Scale error X Individual test 4.5.2 Position error X Individual test 4.5.3 Drift X Sampling test 4.5.4 Durability X Sampling test 4.5.5 Response time (lag) X Sampling test 4.5.6 Sealing X Sampling test 4.5.7 Vibration X Sampling test 4.5.8 Altitude X - 4.5.9 Thermal conductivity X - 4.5.10 Vibration endurance X - 4.5.11
