ARINC 836-2012 CABIN STANDARD ENCLOSURES - MODULAR RACK PRINCIPLE (MRP).pdf

1、 AN DOCUMENT Prepared by AEEC Published by AERONAUTICAL RADIO, INC. 2551 RIVA ROAD, ANNAPOLIS, MARYLAND 21401-7435 CABIN STANDARD ENCLOSURES - MODULAR RACK PRINCIPLE (MRP) ARINC SPECIFICATION 836 PUBLISHED: June 22, 2012 This document is published information as defined by 15 CFR Section 734.7 of th

2、e Export Administration Regulations (EAR). As publicly available technology under 15 CFR 74.3(b)(3), it is not subject to the EAR and does not have an ECCN. It may be exported without an export license. DISCLAIMER THIS DOCUMENT IS BASED ON MATERIAL SUBMITTED BY VARIOUS PARTICIPANTS DURING THE DRAFTI

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7、FFECT THE STATUS OF THIS DOCUMENT AS A VOLUNTARY STANDARD OR IN ANY WAY TO MODIFY THE ABOVE DISCLAIMER. NOTHING HEREIN SHALL BE DEEMED TO REQUIRE ANY PROVIDER OF EQUIPMENT TO INCORPORATE ANY ELEMENT OF THIS STANDARD IN ITS PRODUCT. HOWEVER, VENDORS WHICH REPRESENT THAT THEIR PRODUCTS ARE COMPLIANT W

8、ITH THIS STANDARD SHALL BE DEEMED ALSO TO HAVE REPRESENTED THAT THEIR PRODUCTS CONTAIN OR CONFORM TO THE FEATURES THAT ARE DESCRIBED AS MUST OR SHALL IN THE STANDARD. ANY USE OF OR RELIANCE ON THIS DOCUMENT SHALL CONSTITUTE AN ACCEPTANCE THEREOF “AS IS” AND BE SUBJECT TO THIS DISCLAIMER. 2012 BY AER

9、ONAUTICAL RADIO, INC. 2551 RIVA ROAD ANNAPOLIS, MARYLAND 21401-7435 USA Prepared by the AEEC Specification 836 Adopted by the AEEC Executive Committee May 2, 2012 ARINC SPECIFICATION 836 CABIN STANDARD ENCLOSURES MODULAR RACK PRINCIPLE (MRP) Published: June 22, 2012 ii FOREWORD Aeronautical Radio, I

10、nc., the AEEC, and ARINC Standards ARINC organizes aviation industry committees and participates in related industry activities that benefit aviation at large by providing technical leadership and guidance. These activities directly support aviation industry goals: promote safety, efficiency, regula

11、rity, and cost-effectiveness in aircraft operations. ARINC Industry Activities organizes and provides the secretariat for international aviation organizations (AEEC, AMC, FSEMC) which coordinate the work of aviation industry technical professionals and lead the development of technical standards for

12、 airborne electronic equipment, aircraft maintenance equipment and practices, and flight simulator equipment used in commercial, military, and business aviation. The AEEC, AMC, and FSEMC develop consensus-based, voluntary standards that are published by ARINC and are known as ARINC Standards. The us

13、e of ARINC Standards results in substantial technical and economic benefit to the aviation industry. There are three classes of ARINC Standards: a) ARINC Characteristics Define the form, fit, function, and interfaces of avionics and other airline electronic equipment. ARINC Characteristics indicate

14、to prospective manufacturers of airline electronic equipment the considered and coordinated opinion of the airline technical community concerning the requisites of new equipment including standardized physical and electrical characteristics to foster interchangeability and competition. b) ARINC Spec

15、ifications Are principally used to define either the physical packaging or mounting of avionics equipment, data communication standards, or a high-level computer language. c) ARINC Reports Provide guidelines or general information found by the airlines to be good practices, often related to avionics

16、 maintenance and support. The release of an ARINC Standard does not obligate any organization or ARINC to purchase equipment so described, nor does it establish or indicate recognition or the existence of an operational requirement for such equipment, nor does it constitute endorsement of any manufa

17、cturers product designed or built to meet the ARINC Standard. In order to facilitate the continuous product improvement of this ARINC Standard, two items are included in the back of this volume: An Errata Report solicits any corrections to existing text or diagrams that may be included in a future S

18、upplement to this ARINC Standard. An ARINC IA Project Initiation/Modification (APIM) form solicits any proposals for the addition of technical material to this ARINC Standard. ARINC SPECIFICATION 836 TABLE OF CONTENTS iii 1.0 INTRODUCTION . 1 1.1 Purpose and Scope . 1 1.2 Objective . 1 1.3 Related D

19、ocuments . 1 1.4 Dimensions and Tolerances 2 2.0 MODULAR RACK PRINCIPLE 3 3.0 EQUIPMENT LOCATION 4 4.0 DESIGN DESCRIPTION . 5 4.1 Rails 5 4.1.1 Equipment Installation 6 4.1.2 Equipment Bonding 8 4.1.2.1 Bonding through the Power Connector . 9 4.1.2.2 Bonding through Mechanical Mounting Provisions .

