《ARINC-404A-1974.pdf》由会员分享,可在线阅读,更多相关《ARINC-404A-1974.pdf(209页珍藏版)》请在三一文库上搜索。
1、 AIR TRANSPORT EQUIPMENT CASES AND RACKING ARINC SPECIFICATION 404A ISSUED: MARCH 15, 1974 AN DOCUMENT Prepared by AIRLINES ELECTRONIC ENGINEERING COMMITTEE Published by AERONAUTICAL RADIO, INC. 2551 RIVA ROAD, ANNAPOLIS, MARYLAND 21401 This document is based on material submitted by various partici
2、pants during the drafting process. Neither AEEC nor ARINC has made any determination whether these materials could be subject to valid claims of patent, copyright or other proprietary rights by third parties, and no representation or warranty, express or implied, is made in this regard. Any use of o
3、r reliance on this document shall constitute an acceptance thereof “as is” and be subject to this disclaimer. Copyright 1998 by AERONAUTICAL RADIO, INC. 2551 Riva Road Annapolis, Maryland 21401 ARINC SPECIFICATION 404A AIR TRANSPORT EQUIPMENT CASES AND RACKING Prepared by the Airlines Electronic Eng
4、ineering Committee Specification 404AApproved by the Airlines Electronic Engineering Committee:November 8, 1973 ii FOREWORD Activities of AERONAUTICAL RADIO, INC. (ARINC) and the Purpose of ARINC Reports and Specifications Aeronautical Radio, Inc., is a corporation in which the United States schedul
5、ed airlines are the principal stockholders. Other stockholders include a variety of other air transport companies, aircraft manufacturers and non-U.S. airlines. Activities of ARINC include the operation of an extensive system of domestic and overseas aeronautical land radio stations, the fulfillment
6、 of systems requirements to accomplish ground and airborne compatibility, the allocation and assignment of frequencies to meet those needs, the coordination incident to standard airborne communications and electronics systems and the exchange of technical information. ARINC sponsors the Airlines Ele
7、ctronic Engineering Committee (AEEC), composed of airline technical personnel. The AEEC formulates standards for electronic equipment and systems for the airlines. The establishment of Equipment Characteristics is a principal function of this Committee. It is desirable to reference certain general A
8、RINC Specifications or Reports which are applicable to more than one type of equipment. These general Specifications and Reports may be considered as supplementary to the Equipment Characteristics in which they are referenced. They are intended to set forth the desires of the airlines pertaining to
9、components and general design, construction and test criteria, in order to insure satisfactory operation and the necessary interchangeability in airline service. The release of a Specification or Equipment Characteristic should not be construed to obligate ARINC or any airline insofar as the purchas
10、e of any components or equipment is concerned. An ARINC Report (Specification or Characteristic) has a twofold purpose, which is: (1)To indicate to the prospective manufacturers of airline electronic equipment the considered opinion of the airline technical people, coordinated on an industry basis,
11、concerning requisites of new equipment, and (2)To channel new equipment designs in a direction which can result in the maximum possible standardization of those physical and electrical characteristics which influence interchangeability of equipment without seriously hampering engineering initiative.
