1、 INCH-POUND MIL-PRF-7115G 11 July 2012 SUPERSEDING MIL-C-7115F 18 September 1992 PERFORMANCE SPECIFICATION CONVERTERS, AIRCRAFT, GENERAL SPECIFICATION FOR 1. SCOPE 1.1 Scope. This specification establishes the general requirements for converters that convert electrical power in aircraft from nominal
2、 115/200 volts alternating current (AC), 400 Hertz (Hz), AC three-phase, (see 6.7.1) aircraft electrical systems power to nominal 28 volt regulated and non-regulated direct current (DC) (see 6.7.4) power. 1.2 Classification. Converters are of the following types and classes, as specified (see 3.5.2.
3、1 and 6.2): 1.2.1 Converter type. Type I - Regulated converter designed to provide regulated DC output within a narrow voltage range (28.0 +/- 0.5 VDC) with provisions for parallel operation, when parallel operation is identified in the specification sheet. Type II - Non-regulated converter designed
4、 for a nominal 28 VDC output with provisions for parallel operation. Comments, suggestions, or questions on this document should be addressed to the NavalAir Systems Command (Commander, Naval Air Warfare Center Aircraft Division, Code 4L8000B120-3, Highway 547, Lakehurst, NJ 08733-5100) or by e-mail
5、 to michael.sikoranavy.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST online database at https:/assist.dla.mil. AMSC N/A FSC 6130 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS
6、-,-,-MIL-PRF-7115G 2 1.2.2 Converter class. Class A - Converters that are self-cooled and are designed to meet the temperature-altitude requirements of Figure 1, Class A. Class B - Converters that are self-cooled and are designed to meet the temperature-altitude requirements of Figure 1, Class B. Cl
7、ass C - Converters that are blast-cooled and are designed to meet the temperature-altitude requirements and inlet airflow requirements specified in the applicable specification sheet, and converters that are self-cooled and are designed to meet the temperature-altitude requirements of Figure 1, Clas
8、s C. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 or 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 ha
9、s been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3 or 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications standards and handbooks. The follo
10、wing 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 cited in the solicitation or contract. FEDERAL STANDARD FED-STD-595/37038 - Miscellaneous, Flat or Lusterless DEPARTMENT OF D
11、EFENSE SPECIFICATIONS MIL-DTL-15024 - Plates, Tags, and Bands for Identification of Equipment, General Specification for MIL-PRF-7115/2 - Converter, Aircraft, AC to DC, 200 Ampere, Type II, Class A MIL-C-7115/3 - Converter, Aircraft, 150 Ampere, Type II, Blast Cooled, Class C MIL-PRF-7115/4 Converte
12、r, Aircraft, 300 Ampere, Type II, Class A, Fan Cooled Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-7115G 3 DEPARTMENT OF DEFENSE STANDARDS MIL-STD-130 - Identification Marking of U.S. Military Property MIL-STD-202 - Electronic and Electric
13、al Component Parts MIL-STD-461 - Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipment MIL-STD-464 - Electromagnetic Environmental Effects Requirements for Systems MIL-STD-704 - Aircraft Electric Power Characteristics MIL-STD-810 - Environmental Eng
14、ineering Considerations and Laboratory Tests MIL-STD-889 - Dissimilar Metals MIL-STD-1285 - Marking of Electrical and Electronic Parts (Copies of these documents are available online at https:/assist.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4
15、D, 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 cited in the solicitation or contract. AEROSPACE INDUSTRIES ASSOCIATION (AIA) NAS
16、M14151 - Washer, Flat, Round, Corrosion Resisting Steel (for Electrical applications NASM35338 - Washer, Lock-Spring, Helical, Regular (Medium) Series NASM35650 - Nut, Plain, Hexagon, Machine Screw, UNF-2B. NASM90415 - Nut, Self-Locking, Steel, 160 KSI, 450 Degrees F, 12 Point, Captive Washer (Copie
17、s of these documents are available from http:/www.aia-aerospace.org or Aerospace Industries Association, 1000 Wilson Boulevard, Suite 1700, Arlington, VA 22209-3928.) JOINT ELECTRON DEVICE ENGINEERING COUNCIL (JEDEC) JESD471 - Symbol and Label for Electrostatic Sensitive Devices (Copies of this docu
18、ment are available from http:/www.jedec.org or JEDEC, 3103 North 10thStreet, Suite 240-S, Arlington, VA 22201-2107.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-7115G 4 RTCA, INCORPORATED DO-160G - Environmental Conditions and Test Proced
