1、MIL-PRF-85725A m 999990b 2065708 957 m * MIL-PRF-S5725A(AS) 20 Mav 1998 SUPERSEDING 25 July 1986 MIL-R-85725(AS) PERFORMANCE SPECIFICATION RACK, INTEGRATED AVIONICS, FORCED AIR COOLED, GENERAL SPECIFICATION FOR This specification is approved for use by the Naval Air Systems Command, Department of th
2、e Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers forced-air-cooled, integrated avionics racks, herein after referred to as racks, used for various military avionics systems. The racks are designed to accommod
3、ate Standard Electronic Modules (SEMS) using multiple tiers. 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 sections of this specification or recommended for add
4、itional 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 ail specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government document
5、s. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Air Warfare Center Aircrafk Division, Code 414100B120-3, Highway 547, Lakehurst, NJ 08733-5100 by using the Standardization Do
6、cument Improvement Proposal D Form 1426) appearing at the end of this document or by letter. AMSC NA FSC 5975 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-57
7、25A 99999Ob 20b5709 893 MIL-PRF-8 5 72 5A( AS) 2.2.1 Soecifications. 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 documents are those listed in the issue of
8、the Department of Deferse Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS DEPARTMENT OF DEFENSE MIL-C-28754 - Connectors, Electrical, Modular, Component Parts, General Specification For MIL-C-3 8999 - Connector, Electrical, C
9、ircular, Miniature, High Density, Quick Disconnect, Bayonet, Threaded, and Breach Coupling, Environment Resistant, Removable Crimp and Hermetic Solder Contacts, General Specification For STANDADS DEPARTMENT OF DEFENSE MIL-STD-130 - Identification Marking of U.S. Military Property MIL-STD-8 1 O - Env
10、ironmental Test Methods and Engineering Guidelines MIL-STD-1377 - Effectiveness of Cable, Connector, and Weapon Enclosure Shielding and Filters in Precluding Hazards of Electromagnetic Radiation to Ordnance; Measurement of MIL-STD-13 89 - Design Requirements for Standard Electronic Modules (Unless o
11、therwise indicated, copies of the above specifications, standards, and handbooks are available from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 191 11-5094.) 2.3 Non-Government publications. The following document forms a part of this document to the ex
12、tent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted are those listed in the issue of the DoDISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS are the issues of the documents cited in the solici
13、tation (see 6.2). AMERICAN SOCIETY FOR QUALITY CONTROL (ASQC) ASQC-Zl.4 - Sampling Procedures and Tables for Inspection by Attributes. OD adopted) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-PRF-85725A = 999990b 2065710 505 (Application for
14、 copies should be addressed to the American Society for Quality Control, 61 1 East Wisconsin Avenue, Milwaukee, WI 53202.) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in thi
15、s 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 subjected to first article inspection in accordance with 4.2. 3.2 Materials. The materials used in the constru
16、ction of racks shall be capable of meeting the performance requirements specified herein (see 3.3.11.2 and 4.5.1). 3.2.1 Corrosion prevention and control. The materials selected shall have corrosion resistance or shall be treated to resist corrosion during service life (see 6.2). 3.2.2 Dissimilar me
17、tals. Where dissimilar metals are used in contact with each other, protection against galvanic corrosion shail be provided. When dissimilar metals are used they shall not be susceptible to galvanic corrosion in accordance with table VI1 of MIL-C-28754. Dissimilar metals such as brass, copper or stee
18、l shall not be used in contact with aluminum or aluminum alloys. 3.2.3 Recycled. recovered. or environmentally preferable materials. Recycled, recovered, or environmentally safe materials shall be used, provided that the material meets the performance requirements specified herein. 3.3 Design. 3.3.1
19、 Modularity. The rack shall accommodate two to seven tiers (see 6.2). Each tier shall be compatible with either Format B span 2, Format C, or Format E modules as specified in MIL-STD-1389. Each tier shall also contain a primary backplane. The individual tiers shall interconnect with a flexible secon
20、dary backplane. Each tier shall: a: Have a primary backplane through which the SEMS are interconnected. b. Have a combination module guide rail and air heat exchanger for module retention and heat dissipation. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license fro
21、m IHS-,-,-. c. Provide module retainer mechanisms to secure the modules firmly in place and provide for thermal contact with the guide rail. d. Be removable as an assembly, complete with module guide rail and heat exchangers, fiom the front of the rack. e. Provide a means to ailow the escape of wate
