1、, MIL-N-1675A 58 = 9979706 0373759 T W i MILITARY SPECIFICATION NAVIGATIONAL SET, OMEGA AN/ARN-99 (V) 1 MIL-N-816 7 5A (AS) 9 November 1976 Superseding MIL-N-81675 (AS) 10 May 1971 This specification has been approved by the Naval Air Systems Command, Department of the Navy 1. SCOPE 1.1 shall receiv
2、e the three-frequency OMEGA transmissions and transmit, in digital fom, the sine and cosine correlations of these signals to an associated Computer. Scope - The equipment covered by this specification 1.2 Classification - The equipment covered in this specifi- cation shall consist of the following i
3、tems: Units Type Designstion Applicable Paragraph (1) Receiver-Converter OR-9O/ARN-C9(V) 3.5.1 (2) Antenna-Coupler AS-2623/ARN-99 (V) 3.5.2 or AS-2623A/AN-99(V) (3) Mounting Base M!r-4534 /m-9 9 (V) 3.5.3 1.3 Associated Equipment - The equipment covered in this specification shall operate with the t
4、ypical associated equipment listed in Paragraph 6.7. The performance of the OMEGA Navigational Set AN/ARN-99(V)1 with typical associated equipment shall be as specified iii Appendix A. 2. APPLICABLE DOCUMENTS 2.1 General - The following documents of the issue in effect on the date of invitation for
5、bids form a part of this specification to the extent specified herein. SPECIFICATIONS Military 5 ! MIL-W-5088 Wiring; Aircraft, Installation of MIL-E-5400 Electronic Equipment, Aircraft, General Specification FSC 5826 for THIS DOCURsdENT CONTAINS - sf PAGES. -1- -t. - - Provided by IHSNot for Resale
6、No reproduction or networking permitted without license from IHS-,-,-MIL-N- 816 7 5A (AS) MIL-T-5422 MIL-M-77 93 MIL-E-17555 MIL-T-18303 MIL-N-18307 MIL-T-23103 MIL-C-81332 MIL-C-81511 Testing, Environmental, Aircraft: Electronic Equipment Meter, Time Totalizing Electronic and Electrical Equipment a
7、nd Associated Repair Parts, Preparation for Delivery of i Test Procedures; Preproduction and Acceptance for Aircraft Electronic Equipment, Format for Nomenclature and Nameplates for Aeronautical Electronic and Associated Equipment Thermal Performance Evaluation, Airborne Electronic Equipment; Genera
8、l Requirement for Computer Set, Digital AN/ASQ-l14(V) Connectors, Electrical, Circular, High Density Quick Disconnect, Environment Resisting; and Accessories General Specification for Naval Air System Command AR- 5 AR-10 AR-34 WR-loi STANDARDS Military MIL-STD-415 MIL-STD-461 MIL-STD-4 70 Microelect
9、ronic Devices Used in Avionic Equipment Procedures for Selection and Approval of Maintainability of Avionics Equipment and Systems, General Requirements for Failure Classification for Reliability Testing, General Requirements for Weapons Requirement for Advanced ASW Avionics System Part 11 - Selecti
10、on and Testing of Microelectronic Circuitry for Advanced ASW Avionics Systems; A-NEW Test Provisions for Electronic System and Associated Equipment, Design Criteria for Electromagnetic Interference Characteristics, Require- ments for Equipment Military Standard Maintainability Program Requirements a
11、 -2- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-N-81675A 58 W 7777706 OL7L7bL W MIL-N-81675A (AS) i MIL-STD-471 Military Standard Maintainability Demonstration MIL-STD-704 Electric Power, Aircraft, Characteristics and Utilization of MIL-ST
12、D-781 Reliability Tests, Exponential Distribution MIL-STD-785 Reliability Program for System and Equipment Development and Production MIL-STD-794 Parts and Equipment, Procedures for Packaging and Packing of MS-17322 Meter, Time-Totalizing, Miniature, Digital, 115 Volt, 400 Hertz Federal FED-STD-595
13、Colors 2.1.1 Availability of Documents (1) When requesting specifications, standards, draw- ings, and publications, refer to both title and number. Copies of this specification and applicable specifications required by contractors in connection with specific procurement functions may be obtained upo
14、n application to the Commanding Officer, Publications and Forms Center, Code 105, 5801 Tabor Avenue, Philadelphia, Pennsylvania 19120. d F 3. REQUIREMENTS 3.1 Preproduction - This specification makes provisions for preproduction testing. 3.2 Parts and Materials - In the selection of parts and materi
15、als 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 herein. Part II of WR-101 shall be used as a guide. (2) Other pa
16、rts and materials requirements shall conform to Specification KIL-E-5400. (3) Nonrepairable subassemblies shall be used in accordance with Specification AR-10 and as outlined in Specification MIL-E-5400. -3- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IH
17、S-,-,-MIL-N-81675A 58 W 7779706 OL7L7b2 T m MIL-N- 81 6 7 5A (AS) (4) When previously produced models of this equipment did not use nonrepairable subassemblies, the design shall not be changed to employ nonrepairable assemblies without the approval of the procur- ing activity. 3.2.1 Nonstandard Part