19、ures for Airborne Equipment (Applications for copies should be addressed to the RTCA, Inc., 1150 18th Street, NW, Suite 910, Washington, DC 20036-5133, http:/www.rtca.org/.) SAE INTERNATIONAL SAE-AMS2175 - Castings, Classification and Inspection of SAE-AMS-M-3171 - Magnesium Alloy, Processes for Pre
20、treatment and Prevention of Corrosion on SAE-AS7928 - Terminals, Lug: Splices, Conductor: Crimp Style, Copper, General Specification for SAE-AS8879 - Screw Threads - UNJ Profile, Inch Controlled Radius Root with Increased Minor Diameter SAE-AMS-A-21180 - Aluminum-Alloy Castings, High Strength SAE-AS
21、50881 - Wiring, Aerospace Vehicle (Copies of this document are available from www.sae.org or SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001.) 2.4 Order of precedence. Unless noted herein or in the contract, in the event of a conflict between the text of this document and the re
22、ferences cited herein (except for related specification sheets), 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 sheets. The individual item requ
23、irements shall be as specified herein and in accordance with the applicable specification sheet (see 6.11). In the event of any conflict between the requirements of this specification and the specification sheet, the latter shall govern. 3.2 Qualification. Converters furnished under this specificati
24、on shall be products that are authorized by the qualifying activity for listing on the applicable qualified products list (QPL) before contract award (see 4.2 and 6.3). 3.3 Materials. 3.3.1 Selection of materials, parts, and processes. The materials used shall enable the converter to meet all of the
25、 operational and environmental performance requirements of this specification and the applicable specification sheet (see 6.4.2 and 6.4.3). Castings shall be in accordance with SAE-AMS2175, or equivalent. Aluminum alloy castings shall be in accordance with SAE-AMS-A-21180. Defects not materially aff
26、ecting the suitability of the castings may be Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-7115G 5 repaired at the foundry or during machining by peening, impregnating, welding, or other methods acceptable to the qualifying activity. 3.3.2
27、 Moisture resistance. Non-metal materials, including plastics, ceramics, fabrics, and protective finishes, shall be moisture resistant. Non-metal materials and parts may be treated to conform to this requirement. Electrical connector selection shall be environment resistant for 500 hour salt spray e
28、nvironment (see 4.6.3). 3.3.3 Corrosion resistance. All metals used in the converter construction shall be processed and protected to resist corrosion (see 6.4.2.4). The use of magnesium is prohibited unless specifically approved for each application by the qualifying activity. Where approved, magne
29、sium alloy parts shall be surface treated for protection against corrosion in accordance with SAE-AMS-M-3171. Dissimilar metals, when used in contact with each other, shall be protected against electrolytic corrosion in accordance with MIL-STD-889. Corrosion protection applied to dissimilar material
30、s, such as plating and coatings, shall withstand the environmental tests herein. 3.3.4 Contamination by fluids. The converter shall show no deterioration at normal operating temperatures due to wetting from aviation fuel (JP-4/JP-5), fire extinguishing compounds, de-ice fluids, aircraft washing flui
31、ds, hydraulic fluids, and lubricating oils (see 4.6.3.12 and 6.8). 3.3.5 Toxicity and fire resistance. Materials used shall be flame-resistant, shall not support combustion, and shall be non-toxic when exposed to flame as well as when used under all operating and environmental conditions herein (see
32、 4.6.3.13). 3.3.6 Recycled, recovered, or environmentally preferable materials. The use of toxic chemicals, hazardous substances, and ozone depleting chemicals shall be avoided in the preparation and production of equipment (see 6.4.2.1). Recycled, recovered, or environmentally preferable materials
33、shall be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.3.7 Color. The converter shall be finished in 37038 black in accordance with FED-STD-595 or as identified
34、in the specification sheet. 3.4 Design and construction. The converter shall be a single package. Dynamic protective devices (fuses, circuit breakers, and thermally actuated switches) shall not be used. Deviations from this specification or from the applicable specification sheet must be specificall
