1、MIL-D-81893A (AS) i8 DECEMBER 1978 SUPERSEDING 17 MARCH 1975 MIL-D-81893 (AS) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-D-81893A (AS) MIL-T-5422 Testing, Environmental, Aircraft Electronic Equip- ment MIL-C-6781 Control Panel; Aircraft Equi
2、pment, Rack or Console MIL-P-7788 Panels, Information, Integrally Illuminated MIL-M-7793 Meter, Time Totalizing MIL-A-8591 Airborne Stores and Associated Suspension Equipment; MIL-14-16878 Wire, Electrical, Insulated, High Temperature Mounted General Design Criteria for MIL-T-28303 Test Procedures;
3、Preproduction and Acceptance for MIL-N-18307 MIL-L-19538 Lacauer. Acrylic-nitrocellulose Gloss (For Aircraft Aircraft Electronic Equipment, Format for Nomenclature and Nameplates for Aeronautical Electronic and Associated Equipment c Us e) Naval Air Systems Command AR- 5 AR- 1 O STANDARDS Microelect
4、ronic Devices Used in Avionic Equipment, Procedures for Selection and Approval of Maintainability of Avionic Equipment and Systems, General Requirements for Military MIL-STD-105 MIL-STD-461 Interference Control Requirements, Aircraft MIL-STD-470 Maintainability Program Requirements MIL-STD-704 Elect
5、ric Power, Aircraft, Characteristics and Sampling Procedures and Tables for Inspection by Attributes Equipment Utilization of Reliability Tests, Exponential Distribution -:. MIL-STD-781 -, 1 a -I . - 1 I. - 1 % - - . - -_ _ %- - * -5r %? Provided by IHSNot for ResaleNo reproduction or networking per
6、mitted without license from IHS-,-,-MIL-STD-785 Reliability Program for Systems and Equipment MIL-STD-794 Parts and Equipment, Procedures for Packaging MIL-STD-810 Environmental Test Methods MIL-STD-2074 Failure Classification for Reliability Testing MS25212 Control Panel, Console Type Aircraft Equi
7、pment, Development and Production and Packing of (Supercedes AR-34) Basic Dimensions 2.1.1 Availability of Documents - When requesting specifications, standards, drawings, and publications, refer to both title and number. Copies of this specification and applicable specifications required by contrac
8、tors in connection with specific procurement functions may be obtained upon application to the Commanding Officer, Publications and Forms Center, Code 105, 5801 Tabor Avenue, Philadelphia, PA 19120. . 3. REQUIREMENTS 3.1 Preproduction - This specification makes provisions for preproduction testing.
9、3.2 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: (1) Microelectronic technology shall be considered and microelectronic items shall conform to requirements specified he
10、rein. Other parts and materials requirements shall conform to Specification MIL-E-5400 except when the use of such parts would conflict with interchangeability requirements for previously produced models of this equipment. Component parts shall be selected in the following order of precedence: (a) T
11、X, ER or other higher reliability parts. (b) Military standard parts, (c) Military Specification parts (not listed in book form standards). (d) Nonstandard parts previously approved for use in other designs. (e) Nonstandard parts. .3 Provided by IHSNot for ResaleNo reproduction or networking permitt
12、ed without license from IHS-,-,-MIL-D-8 18 9 3A (AS) (3) Nonrepairable subassemblies shall be used in accordance with Specification AR-10 and as outlined in Specification MIL-E-5400, (4) When previously produced models of this equipment did not use nonrepairable subassemblies, the design shall not b
13、e changed to employ nonrepairable assemblies without the approval of the procuring activity. 3-2.1 Nonstandard Parts and Material Approval - Approval for the use of nonstandard parts and materials (including electron tubes, tran- sistors and diodes) other than microelectronic devices shall be obtain
14、ed as outlined in Specification MIL-E-5400. approved as. outlined in AR-5. Microelectronic devices shall be 3.2.2 Microelectronic Modular Assemblies - When used, Micro- electronic Modular Assemblies shall meet the requirements of Specification AR-5. Conformal coatings, encapsulants, embedments or po
15、tting materiais used with modular assemblies containing.integrated circuits and discrete parts shall be easily removable without damage to the assembly. 3.2.3 Modules - The electronic portions of the equipment shall be functionally modularized in accordance with Specification AR-10. ical subassembli
16、es shall be modularized to the extent practical to facilitate production assembly and rework and to facilitate changes. The use of cements and welds or other forms of permanent bonds which will consume appreciable rework time shall be avoided in the design of repairable assemblies. blies that requir
17、e machining, lapping, or custom fitting shall be avoided. Where two units must be matched and used with each other, an assembly drawing shall be created that identifies this requirement. When adjustment or alignments must be made, components shall be pinned, slotted, or scribed to permit rapid reass