18、s and Materials Approval - Approval for the use of nonstandard parts and materials (including electron tubes, transistors and diodes) other than microelectronic devices shall be obtained as outlined in Specification MIL-E-5400, devices shall be approved as outlined in AR-5. Microelectronic 3.2.2 Mic
19、roelectronic Modular Assemblies - When used, Micro- electronic Modular Assemblies shall meet the requirements of Specifica- tion AR-5. 3.2.3 Modules - The electronic portions of the equipment Plug in subassemblies shall be so designed as to preclude im- shall be functionally modularized in accordanc
20、e with Specification AR-10. proper interchange or insertion. 3.2.4 AR-10 Deviations - WRAs (Weapon Replaceable Assembly) shall not be equipped with fault location indicators as required by Paragraph 3.3.1.2 of AR-10. Receiver-Converter Group shall be a display of the associated display unit under as
21、sociated computer control. The fault location indicator for the See also Paragraph 3.3.7.9. 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 her ein. 3.3
22、.1 Total Weight - The total weight of the equipment, excluding cables, shall be a minimum consistent with good design and shall not exceed 37.85, pounds. 3.3.2 Reliability - The contractor shall conduct a reli- ability program using MIL-STD-785 as a guide. supplier who has previously produced the eq
23、uipment, the program pre- viously used may be continued unless otherwise indicated in the con- tract or order. On a reorder from a 3.3.2.1 Operational Stability - The equipment shall operate with satisfactory performance, continuously or intermittently for a period of at least 3000 hours without the
24、 necessity for readjustment of any controls which are inaccessible to the operator during normal use. I -4- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-Lb75A 58 m 777770b 0373763 I m c MIL-N-81675A (AS) 3.3.2.2 Operating Life - The equipmen
25、t shall have a minimum total operating life of 20,000 hours with reasonable servicing and replacement of parts, specified by the contractor. Farts requiring scheduled replacement shall be 3.3.2.3 Reliability in Mean Time Between Failure (MBF) - The equipment, including any Built-in-Test provisions,
26、shall have 1000 hours of mean (operating) time between failures when tested and accepted as outlined under the requirements of Paragraph 4.4.3. 3.3.2.4 Time Totalizing Meter - The Receiver-Converter Group shall include a time totalizing meter conforming with the applicable requirements of Specificat
27、ion MIL-M-7793 and MS-17322-10. be located on Interconnecting Box J-3008/ARN-99(V). Meter shall 3.3.3 Cabling and Connections 3.3.3.1 Cables and Connectors - The equipment shall provide Miniature quick disconnect circular connectors shall con- for the use of cables and connectors in accordance with
28、Specification MIL-E-5400. form to the applicable requirements of Specification MIL-C-81511. 3.3.3.2 Interconnection Cabling - The equipment shall be I capable of satisfactory operation using external wiring in accordance with the applicable requirements of Specification MIL-W-5088, external wiring s
29、hall 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 attache
30、d to the cables shall not be supplied as part of the equipment. The 3.3.4 Control Panels - The control will be provided as specified in Appendix A. 3.3.5 Interchangeability - The equipment shall meet the interchangeability requirements of Specification MIL-E-5400. ments shall be required when replac
31、ing plug-in subassemblies, No adjust- 3.3.6 Interference Control - The generation of radio inter- ference by the equipment and the vulnerability of the equipment to radio interference shall meet the requirements of MIL-CTD-461, except for the following modifications: -5- Provided by IHSNot for Resal
32、eNo reproduction or networking permitted without license from IHS-,-,-MIL-N-Lb75A 5 = 777770b OL7L764 3 I MIL-N- 81 67 SA (AS) Receiver-Converter CEO1 Broadband CEO1 Narrowband RE01 Use of 2.5k3-I High Pass Filter 30 db above specification limit 20 db above specification limit Antenna-Coupler RS02 -
33、 Test levels or the case test shall be limited to the threshold of antenna susceptibility. 3.3.7 Provisions for Maintainability - Built-in test equip- ment, construction and packaging, and provisions for test points shall be as specified herein and generally in accordance with Specification AR-10. 3
34、.3,7.1 Compatibility with VAST - The equipment shall conform with the maintainability philosophy as specified herein. bility is desirable, but is not a prime design objective. VAST compati- 3.3.7.2 Maintainability Program - The contractor shall conduct a maintainability program in accordance with MI
