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 6610 INCH-POUND MIL-DTL-7627G 24 August 2010 SUPERSEDING MIL-I-7627F 15 November 1994 DETAIL SPECIFICATION INDICATOR, TURN AND SLIP, 28V DC Inactive for new design after 1 April 1996. This specification is approved for use by
3、 all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers 28V DC, hermetically sealed turn and slip indicators. 1.2 Classification. The indicators are of the following types, as specified (see 6.2). MS28041-1 - 4 Minute Turn, Dark Ball, Fluorescent Dia
4、l Marking MS28041-1A - 4 Minute Turn, White Ball, Lusterless White Dial Marking MS28041-1B - 4 Minute Turn, Dark Ball, Lusterless White Dial Marking MS28041-1C - 4 Minute Turn, Dark Ball, Fluorescent Dial Marking MS28041-1D - 4 Minute Turn, Dark Ball, Lusterless White Dial Marking MS28041-2 - 2 Minu
5、te Turn, Dark Ball, Lusterless White Dial Marking MS28041-2A - 2 Minute Turn, White Ball, Fluorescent Dial Marking 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 documents cited in other
6、 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 and 4 of this specifica
7、tion, whether or not they are listed. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7627G 2 2.2 Government documents. 2.2.1 Specifications, standards, and handbook. The following specifications, standards and handbook form a part of this do
8、cument to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. FEDERAL STANDARDS FED-STD-595/15044 - Blue, Gloss FED-STD-595/17038 - Miscellaneous, Gloss FED-STD-595/37038 - Miscellaneous, Flat or Lusterless FED-STD-5
9、95/37875 - Miscellaneous, Flat or Lusterless COMMERCIAL ITEM DESCRIPTION A-A-59503 - Nitrogen, Technical DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-N-3336 - Nut, Sheet Spring, Instrument Mounting MIL-E-5400 - Electronic Equipment, Aerospace, General Specification for MIL-DTL-5541 - Chemical Conversion
10、 Coatings on Aluminum and Aluminum Alloys MIL-A-8625 - Anodic Coatings for Aluminum and Aluminum Alloys MIL-P-23408 - Plating: Tin-Cadmium (Electrodeposited) MS28041 - Indicator, Turn and Slip, 28V DC, 1-7/8 Inch Dial MS33558 - Numerals and Letters, Aircraft Instrument Dial, Standard Form of MS33638
11、 - Cases, Instrument, Flange Mounted, Aircraft MIL-B-81793 - Bearings, Ball, Annular for Instruments and Precision Rotating Components MIL-DTL-83488 - Coating, Aluminum, High Purity DEPARTMENT OF DEFENSE STANDARDS MIL-STD-130 - Identification Marking of U.S. Military Property MIL-STD-461 - Requireme
12、nts for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipment MIL-STD-704 - Aircraft Electric Power Characteristics MIL-STD-810 - Environmental Engineering Considerations and Laboratory Tests MIL-STD-889 - Dissimilar Metals Provided by IHSNot for ResaleNo reproducti
13、on or networking permitted without license from IHS-,-,-MIL-DTL-7627G 3 DEPARTMENT OF DEFENSE HANDBOOK MIL-HDBK-781 - Handbook for Reliability Test Methods, Plans, and Environments for Engineering, Development Qualification, and Production (Copies of these documents are available online at https:/as
14、sist.daps.dla.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 doc
15、uments are those cited in the solicitation or contract. AMERICAN WELDING SOCIETY AWS B2.3/B2.3M - Specification for Soldering Procedure and Performance Qualification (Copies of this document are available from http:/www.aws.org/ or from American Welding Society, 550 N.W. LeJeune Road, Miami, FL 3312
16、6.) SAE INTERNATIONAL SAE AMS-M-3171 - Magnesium Alloy, Processes for Pretreatment and Prevention of Corrosion on SAE AS8879 - Screw Threads - UNJ Profile, Inch Controlled Radius Root with Increased Minor Diameter SAE AS50881 - Wiring Aerospace Vehicle (Copies of these documents are available from h
17、ttp:/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 this document and the references cited herein (except for related specification s
18、heet), 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 Specification sheet. The individual item requirements shall be as specified herein and in accordance wit
19、h the applicable specification sheet. In the event of any conflict between the requirements of this specification and the specification sheet, the latter shall govern. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7627G 4 3.2 First article.