35、y approved by the qualifying activity (see 6.3.2). 3.4.1 General mechanical and electrical design. The converter shall be constructed with parts and materials to provide the specified performance, reliability and service life under all environmental and operating conditions specified herein. Electro
36、nics parts shall be selected to enable the converter to provide the specified performance, reliability, and service life (see 6.4.3). Static discharge control shall be provided for protection of electronic devices during assembly and Provided by IHSNot for ResaleNo reproduction or networking permitt
37、ed without license from IHS-,-,-MIL-PRF-7115G 6 handling (see 6.4.3.4). Dielectrics used for electrical isolation shall be adequate to prevent breakdown under all specified environmental conditions for the life of the equipment. Equipment shall be free from irregularities or defects that could degra
38、de performance or durability. Standard design practices shall be followed (see 6.4). 3.4.2 Electrical design. 3.4.2.1 Electric connections. 3.4.2.1.1 External electric connections. The equipment shall be designed so that external connections and wiring can be made in accordance with the wiring insta
39、llation, ground return, and connector requirements of SAE-AS50881. The equipment structure shall not be used as a current path except for electromagnetic (radio noise) shielding. 3.4.2.1.1.1 Terminal block design. Where terminals are used for the external connection to converters, they shall be of t
40、he stud-type, and shall be designed so that the current is conducted by means of surface-to-surface contact, and not through the stud threads. All studs shall be steel, corrosion resistant, C-34 Rockwell minimum hardness, and shall be of sufficient length to accommodate two SAE-AS7928 lugs. Nuts use
41、d on terminals shall conform to NASM35650, NASM35338 for lock-spring washers, and NASM14151 for flat washers. There shall be no dielectric material in the compression build-up. The terminal block shall be so designed that it can be removed and replaced on the converter without the necessity of rebra
42、zing or soldering. Barriers affording a positive separation of leads and terminals shall be provided on the terminal block. Durable, reusable, non-conductive terminal covers shall be provided. Terminal designations shall be durably, legibly, and prominently marked on the terminal block. 3.4.2.1.2 In
43、ternal electric connections. Internal wiring and connections shall enable the converter to meet all of the operational and environmental performance requirements of this specification and the applicable specification sheet (see 6.4.3.2). 3.4.2.2 Adjustments. 3.4.2.2.1 Voltage setting and adjustments
44、. No provisions for external adjustments shall be provided and no internal adjustments or alignments shall be required during installation or during the life of the converter. All mechanical and electrical adjustments, such as voltage setting, voltage regulation settings, protection trip and reset s
45、ettings, shall be made at the time of manufacture or depot repair overhaul. If device-setting adjustments are provided, they shall be locked and sealed. No adjustment shall be required during aircraft installation or between overhauls. 3.4.3 Mechanical design. 3.4.3.1 Shock mounts. Shock mounts or v
46、ibration isolators shall not be used. 3.4.3.2 Interchangeability. All parts having the same manufacturers part number shall be directly and completely interchangeable with respect to installation and performance. Provided by IHSNot for ResaleNo reproduction or networking permitted without license fr
47、om IHS-,-,-MIL-PRF-7115G 7 3.4.3.3 Mechanical connections, fasteners, inserts, and hardware retention. Screw threads shall be unified inch standard series UN, UNR, and UNJ (see 6.4.2.3). UNJ screw threads shall conform to the requirements of SAE-AS8879. All internal and external threaded parts shall
48、 be positively locked (self-locking nuts, safety wiring, or acceptable alternative methods used to prevent loosening of threaded parts). Staking shall not be used. Internal devices with mechanical adjustment provisions shall be locked and sealed during production. Stud nuts shall be self-locking ste
49、el nuts with captive washer in accordance with NASM90415. 3.4.3.4 Cooling. The converter shall be self-cooled. No conduction cooling to the converter environment shall be allowed. Converters that are cooled by an external blast air supply shall meet the requirements of this specification and the applicable specification sheet when supplied with cooling