35、L-STD-470. 3.3.7.3 Maintainability Requirements - The equipment shall be such that all corrective maintenance can be accomplished by maintenance personnel who have attained the E-4 skill level and who have success- fully completed appropriate training programs. 3.3.7.4 of the equipment shall be such
36、 that it will be possible in 90% of the cases of failure, to perform all corrective organization maintenance actions, other than combat damage repair, within a period not exceeding 30 minutes (the 30 minute corrective action time shall include all elements except aircraft access time and time to obt
37、ain spares). The 30 minute corrective action time is predicated on fault isolation and system test routine execution in ten seconds or less. Failures are limited to the plug-in modules and components that affect equipment operation, As here applied, an organizational corrective maintenance action in
38、cludes the following: Organizational Maintainability - The characteristics (1) Verification of a fault (2) Location of the fault to a LRA (Light Replaceable Assembly) (3) Correction or repair (4) Check out of the repair -6- Provided by IHSNot for ResaleNo reproduction or networking permitted without
39、 license from IHS-,-,-MIL-N-Lb75A 58 7777906 OL71765 5 1 (2) Maintenance replacement of WRAs or LUS shall be capable of being made in the aircraft using simple hand tools. 3.3.7.4.2 Fault Location Indicators - The fault location indicator for the Receiver-Converter Group shall be a display of the as
40、sociated display unit under associated computer control. MIL-N-816 7 5A (AS) 3.3.7.4.1 Maintenance Concept (1) By utilization or computer controlled diagnostics and on board test equipment, faults will be isolated to the appropriate WRA or LRA which will then be removed and replaced. 3.3.7.5 Built-i
41、n Test (BIT) Functions - Suitable BIT features shall be incorporated into the Receiver-Converter Group to provide both a failure detection and a fault location function for 95% of the failures when initiated and controlled by the associated computer. (Reference paragraph 3.4.8) . 3.3.7.5.1 Built-In-
42、Test (BIT) Operation - The operation of BIT shall be computer initiated with provisions for exercising all functions of the equipment to obtain a GO/NO-GO indication, and for isolating faults to a LRA. - The BIT function shall 3.3.7.5.2 Built-In-Test (BIT) Indicators provide the operator with an ind
43、ication of equipment status by energizing an advisory or caution indicator (paragraph 3.3.7.4.2) when equipment performance is below an acceptable level, both while on the ground and in flight. 3.3.7.5.3 Receiver-Converter Group Tests - The equipment shall generate and provide test signals to verify
44、 the conpiete operation of the OR-90/fd?-99(V) Receiver-Converter Group when initiated and controlled by the associated computer. The equipment shall provide for the following methods of fault detection and fault isolation: (1) Systems GO/NO GO Test (SYGXOG) (2) Diagnostic Tests 3.3.7.5.3.1 Systems
45、GO/NO GO Tests (SYGNOG) - SYGNOG tests performed by the computer shall be primarily a fault detection test to determine functional availability ar?d status of the equipment. 3.3.7.5.3.2 Diagnostic Tests - Diagnostic tests performed by the computer shall provide fault location to the LRAs of the equi
46、pment. 3.3.7.6 Special Support Equipment - The Receiver-Converter Group shall not require Special Support Equipment Lo perform organizational level maintenance actions. General purpse support equipment, i.e., meters, oscilloscopes, will be allcwed in the performance of organizational maintenance act
47、ions. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-Lh75A 58 m r 9999906 0373766 7 MIL-N- 81 6 7 5A (AS ) 3.3.7.7 Packaging Requirements - The Receiver-Converter Group shall be packaged in modular form so that all subassemblies shall be of th
48、e plug-in module type, except the Interconnecting Box J-3008/ARN-99 (V) , and are easiiy removable without special tools for maintenance. 3.3.7.7.1 %dule Arrangement - Module arrangement will be such that access to each module does not require the removal of adjacent modules. 3.3.7.7.2 Keying - Modu
49、les and connectors shall be keyed to prevent the insertion of a connector or module into an improper location within or on the equipment. 3.3.7.7.3 Access - It shall be possible to perform 95% of the organizational maintenance actions by access to one side of the Receiver- Converter Group, with the unit still in the aircraft rack. 3.3.7.7.4 Base Plate Pin Configuration - The assignment of functions on the pins of the base plate m
