1、 MIL-F-26301G 6 July 2009 SUPERSEDING MIL-F-26301F 7 November 2003 DETAIL SPECIFICATION FLASHER, SOLID STATE, AIRCRAFT NAVIGATIONAL LIGHT, GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specifica
2、tion covers the general requirements for solid state aircraft flashers which are used for cycling aircraft position lights on and off. Flashers will have the load current controlled by a transistor, controlled rectifier, magnetic amplifier or equivalent device. Flashers have either single or dual ou
3、tput circuits. 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 additional information or as examples. While ever
4、y effort has 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 and 4 of this specification, whether or not they are listed. 2.2 Government documents. Specifications, standards, and handbooks. T
5、he 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 cited in the solicitation or contract. FEDERAL STANDARDS FED-STD-H28 - Screw-Thread Standards for Federal Services. D
6、EPARTMENT OF DEFENSE SPECIFICATIONS MIL-PRF-5606 - Hydraulic Fluid, Petroleum Base; Aircraft, Missile and Ordnance. MIL-DTL-5624 - Turbine Fuel, Aviation, Grades JP-4 and JP-5. MIL-A-8625 - Anodic Coatings for Aluminum and Aluminum Alloys. MS24577 - Flasher, Solid State, Aircraft Navigation Light. M
7、S25205 - Flasher, Solid State, Aircraft Light. MS27710 - Flasher, Solid State, Aircraft Navigation Light, 28 V dc. AMSC N/A FSC 5945 INCH-POUND Inactive for new design after 28 June 1996. No superseding specification. Comments, suggestions or questions on this document should be addressed to Defense
8、 Supply Center Columbus, ATTN: VAT, Post Office Box 3990, Columbus, OH 43218-3990, or emailed to relaydla.mil Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. Provided by IHSNot for Re
9、saleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-26301G 2 DEPARTMENT OF DEFENSE STANDARDS MIL-STD-461 - Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipment. MIL-STD-704 - Aircraft Electric Power Characteristics. MIL-S
10、TD-810 - Environmental Engineering Considerations and Laboratory Tests. MIL-STD-1285 - Marking of Electrical and Electronic Parts. (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or http:/assist.daps.dla.mil/ or from the Standardization Document Order Desk,
11、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 cited in the solicitation or contract. AMERICAN SOC
12、IETY FOR TESTING AND MATERIALS (ASTM) ASTM B633 - Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel. ASTM D910 - Standard Specification for Gasolines, Aviation. ASTM G 21 - Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi. (Applicati
13、on for copies should be addressed to ASTM International at http:/www.astm.org or, PO Box C700, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) 2.4 Order of precedence. Unless otherwise notes herein or in the contract, in the event of a conflict between the text of this document and the ref
14、erences 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 Specification sheets. The individual item requirements shall be as specified herein and
15、in accordance with the applicable 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 (see 6.3) in a
16、ccordance with 4.2. 3.3 Materials. Materials shall be as specified herein. However, when a definite material is not specified, a material shall be used which will enable the flashers to meet the performance requirements of this specification. Materials used shall be self-extinguishing and shall not
17、support combustion, emit noxious gases in harmful quantities, emit gases in quantities sufficient to cause explosion of sealed enclosures, or form current-carrying tracks when subjected to any of the tests specified herein. Unless otherwise specified (see 3.1), the selection of material shall be suc
18、h as to provide a shelf life of at least 2 years without affecting the operation of the flasher. Acceptance or approval of any constituent material shall not be construed as a guaranty of the acceptance of the finished product. 3.3.1 Metals. Metals shall be of a corrosion-resistant type or shall be
19、plated or treated to resist corrosion. 3.3.1.1 Dissimilar metals. When dissimilar metals are used in intimate contact with each other, protection against electrolysis and corrosion shall be provided. The use of dissimilar metals in contact, which tends toward active electrolytic corrosion (particula
20、rly brass, copper, or steel used in contact with aluminum or aluminum alloy), is not acceptable. However, metal spraying or metal plating of dissimilar or aluminum base metals to provide suitable abutting surfaces is permitted. Dissimilar metals should be as defined in 6.4. In hermetic seals, the 0.