12、 ARINC SPECIFICATION 404-A TABLE OF CONTENTS -iii- ITEMSUBJECTPAGE CHAPTER 1GENERAL CONSIDERATIONS 1.0General Considerations1 1.1Purpose and Use of this Specification1 1.2Origin of the ATR Unit Case Size and Mounting1 1.3ARINC Standard Case Designations1-2 1.4Index Coding2 CHAPTER 2ATR SYSTEM MECHAN
13、ICAL DESIGN 2.0ATR System Mechanical Design3 2.1Box Outline Dimensions3 2.1.1Projections on the Front3 2.1.2Projections on Other Faces of Equipment3 2.2Weight and Center of Gravity Limits3 2.3Box/Rack Mounting System3 2.3.1Hold-Down, Type A3-4 2.3.2Hold-Down, Type B4 2.3.3Hold-Down, Type C4 2.4Rear
14、Hold-Down, (Rack)4 2.5Connector Location/Relationship4-5 2.5.1MIL-C-81659 Connector Usage5 2.6Indexing Pin Use5-6 2.7Deflection of Box/Rack6 CHAPTER 3ELECTRICAL CONNECTOR USAGE 3.0Electrical Connector Usage7 3.1Connector Selection7 3.2Connector Configurations7 3.3Connector Index Pin Coding7-8 CHAPTE
15、R 4STANDARDIZED SPACING OF ADJACENT EQUIPMENT UNITS 4.0Standardized Spacing of Adjacent Equipment Units9 CHAPTER 5EQUIPMENT COOLING AND DESIGN 5.0Equipment Cooling and Design10 5.1Cooling Interface10 5.1.1Types of Equipment Cooling10 5.1.1.1Type “A” Cooling (Flow-Through)10 5.1.1.2Type “B” Cooling (
16、Natural Convection)10-11 5.1.2Standard Air Flow Rate11 5.1.3Pressure Drop11 5.1.4Mechanical Interface11 5.1.5Thermal Interface11-12 5.2Design Guidance and Recommended Practices for Thermal Management12 5.2.1Guidance for Equipment Designers12 5.2.1.1Equipment Design Environment Temperatures12 5.2.1.2
17、Type “A” Cooling System Design Standards12-13 5.2.1.3Equipment Thermal Management Appraisal13 5.2.1.4Installation Interface Design Data13-14 5.2.2Guidance for Aircraft Designers14 5.2.2.1Aircraft Cooling System Design14 5.2.2.2Ground Operation14 5.2.2.3Flight Operation14 5.2.2.4Equipment Compartment
18、 Thermal Control14 5.2.2.5Indication of Airflow14 5.2.2.6Supplemental Cooling14 5.2.2.7Contamination14-15 5.2.2.8Maintainability15 5.2.2.9Design Data15 5.2.3Guidance for Aircraft Operators15 5.2.4Equipment Outline Drawing Data15 ARINC SPECIFICATION 404-A TABLE OF CONTENTS -iv- ITEMSUBJECTPAGE CHAPTE
19、R 6ELECTRICAL GUIDANCE FOR EQUIPMENT CASE AND CHASSIS GROUND 6.0Electrical Guidance for Equipment Case and Chassis Ground16 6.1Equipment Performance16 6.2Equipment Protection16 6.3Personnel Protection16 6.4Selection of Hardware16 6.5Electrical Bonding and Ground Design Considerations16 ATTACHMENT 1S
20、TANDARD ATR CASE DIMENSIONS18-25 ATT-1-Fig. 1Basic Dimensions of Standard ATR Cases18 ATT-1-Fig. 2Optional Projections on Front, Bottom, Top and Sides19 ATT-1-Fig. 3Optional Front Face Forward Projections20 ATT-1-Fig. 4Optional Projections on Rear of Case21 ATT-1-Fig. 5Outline of Standard Case to Wh
21、ich All Optional Projections Have Been Added22 ATT-1-Fig. 6ATR Size Dimensions23 ATT-1-Fig. 7Typical Unit of Irregular Shape Conforming to ARINC 404A24 ATT-1-Fig. 8Unit Deflection Criteria25 ATTACHMENT 2HOOK DETAILS AND INSTALLATION26 ATTACHMENT 3THUMBSCREW DETAILS AND INSTALLATIONS27 ATTACHMENT 4LE
22、VER LATCH HANDLE INSTALLATIONS - TYPE “B” HOLD-DOWN28 ATTACHMENT 5ADJUSTABLE COMPENSATING KEEPER INSTALLATION29 ATTACHMENT 6BASIC DIMENSIONS OF INSERTER/EXTRACTOR30 ATTACHMENT 7CONNECTOR LOCATIONS31-34 ATT-7-Fig. 1Connector Locations31 ATT-7-Fig. 2Connector Locations32 ATT-7-Fig. 3Table I33 ATT-7-Fi