22、r or other fluids fiom the module equipment. 3.3.2 Backplanes. All electrical connections between modules, tiers, and inputoutput WO) connectors shall be through backplanes. 3.3.2.1 Primary backplane. The primary backplane shall provide the electrical and mechanical interconnection for the modules (
23、see figure 1). 3.3.2.2 Secondary backplane. The secondary backplane shall provide an interconnection medium for rack YO connectors, primary backplanes, and other associated electrical components. 3.3.3 Connectors: Electrical connections shall consist of the connector types specified in 3.3.3.1 and 3
24、.3.3.2. 3.3.3.1 Inputoutput connectors. The rack shall accommodate connectors as specied in MIL-C-38999. Locations shall be provided at the ends which are not plenums of the rack for I/O connector mounting. The I/O connectors and secondary backplane shall be removable fiom the inside of the enclosur
25、e. 3.3.3.2 Secondagdprirnary backplane. An interface connector shall be provided between the primary backplane and secondary backplane for the purpose of situplifiring the removal of an . entire tier. 3.3.4 Mounting and suuuort. Vibration isolators shall be the primary means of support with the exce
26、ption of hard mounting applications when specified in the contract (see 6.2). Resonant frequencies of the rack or any of its components excluding the external isolators shall be not less : than45Hertz(Hz). 3.3.5 Air inlet and outlet. The rack shall accommodate forced-air cooling. Cooling air sha not
27、 enter the module compartments or the compartment containing the primary or secondary backplane. The cooling air shall enter a plenum on one side of the rack, pass through the heat exchangers into the opposite side plenum, and then exhaust out of the rack. Location of the air inlet and exhaust outle
28、t shall be optional, unless otherwise specified in the contract (see 6.2). 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-85725A W 999990b 20b5712 388 3.3.6 Module retainer. The retainer mechanism is permitted to be part of the enclosure o
29、r part of the module. The retainer mechanism shall be capable of securing SEMS firmly in place with a minimum contact pressure of 25 pounds per square inch (psi). This mechanism shall be - shop and depot adjustable or replaceable. The retainers for the Format C or E modules shall not contribute to t
30、he insertion or extraction forces. 3.3.7 Escape of fluids. The enclosure shall contain a means of allowing the escape of fluids, such as drain holes. The rack shall be capable of being mounted in any orientation and shall be designed to avoid any feature which traps water or other fluids. 3.3.8 Heat
31、 exchanger. The heat load shall be removed by the heat exchangers through forced 2.75 inches of water for Format E designs. d. Maximum module guide rib temperature: 85C (185 OF). e. Maximum outlet air temperature: 71C (160 OF). f. The minimum design goal for the air flow rate shall be 3 lb/min-kW of
32、 cooling air. 3.4.4 Electromagnetic interference. 3.44.1 Shielding effectiveness. The rack shall be designed to act as an effective shield against incident electric, magnetic, and electromagnetic field radiation. 3.4.4.1.1 Outside-to-inside. The outside-to-inside shielding effectiveness of the rack
33、shall meet the minimal requirements shown on figure 6 when tested in accordance with 4.5.5.1.1. 3.4.4.1.2 Tier-to-tier. The shielding effectiveness between tiers shall-meet the minimal requirements shown on figure 7 when tested in accordance with 4.5.5.1.2. 3.5 Dimensions. The cooling rack shall be
34、capable of accommodating between 2 and 7 tiers and interfacing with the backplane shown in figure 1 (see 4.5.1). 3.6 Weight. The maximum system mass shall be 14.3 pounddtier for Format B modules, 25.4 pounddtier for Format C modules, and 82.7 pounddtier for Format E modules. The tier mass includes a
35、il the mechanical structure of the tier and dummy modules (see 4.5.1.1). 3.7 w. Each rack and component sha be marked in accordance with MIL-STD-130 in a manner to ensure that the information remains intact and legible throughout the life of the item, and shall be located so that the marking is not
36、obscured (see 6.2). 3.8 Workmanship. Painted surfaces shall be uniformly coated. Metal parts shail be fi-ee of burrs or sharp edges (see 4.5.1). 4. VERIFICATION 4.1 Classification of insPections. The inspection requirements specified herein are classified as follows: a. First article inspection (see
37、 4.2). b. Conformance inspection (see 4.3). 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-85725A 9999906 2065716 T23 MIL-PRF-8 5725A(AS) 4.2 First article inspection. First article inspection shall be performed on two racks when a first a
38、rticle sample is required (see 3.1 and 6.2). This inspection shall consist of the examination and tests listed in table II. TABLE II. First article inspection. Inspection Examination Materials Design Dimensions Weight Marking Workmanship High temperature Low temperature Temperature shock Humidity Fu
39、ngus Acceleration Vibration Shock Crash safety Guide rails Tier insertiodextraction U Pressure drop salt fog Leakage Thermal Shielding outside-to-inside shielding tier-to-tier Requirement paragraph 3.2 3.3 3.5 3.6 3.7 3.8 3.4.1.1 3.4.1.2 3.4.1.3 3.4.1.4 3.4.1.5 3.4.1.6 3.4.1.7 3.4.1.8 3.4.1.9 3.4.1.