20、 When specified (see 6.3), a sample shall be subjected to first article inspection in accordance with 4.3. 3.3 Parts and materials. In the selection of parts and materials, fulfillment of major design objectives shall be the prime consideration. In so doing, the following shall govern: a. Parts and
21、materials requirements shall conform to MIL-E-5400. b. Non-repairable subassemblies, as outlined in MIL-E-5400, shall be used when practicable. The general size of subassembly and the amount of circuitry to be included therein shall be approved by the procuring activity. Non-repairable subassemblies
22、 must be reliable (see 6.6). c. Bearing selection will conform to MIL-B-81793. 3.3.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds t
23、he operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.4 Design and construction. The indicator shall conform to all applicable requirements of MIL-E-5400 for design, construction, and workmanship, except as otherwise specified herein. 3.4.1 Total wei
24、ght. The total weight of the indicator, less mounting screws, shall not exceed 2 pounds. 3.4.2 Reliability. 3.4.2.1 Operational stability. The indicator shall operate with satisfactory performance, continuously or intermittently for a period of at least 2,500 hours without the necessity for an adjus
25、tment. 3.4.2.2 Operating life. The indicator shall have a minimum total operating life of 25,000 hours. Parts requiring scheduled replacement due to wear during the life of the indicator, and the wear-out life of such parts, shall be determined by the contractor and submitted to the procuring activi
26、ty. 3.4.2.3 Reliability in mean-time-between-failures (MTBF). For the test program under 4.5.24, the specified mean operating time between failures shall be 2,000 hours. For this test program, a failure shall be considered to have occurred whenever the performance characteristics fall below the acce
27、ptance requirements (4.5.24.4) irrespective of whether or not the condition can be corrected by adjustment of operator controls. 3.3.3 Cabling and connections. 3.4.3.1 Cables and connectors. The indicator shall provide for the use of cables and connectors in accordance with MIL-E-5400. Provided by I
28、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7627G 5 3.4.3.2 Interconnection cabling. The indicator shall be capable of satisfactory operation using external wiring in accordance with the application requirements of SAE AS50881. The external wiring sha
29、ll be unshielded, except that a minimum number of the individual wires may be shielded when demonstrated as necessary to meet interference control requirements and provided the assembly of the cable to its plugs may be easily accomplished. External cables and that portion of the connectors attached
30、to the cables shall not be supplied as part of the indicator. 3.4.4 Interchangeability. The indicator shall meet the interchangeability requirements as defined in MIL-E-5400. 3.4.5 Electromagnetic interference (EMI). The indicator shall meet the EMI requirements of MIL-STD-461. 3.4.6 Maintenance pro
31、visions and field-testing. Provisions for maintenance shall be as specified in MIL-E-5400. Specific test points and test facilities shall be provided to the greatest extent practicable for ease of field-testing and maintenance. 3.4.7 Nameplate. A nameplate shall be securely attached to the exterior
32、of the case and shall be marked in accordance with MIL-STD-130, except that the National Stock Number marking shall be omitted. 3.4.8 Standard conditions. The following conditions, unless otherwise specified, shall be used to establish normal performance characteristics under standard conditions and
33、 for making laboratory bench tests. Temperature Room ambient (77 9 F (25 5 C) Altitude Normal ground Vibration None Humidity Room ambient up to 90 percent relative humidity Input power voltage 27.5 0.5V DC 3.4.9 Environmental conditions. The indicator shall be capable of withstanding the following e
34、nvironmental conditions as required in section 4 herein: a. Operating temperature. Continuous operation over a temperature range of -65 F (-54 C) to 160 F (71 C). b. Exposure temperature. Exposure temperature from -80 F (-62 C) to 203 F (95 C). c. Temperature-altitude. 0 to 70,000 feet. d. Temperatu
35、re shock. MIL-STD-810, method 503, procedure I-C. Constant extreme temperature shall be from -70 F (-57 C) to 160 F (71 C), with each duration of exposure to be not less than 4 hours. e. Salt fog. Exposure to salt laden atmosphere. f. Fungus. Fungus growth as encountered in a tropical climate. g. Ac
36、celeration. MIL-STD-810, method 513, procedure I. h. Vibration. MIL-STD-810, method 514, transportation categories 7 and 8, procedure 1. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7627G 6 3.4.10 Primary input power requirements. The indi
37、cator shall meet all applicable requirements of MIL-STD-704 and shall give specified performance from a 28V DC, 0.25 amp power source with characteristics as defined in MIL-STD-704 having limits as specified therein. The power required shall not exceed the specified amounts. 3.4.11 Transportability.