21、25 volt difference between the header material and the housing material is not applicable. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-26301G 3 all surfaces required to act as paths for electrical power and from local areas under screws, nu
22、ts, etc., used for assembly or mounting purposes to provide an adequate bonding connection. 3.3.2 Fungus resistance. Materials used in construction of flashers shall be fungus inert in accordance with ASTM G 21. 3.3.3 Plating. Metals shall be of a corrosion-resistant type, or shall be plated or trea
23、ted to resist corrosion. Cadmium plating shall not be used for plating any part of the flasher. Zinc and unfused tin plating shall not be used for plating internal parts of the flasher. Zinc plating shall be in accordance with ASTM B633. 3.4 Design and construction. Flashers shall be of the design,
24、construction, weight, and physical dimensions specified (see 3.1). Flashers shall be designed to operate properly when mounted in any position. Construction shall be such as to take full advantage of the design for minimum size and weight, long life, maximum reliability, and minimum radio noise. 3.4
25、.1 Envelope. When specified (see 3.1), flashers shall be provided with a means to permit assured contact to case ground through a secure low resistance connection. The enclosure shall not be electrically connected to any terminal unless specified. 3.4.2 Paralleled semiconductors. Flashers shall not
26、utilize paralleled semiconductors for carrying rated lamp load. 3.4.3 Dimensions. The overall dimensions of the flasher shall be as specified (see 3.1). 3.4.4 Weight. The weight of the flasher shall be the minimum practicable and shall not exceed the specified maximum weight (see 3.1). 3.4.5 Mountin
27、g means. The mounting means shall be as specified (see 3.1). 3.4.6 Threaded parts. All threaded parts shall be in accordance with FED-STD-H28. Where practical, all threads shall be in conformity with the coarse-thread series. The fine-thread series may be used only for applications that show a defin
28、ite advantage through their use. Where a special diameter-pitch combination is required, the thread shall be of American National Form and of any pitch between 16 and 36, which is used in the fine thread series. Terminal threads shall be class 2A and 2B for external and internal threads, respectivel
29、y. 3.4.7 Functional diagram. A connection diagram of the external wiring of the flasher shall be provided. The diagram shall identify each terminal, shall be permanently attached to the flasher, and shall remain legible and securely attached to the flasher during all tests required by this specifica
30、tion. 3.4.8 Fail safe. Flashers shall be designed so that with rated voltage applied to the input terminals, only internal failure of the flasher timing circuitry will result in continuous rated power output from the output terminals. 3.4.9 Encapsulation. Unless otherwise specified (see 3.1), flashe
31、rs shall be encapsulated. 3.5 Electrical requirements. 3.5.1 Input power. The flashers shall meet all applicable requirements of this specification when operating from power sources as defined in MIL-STD-704, category B. Voltage transients having magnitudes and time durations as defined therein shal
32、l not damage the flashers. 3.5.2 Input voltage. The rated input voltage of each type of flasher shall be as indicated (see 3.1). When the rated input voltage is given as 28 volts ac or dc, the limiting input voltage for performance requirements shall be 26.3 to 29 volts. When the rated input voltage
33、 is given as 115 volts, 400 hertz (Hz), the limiting input voltage and frequency for performance requirements shall be 107.5 to 119.5 volts, rms, and 380 to 420 Hz, respectively. 3.5.3 Load requirement. Unless otherwise specified (see 3.1), flashers shall be capable of operating the applicable incan
34、descent lamp load specified in table I. Unless otherwise specified, lamp ratings are considered steady state current values. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-26301G 4 TABLE I. Lamp rating. Source voltage Load range (amperes) 28 V
35、 dc 28 V 400 Hz ac 115 V 400 Hz ac 28 V ac or dc 1.0 to 7.5 1.0 to 5.0 0.25 to 4.0 1.0 to 15.0 3.5.4 Flash characteristics. 3.5.4.1 Flash rate. The flash rate shall be as specified in 3.5.4.1.1 and 3.5.4.1.2, as applicable. 3.5.4.1.1 Single output circuits. When flashers are tested as specified in 4