40、10 3.4.2.1 3.4.2.2 3.4.2.3 3.4.2.4 3.4.3 3.4.4.1.1 3.4.4.1.2 Method Paragraph 4.5.1 4.5.1 4.5.1 4.5.1.1 4.5.1 4.5.1 4.5.2.1 4.5.2.2 4.5.2.3 4.5.2.4 4.5.2.5 4.5.2.6 4.5.2.7 4.5.2.8 4.5.2.9 4.5.2.10 4.5.3.1 4.5.3.2 4.5.3.3 4.5.3.4 4.5.4 4.5.5.1.1 4.5.5.1.2 - 1/ This test is not applicable for Format E
41、 designs. 4.3 Conformance inspection. Conformance inspection shall consist of Groups A, B, and C inspections. 4.3.1 Group A inspection. Group A inspection shall consist of the examination shown in table III. Group A inspection shall be performed on those samples selected fi-om an inspection lot in a
42、ccordance with ASQC-Zl.4, general inspection level II. An inspection lot shall conskt of all 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-85725A = 9999906 2065717 9bT Inspection Examination MIL-P RI- 8 5 72 5 A(AS) Requirement Method par
43、agraph Paragraph units of the same size and design produced under the same conditions and offered for inspection at one time. Materiais Design Marking Workmanship Table III. Group A inspection. 3.2 3.3 3.7 3.8 4.5.1 4.5.1 4.5.1 ! 4.5.1 4.3.2 Group B inspection. Group B inspection shall consist of th
44、e inspections listed in table IV, performed in the order shown. Group B inspection shall be performed on sample units which have been subjected to and have passed the group A inspection. The sampling for Group B inspection shall be in accordance with ASQC-21.4, general inspection level II. Table IV.
45、 Group B inspection. Inspection Examination Dimensions Weight Guide rails Tier insertiodextraction u Pressure drop Leakage Mechanical performance Requirement paragraph 3.5 3.6 3.4.2.1 3.4.2.2 3.4.2.3 3.4.2.4 Method Paragraph 4.5.1 4.5.1.1 4.5.3.1 4.5.3.2 4.5.3.3 4.5.3.4 - 1/ This test is not applica
46、ble for Format E designs. 4.3.3 Group C inspection. Group C inspection shall consist of the inspections listed in table V, perfonned in the order shown. Group C inspection shall be performed on nine units of the same design which have passed groups A and B inspections. The units shall not be subject
47、ed to any screening test prior to Group C inspection. 4.3.3.1 Failures. If one or more units fail to pass the group C inspection, the entire sample shall be considered to have failed. 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-PRF-85725A
48、 9799906 20b5718 8Tb m MIL-PRF-S5725A(AS) TABLE V. Group C inspection. Inspection High temperature Low temperature Temperature shock Humidity Fungus salt fog Acceleration Vibration Shock Crash safty Guide rails Tier insertiodexiraction Pressure drop Thermal Shielding outside-to-inside Shielchg tier-
49、to-tier Leakage Requirement paragraph 3.4.1.1 3.4.1.2 3.4.1.3 3.4.1.4 3.4.1.5 3.4.1.6 3.4.1.7 3.4.1 .S 3.4.1.9 3.4.1.10 3.4.2.1 3.4.2.2 3.4.2.3 3.4.2.4 3.4.3 3.4.4.1.1 3.4.4.1.2 Method I. Paragraph 4.5.2.1 4.5.2.2 4.5.2.3 4.5.2.4 4.5.2.5 4.5.2.6 4.5.2.7 4.5.2.8 4.5.2.9 4.5.2.10 4.5.3.1 4.5.3.2 4.5.3.3 4.5.3.4 4.5.4 4.5.5.1.1 4.5.5.1.2 - 1/ This test is not applicable for Format E designs. 4.4 Inspection conditions. The following conditi