18、embly with minimum gauging and trial and error. Replace- ment of modules shall not require use of solder, cement or welding. design shall be such that reverse or improper assembly, mating or installation is impossible, Hard wired/chassis mounted components are undesirable and will not be used withou
19、t specific written approval of the procuring activity. Where possible, circuitry loops shall be contained on one shop replaceable assembly (SRA). In cases that the number of discrete components in a loop exceed the practical or physical space available on one SRA, mounting and packaging shall be in
20、a manner most adaptable to maintainability. able or disposable-on-failure subassemblies may be used and are preferred, providing such subassemblies are sufficiently reliable and inexpensive to justifythat concept, or where significant weight savings may be achieved, or where mechanical integration w
21、ith or modification of existing design required encapsulated subassemblies, or in the case of microwave energy devices. candidates shall be identified. Mechan- Assem- The Nonrepair- Items recommended as nonrepairable or disposable-on-failure Provided by IHSNot for ResaleNo reproduction or networking
22、 permitted without license from IHS-,-,-3.3 Design and Construction - The equipment shall conform with all the applicable requirements of Specification MIL-E-5400 for design, construction and workmanship, except as otherwise specified herein. “3.3.1 Total Weight - The total weight of the equipment e
23、xcluding cables shall be a minimum consistent with good design and shall not exceed 220 pounds empty. When fully loaded, the total gross weight may vary from 500 to 550 pounds maximum depending on chaff payload configuration or mix, Empty and full weight shall be clearly marked on Center Body Shell.
24、 *3.3.2 Reliability - The contractor shall conduct a reliability program in accordance with an approved AN/ALE-41 Reliability/Maintainability Program Plan of.paragraph 3.3.2.1. previously produced the equipment, the program plan previously used may be continued unless otherwise indicated in the cont
25、ract or order, On a reorder from a supplier who has *3.3.2 .I organization, implementation and conduct of a coordinat.ed AN/ALE-41 Reliability and Maintainability Program shall be grepared by the contractor and submitted to the proCuTing activity for review and appFova1, AN/ALE-41 Maintenance Plan,
26、AvE1P-116, dated 21 Nov 1978; MIL dispense rate, pulse length, and pulse interval. - Rotary switch shall control rate at which chaff is dispensed from chaff rolls in either Continuous or Pulse Mode operation (Reference Table 1). - Rotary switch shall control the dispenser “ON“ time for each pulse cy
27、cle during Pulse Mode operation (Reference Table 1). - Rotary switch shall control “OFF“ time for each pulse cycle during Pulse Mode operation (Refer- enc,e Table 1). - Indicate quantity of chaff remaining in dispenser, - Two lights, one for each dispenser. Lights shail illuminate when operating pow
28、er is applied to the dispensers. 19 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.- MIL-D-I,873A 58 = 7773706 0372378 7 MIL-D-8 189 3A (AS) “3.5.2.7.1 Switches - All switches shall be provided with mechanical stops to prevent inadvertent settings
29、in blank positions, “3.5.2.8 Electrical Connections - Four receptacles shall be pro- vided on the Control Indicator for interconnecting to the dispensers and an additional Control Indicator as indicated below: ReEerence Receptacle De si gnat i on Type -s_ Function J1 MS3122-E-14-19P Power inlet 52 5
30、3 54 MS3122-E- 14- 19P Power in/out for parallel operation MS 312 2 - E- 2 2 - 55P MS 312 2- E- 22- 55P Outlet to left dispenser Outlet to right dispenser of second Control Indicator. “3.5.2.8.1 Connector Covers - Metal connector covers shall be provided They shall be connected to the Control Indica
31、tor for all four receptacles, cover by chains. “3.5.3 Interconnecting Box J-3386/ALE-41 3.5.3.1 Function - The Interconnecting Box shall provide an inter- ace between the Control Indicator and the Dispenser Set. “3.5.3.2 Form Factor - The Interconnecting Box is approximately 4.50 inches in height, 5
32、.12 inches in width and 1.70 inches in depth and shall be capable of being inserted in the Frame and Panel Assembly as a plug-in module, 3.5.3.3 Weight - The weight of the Interconnecting Box shall not exceed 2.0 pounds. circuitry to provide the interface between the Control Indicator and the dispen
33、ser, Assembly shall be as follows: 3.5.3.4 Contents - The Interconnecting Box shall contain the necessary “3.5: 3.5 Electrical Connections - Connections to the Frame and Panel Reference Receptacle - Designation Type Function P1 M24 308/4- 5 Power/Signal input/output 20 Provided by IHSNot for ResaleN