38、 The indicator shall be so constructed that no parts will work loose in service. It shall be built to withstand the strains, jars, vibration, and other conditions incident to shipment, storage, installation and service use. 3.5 Performance. Unless otherwise specified, values set forth to establish t
39、he requirements for satisfactory performance apply to performance under both standard and extreme service conditions. When reduced performance under the extreme conditions is acceptable, tolerances or values setting forth acceptable variations from the performance under the standard conditions will
40、be specified. 3.6 Details requirements. 3.6.1 Maintenance. The design shall be reasonably simple to facilitate as much as possible disassembly, repair or overhaul, service maintenance, and reassembly using tools and items of maintenance equipment which are normally available as commercial standards.
41、 3.6.2 Case. The case shall conform to MS33638 with the length as specified in MS28041. The case and mounting flange shall be made of nonferrous, low-density metal, uniform in texture, having a smooth surface and shall be hermetically sealed. The case shall be finished with a lusterless black materi
42、al in accordance with FED-STD-595/37038. The finishing material shall be of a durable type to withstand usage encountered in service. 3.6.2.1 Hermetic sealing. The case shall provide a hermetically sealed enclosure for all of the mechanism. The case shall be so constructed that it may be opened, the
43、 mechanism removed and replaced, and the case resealed at least three times. This shall be possible without the use of any special tool, jig, or fixture, unless such device is specifically approved by the procuring activity. The sealing of the case shall not be dependent upon any material that may b
44、e adversely affected by any atmosphere to which the instrument may be subjected in normal use in military aircraft. 3.6.2.2 Filling medium. The filling medium shall be a mixture of 90 percent nitrogen and 10 percent helium. The nitrogen used shall be in accordance with A-A-59503, type I, grade B, cl
45、ass 1. The filling medium shall contain not more than 0.006 milligram of water vapor per liter (dew point -85 F (-65 C) at the filling pressure. The absolute pressure of the filling medium in the case shall be 1 0.1 atmosphere. 3.6.2.3 Reinforcement. The inside of the case around each connection sha
46、ll be of sufficient strength to prevent damage to the case when the connections are tightened during installation of the indicator. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7627G 7 3.6.2.4 Cover glass. The cover glass shall be clear, f
47、lat, and free from flaws that interfere with the normal reading of the instrument. The glass shall not be fluorescent when exposed to ultraviolet light or rays in the 365 millimicrons region. 3.6.2.4.1 Dial to cover glass distance. The distance between the indicator dial and the inside of the cover
48、glass shall be held to a minimum and shall not exceed 0.188 inch. 3.6.3 Dial. The dial shall conform to figure 1. All markings shall be durable to withstand the usage encountered in service, and be finished in fluorescent luminescent or lusterless white conforming to FED-STD-595/37875, and in luster
49、less black conforming to FED-STD-595/37038. The style and proportions of numerals and letters placed on the dial shall conform to MS33558. 3.6.3.1 Visibility of dial. The pointed, center mark and all other specified markings on the dial shall be visible from any point within the frustum of a cone whose side makes an angle of 30 degrees with a perpendicular to the dial and whose small diameter is