23、g. 4Notes33-34 ATTACHMENT 8SPRING LOADED HOLD-DOWNS35-36 ATT-8-Fig. 1Detail of Pin 1/4 ATR Boxes Only35 ATT-8-Fig. 2Clearance Holes for Rear Hold-Down Pins36 ATTACHMENT 9UNIT COOLING AIR OPENINGS37 ATTACHMENT 10WEIGHT AND CENTER OF GRAVITY LIMITS38 ATTACHMENT 11STANDARD ATR TRAY AND SEAL DIMENSIONS3
24、9-42 ATT-11-Fig. 1Top, Side and Front Views39 ATT-11-Fig. 2Cross Section and Dimensions40 ATT-11-Fig. 3General Notes for ATT-1141 ATT-11-Fig. 4Tray Deflection Criteria42 ATTACHMENT 12STANDARD SPACING OF ADJACENT EQUIPMENT UNITS (FRONT VIEW)43 ATTACHMENT 13CONNECTOR ENGAGING POSITION MIL-C-8165944 AT
25、TACHMENT 14MIL-C-81659 CONNECTOR CONFIGURATIONS45-46 ATT-14-Fig. 1Notes46 ATTACHMENT 15INDEX PIN CODING47 ATTACHMENT 16CRITERIA FOR CONNECTOR SELECTION48-49 ATTACHMENT 17PROCEDURES FOR APPRAISAL OF EQUIPMENT COOLING50-54 ATT-17.1Purpose of This Attachment50 ATT-17.2Appraisal Setup50 ATT-17.3Instrume
26、ntation50 ATT-17.3.1Instrumentation Methods50 ATT-17.3.2Instrumentation50-51 ATT-17.3.3Selection of Instrumented Parts51 ATT-17.3.4Equipment Functional Measurements51 ATT-17.4Unit Heat Dissipation Appraisal51 ATT-17.5Equipment Appraisal Procedure51 ATT-17.5.1Type A Classification (Flow-Through) Unit
27、 Test Configuration51 ATT-17.5.2Type B Classification (Natural Convection) Unit Test Configuration51 ATT-17.5.3Appraisal Procedure52 ATT-17.5.3.1Thermal Appraisal52 ATT-17.5.3.2Pressure Drop Appraisal52 ATT-17-Fig. 1ARINC Standard Test Chamber Schematic Type “A” (Draw Through) Configuration53 ATT-17
28、-Fig. 2Test Equipment Configuration and Instrumentation Location Dimensions54 ARINC SPECIFICATION 404-A TABLE OF CONTENTS -v- ITEMSUBJECTPAGE APPENDIX 1RE-DEFINITION OF THE ACRONYM “ATR RACKING” TO MEAN “AUSTIN TRUMBULL RADIO RACKING”55-57 APPENDIX 2ELECTRICAL BONDING PRACTICES58-69 APPENDIX 3CHRONO
29、LOGY OF THE ARINC RACKING SYSTEM70-82 APPENDIX 4HISTORICAL CHRONOLOGY OF ARINC CONNECTORS83-85 APPENDIX 5EXCERPTS FROM MIL-C-81659A AND RELATED DOCUMENTS86-121 APPENDIX 6USAGE OF DPA then, in 1949, it was the standard for joint Army Navy use, and eventually it became MIL-C-172. But few of the import
30、 dimensions and interfacing details were tied down adequately until ARINC Spec 404 was published in 1956. The correct meaning of term “ATR” was somewhat in doubt during the first 27 years of ATR Racking use but this was resolved by formal action of AEEC on April 12, 1967 by decree that ATR “traditio
31、nally” will have meant “Austin Trumbull Radio,” retroactive to April 15, 1940. The record of this action and the early historical chronology of the Austin Trumbull Radio Racking on which the action was based is contained in Appendix 1. 1.3 ARINC Standard Case Designations The ATR case sizes are desi
32、gnated as a fraction of a basic 1 ATR case size in width. One standard height is provided with two lengths, a long and a short which should be stated. 1/2 height is referred to as a “Dwarf” ATR. This designation does not cover such things as type of hold- down, connectors, or type of cooling needed.