36、.4.2.1.1, the flash rate shall be as specified (see 3.1). 3.5.4.1.2 Dual output circuits. When flashers are tested as specified in 4.4.2.1.2, the flash rate shall be as specified (see 3.1). 3.5.4.2 Flash cycle (on-to-off ratio). The “on“ time of the flash cycle shall be considered that portion of th
37、e cycle during which the voltage supplied to the lamp load is 90 percent or more of the rated voltage. The “off“ time shall be considered that portion when the voltage supplied to the load is less than 10 percent of rated voltage. The flash cycle shall be as specified in 3.5.4.2.1 and 3.5.4.2.2, as
38、applicable. 3.5.4.2.1 Single output circuits. When flashers are tested as specified in 4.4.2.2.1, the “on“ time shall be 70 10 percent of the total cycle. 3.5.4.2.2 Dual output circuits. When flashers are tested as specified in 4.4.2.2.2, the “on“ time of one circuit shall equal the “off“ time of th
39、e other and vice versa within 5 percent. 3.5.4.3 Switching time. When flashers are tested as specified in 4.4.2.3, the switching time shall be as specified in 3.5.4.3.1 and 3.5.4.3.2, as applicable. 3.5.4.3.1 DC flashers. The elapsed time for switching the “off“ to “on“ or “on“ to “off“ condition sh
40、all be not greater than 0.03 second for dc flashers. 3.5.4.3.2 AC flashers. Zero crossover switching shall be used for initiation and termination of the “on“ time of each cycle. Initiation of the “on“ time shall coincide with zero voltage crossover and termination of “on“ time shall coincide with ze
41、ro current crossover within 20 degrees, respectively. 3.6 Voltage drop. Flashers shall be tested as specified in 4.4.3 and unless otherwise specified (see 3.1), the voltage drop within the flasher shall not exceed 4.0 percent of the input voltage for any value of load within the specified limits. 3.
42、7 High and low temperature soak and operation. When tested as specified in 4.4.4, flashers shall operate satisfactorily when tested under the following conditions. 3.7.1 High temperature. At 71C (unless otherwise specified) (see 3.1), following the soak period specified in 4.4.4.1, flashers shall me
43、et the requirements of 3.5.4.1, 3.5.4.2, 3.5.4.3, and 3.6, as applicable. 3.7.2 Low temperature. At -62C and -54C, following the soak period specified in 4.4.4.2, flashers shall meet the requirements of 3.5.4.1, 3.5.4.2, 3.5.4.3, and 3.6, as applicable. There shall be no distortions, cracking, diffe
44、rential expansion or pliability of nonmetallic parts. 3.8 Vibration. After flashers are tested as specified in 4.4.5, they shall meet the requirements of 3.5.4.1, 3.5.4.2, 3.5.4.3, and 3.6, as applicable. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,
45、-,-MIL-F-26301G 5 3.9 Immersion. When flashers are tested as specified in 4.4.6, there shall be no damage that would affect subsequent operation. 3.10 Shock. After flashers are tested as specified in 4.4.7, they shall meet the requirements of 3.5.4.1 and 3.5.4.2, as applicable. 3.11 Altitude. When f
46、lashers are tested as specified in 4.4.8, there shall be no damage that would affect subsequent operation. 3.12 Humidity. After flashers are tested as specified in 4.4.9, they shall meet the requirements of 3.5.4.1 and 3.5.4.2, as applicable. 3.13 Salt fog. When flashers are tested as specified in 4
47、.4.10, they shall meet the requirements of 3.5.4.1, 3.5.4.2, and 3.5.4.3, as applicable. 3.14 Sand and dust (when specified) (see 3.1). When flashers are tested as specified in 4.4.11, they shall meet the requirements of 3.5.4.1, 3.5.4.2, and 3.5.4.3, as applicable. 3.15 Electromagnetic interference
48、. When flashers are tested as specified in 4.4.12, they shall meet the requirements of MIL-STD-461, equipment class A-1. Following the test, flashers shall meet the requirements of 3.5.4.1 and 3.5.4.2, as applicable. 3.16 Transient voltage. When flashers are tested as specified in 4.4.13, there shal
49、l be no evidence of damage. 3.17 Life. When flashers are continuously operated as specified in 4.4.14 for the specified period of time (see 3.1), there shall be no failures. Following this test, flashers shall meet the requirements of 3.5.4.1, 3.5.4.2, 3.5.4.3, and 3.6, as applicable. 3.18 Marking. Flashers shall be marked in accordance with MIL-STD-1285 with the following information, as a minimum: a. MS or specification sheet Part or Identifying Number (PIN) (as ap