34、o reproduction or networking permitted without license from IHS-,-,-MIL-D-1893A 58 = 9999906 0172377 O m MI L- D- 8 1 89 3A (AS) 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection - Unless otherwise specified in the contract or purchase order, the supplier is responsible for the perfo
35、rmance of all inspection requirements specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to the Government. .The Government reserves the right to perform any.of th inspections set forth in the specification where such
36、inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.1.1 Classification of Tests - Items covered by this specifica- tion shall be subjected to the following tests to determine compliance with all applicable requirements: (1) Preproduction (First Arti
37、cle) Tests (2) Initial Production Tests (3) Acceptance Tests (4) Life Tests (5) Maintainability Demons trat ion Tes ts 4.2 Preproduction (First Article) Tests Preproduction tests shall he made on equipment representative of the production units to be supplied under the contract. Preproduction tests
38、shall be accomplished under the approved test procedure of paragraph 4.7. and the procuring activity shall be advised when tests are to be conducted so that a representative may be designated to witness or supervise the tests when so desired. Contractors not having adequate facilities to conduct all
39、 required tests shall obtain the services of a commercial testing laboratory acceptable to the Government. The Government inspector 4.2.1 Preproduction (First Article) Test Data - The contractor shall submit all data collected in conducting these tests to the procuring agency for review and approval
40、. *4.2.2 Scope of Test - Preproduction tests shall include all tests deemed necessary by the procuring activity to determine that the equipment meets all of the requirements of this specification, other applicable specifications, and the contract. Preproduction tests, shall include envi- ronmental t
41、ests in accordance with the procedures of specification MIL-T- 5422 and MIL-STD-810, as required. In addition, the Dispensing Set shall be subjected to ground functional testing which shall demonstrate, to the satisfaction of the procuring activity, the capability of the dispensing set to dispense c
42、haff in accordance with any possible combination of operating modes and control parameter selections listed in Table 1. 21 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-D-81893A 58 W 999990b O172400 3 W MIL-D-8 189 3A (AS 1 (1) For the first ha
43、lf of this functional test,at least three different dispense rates shall be utilized in the continuous dispensing mode. pulse length and pulse interval combinations, pro- viding pulse mode duty cycles of 0.25, 0.50, and 0.89, with adispense rate of 8.0 inches/second, shall be used for the last half
44、of the test. Three different (2) The Control Indicator and Interconnecting Box shall be connected to the Dispensing Set and shall be utilized to control the dispenser. (3) Satisfactory completion of this test requires that: (a) During the performance of the test, chaff dis- pensing appears to be con
45、sistent with the operating modes and control selections. (b) Post test inspection indicates that the dis- penser is undamaged and free of malfunctions. 4.2.3 Preproduction (First Article) Approval - Approval of the preproduction camples shall be by the procuring activity upon satisfactory completion
46、 of all tests. No production equipment shall be delivered prior to the approval of the preproduction samples. equipment prior to the approval of the preproduction sample is at the con- tractors own risk. the contractor for his use in the fabrication and testing of equipment to be submitted for accep
47、tance. The preproduction sample(s) shall not be con- sidered as one of the deliverable equipments under the contract. Prefabrication of production The approved preproduction sample shall be retained by 4.2.4 Production Equipment - Equipments supplied under the contract shall in all respects, includi
48、ng design, construction, workman- ship, performance and quality, be equivalent to the approved preproduction sample. tests as imposed on the preproduction sample. with the above shall constitute cause for rejection and for equipment already accepted by the Government, it shsll be the obligation of t
49、he contractor to make necessary corrections as approved by the procuring activity. Each equipment shall be capable of successfully passing the same Evidence of non-compliance 4.3 Initial Production Tests - One of the first ten production equipments shall be selected and sent at the contractors expense to a designated Government laboratory for tests, by the procuring activity after the equipment has successfully passed all individua