33、 “Elfin” modules which have utility for packaging of equipment too small to fit in with the regular ATR concept are described in Appendix 7. The Elfin Module hold-down design is not compatible with the ATR concept and therefore the Elfin is treated separately in an appendix to 404A. “Tall” boxes suc
34、h as specified in ARINC Characteristic 561-INS, are not encouraged by 404A, but where the maximum “H” dimension given in Attachment 1-Fig. 1 must be violated for equipment reasons, it is suggested that the maximum shown in note 4 of Attachment 1-Fig. 6 be adhered to. It must be recognized that the n
35、ormal standard height was arrived at originally to accommodate the vertical spacing of the horizontal radio rack shelving in airplanes. Therefore manufacturers exceeding the standard incur the risk of finding their equipment will not fit in the aircraft. ARINC SPECIFICATION 404A - Page 2 Chapter 1 -
36、 GENERAL CONSIDERATIONS (Contd) 1.3 Case Designations (Contd) Case sizes should be designated as in the following example: ARINC 404A -ATRShort Dwarf Dwarf, Height (Blank for Standard, Height) Tall, Height Long, Length Short, Length unit form factor nominal width of the unit expressed as a fraction
37、of 1 ATR case to indicate compliance with ARINC 404A Spec. NOTE: The total assembled width of any group of cases, including the racking, should be equal to other groups of cases and racking having arithmetic sums of their designations; examples are: (1/4 ATR + 3/4 ATR) = (3/8 ATR + 1/4 ATR + 3/8 ATR
38、) = (1/2 ATR + 1/4 ATR + 1/4 ATR) = 1 ATR = etc. 1.4 ARINC Equipment Characteristics A specification to which equipment is being designed and which includes performance, environment and other necessary design features and - to which an ARINC Characteristic number is assigned or contemplated - is ref
39、erred to in this document as an Equipment Characteristic. The Equipment Characteristic shall, as the top control document for a unit, define design standards for all equipment of that characteristic. Because of the many variables and alternative methods of design and construction it is necessary for
40、 the Equipment Characteristic to be specific in these areas. It is not sufficient to merely state “rack to be in accordance with ARINC Specification 404A.” Equipment design details to be specified by the ARINC Characteristic are as follows: a) Case Size b) Unit Hold Down Configuration c) Connector C
41、onfiguration (including Index Coding) 1.4 ARINC Equipment Characteristics (Contd) d) Unit Maximum Allowed Heat Dissipation e) Unit standard cooling method; Type A (flow through) or Type B (natural convection) f) Type A unit maximum cooling airflow rate, based on the maximum allowed heat dissipation.
42、 The standard cooling rate should only be exceeded for extraordinary circumstances. g) Type A unit maximum P at the maximum allowed cooling rate, not to exceed 1.0 inch of water. 1.5 Index Coding In order to preserve the unique identity of avionics equipment having similar racking and electrical con
43、nectors, a system of mechanical indexing at the box/rack interface is provided in this spec in Section 2.6, Section 3.3, and Attachment 15. ARINC SPECIFICATION 404A - Page 3 Chapter 2 - ATR SYSTEM MECHANICAL DESIGN 2.0 ATR System Mechanical Design It must be emphasized that in establishing standardi
44、zed case sizes for airline use, it is expected that an equipment unit built in a particular case size by one manufacturer will fit a mounting made by another manufacturer. Similarly, all equipment made to the same ARINC Equipment Characteristic should utilize the specified case size and, even though
45、 made by different manufacturers, should be interchangeably usable in equipment mountings or radio racks made by other manufacturers. 2.1 Box Outline Dimensions The overall dimensions for each of the standard ATR case sizes are given in Attachment 1, “Standard ATR Case Sizes.” 2.1.1 Projections on t
46、he Front Projections on the front, hereby defined as surface -A- in Attachment 1, should not exceed 2.500 (43.5 mm) inches forward of the front face. These projections include handles in the installed positions, hold-down devices, and any installed mating aircraft cable connectors. Front connectors
47、for other than test set purposes are discouraged inasmuch as they compromise the concept of quick removal of equipment for maintenance. This front projection limitation is considered important because of the necessity of providing complete enclosures around equipment racks in many aircraft. An abnor
48、mal front projection might preclude the use of that equipment without extensive modification to the enclosure. 2.1.2 Projections on Other Faces of Equipment There should be no projections on other faces of the equipment which exceed the allowable envelope for the stated ATR case size shown in Attach
49、ment 1. Projections, such as screw heads or louvers, which are within the specified envelope should utilize rounded edges so that they will not catch on edges of rack structure adjacent to the equipment unit as the unit is moved in and out of the rack. Caution: The rather complex envelope dimensions given for the various equipment case sizes in Attachment 1 have been arrived at over the years because of equipment case envelope “nibbling” by equipment manufacturers who persist in adding external sc
链接地址:https://www.31doc.com/p-3729561.html