20、9 4.1.2.3 Bonding through a Bonding Strap 9 4.1.3 Bonding Measuring Point 10 4.1.4 Materials and Plating of Piece Parts . 11 4.1.4.1 Surface Treatment . 11 4.1.4.2 Material 11 4.1.5 Marking and Identification . 12 5.0 STANDARDIZED EQUIPMENT DIMENSIONS . 13 5.1 Standard Dimensions 13 5.2 Equipment Si

21、ze Referencing . 15 6.0 CONNECTORS . 16 6.1 Connector Selection 16 6.2 Electrical Interface Orientation. 16 6.3 Connector Location . 17 7.0 REQUIREMENTS . 18 7.1 Environmental Requirements 18 8.0 REUSED EQUIPMENT . 19 8.1 General . 19 8.2 Design of Adapter Plate. 19 APPENDIX APPENDIX A LIST OF ACRON

22、YMS . 20 ARINC SPECIFICATION 836 Page 1 1.0 INTRODUCTION 1.0 INTRODUCTION 1.1 Purpose and Scope The purpose of this specification is to define standard cabin equipment enclosures and provisions for equipment attachment on monuments. COMMENTARY Up until the time of this standard, it was common for se

23、veral different types of cabin equipment boxes to be installed individually along the ceiling area of an aircraft fuselage. Each type of equipment box is different in design and size. Each type uses different connectors, grounding and bonding methods, installation brackets, and installation methods

24、for structural attachment. For each of these custom installations, the equipment must be located, connected, and mounted using individually designed provisions, custom cabling, and cable routing. These custom installations result in long lead times and excessive costs. This standard was prepared to

25、address these concerns. 1.2 Objective The principal objective of ARINC Specification 836 is to provide standardized packaging of cabin systems components. This standard is intended to enable simpler installation and maintenance of cabin equipment, resulting in time and cost reduction. Specifically,

26、ARINC Specification 836 is intended to provide the following benefits: Consistent equipment attachment methods Weight savings from the removal of adapter plates for new equipment Standard equipment installation positions Reduced design effort for brackets and adapter plates Reduced integration desig

27、n efforts Improved accessibility to installation areas Quick installation at final assembly Simplified routing concept for electrical connection of equipment Optimized length for connective cable bundles. Branches from the main routing are short and easily defined. Improved maintenance for airlines

28、Improved capability for retrofit 1.3 Related Documents The latest version of the following documents applies: ARINC Specification 600: Air Transport Avionics Equipment Interfaces RTCA DO-160/EUROCAE ED-14: Environmental Conditions and Test Procedures for Airborne Equipment ISO 2768: General Toleranc

29、es - Part 1: Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications ARINC SPECIFICATION 836 Page 2 1.0 INTRODUCTION 1.4 Dimensions and Tolerances Tolerances for dimensions without individual tolerance indications are in accordance with ISO 2768-c. All dimensions includ

30、e plating or protective paint. ARINC SPECIFICATION 836 Page 3 2.0 MODULAR RACK PRINCIPLE 2.0 MODULAR RACK PRINCIPLE This specification defines a modular rack system, called Modular Rack Principle (MRP). MRP is a standardized mechanical and electrical installation principle for electrical equipment i

31、n the aircraft cabin crown area. The MRP includes standard equipment enclosures, mounting rails, and standard installation methods, including mechanical mounting and electrical bonding. The dimensions and specifications for equipment boxes and mounting rails, as well as mounting and bonding methods,

32、 are standardized in this document, allowing a homogeneous distribution of the equipment, flexible installation, and simplified reconfiguration and maintenance. Furthermore, all equipment is placed in optimal positions to reduce bundle length and simplify routing for installation. The MRP reduces in

33、stallation and maintenance cycles and eliminates the need for engineering investigations for custom installations. The MRP was developed to overcome the weight- and cost-intensive design, and time-intensive installation. The basic idea behind the MRP is to install a standard rail system in the crown

34、 area where standard cabin systems can be mounted. As shown in Figure 2-1, the MRP defines an integrated principle for attaching equipment to the standard mounting rails, which enables new equipment to be mounted without adapter plates. Existing (reused) equipment may be installed on adapter plates

35、to enable the installation on the rail system (see Figure 2-1). Figure 2-1 Modular Rack Equipment Installation Principle New Equipment Re-used EquipmentRailBracketsEquipmentEquipmentEquipment Base Plate+Integrated equipment base plate with lugsAdded adapter plate for equipment mountingAttachment Lug

36、sEquipment CoverRe-used EquipmentARINC SPECIFICATION 836 Page 4 3.0 EQUIPMENT LOCATION 3.0 EQUIPMENT LOCATION Cabin equipment should typically be located in the crown area of the aircraft. MRP rails should be installed in the over-ceiling parallel to the flight direction. Figure 3-1 shows a fuselage

37、 section with typical cabin equipment mounting arrangements. Connective cable bundles should be routed parallel to the equipment mounting rails. The equipment should be connected via branches from the main bundles. Figure 3-1 Typical Modular Rack in Crown Area RailRailsEquipmentCeilingStructureARINC

38、 SPECIFICATION 836 Page 5 4.0 DESIGN DESCRIPTION 4.0 DESIGN DESCRIPTION 4.1 Rails Rails should be installed on an as-needed basis, that is, when equipment is installed. Rails may be installed in the crown area anywhere along the length of the cabin and could be attached to frames or substructure. CO

39、MMENTARY Custom mounting brackets are considered a special case of mounting rails, but with fixed spacing of mounting holes. These brackets are considered equivalent to rails. The dimensions and spacing of mounting holes and the mounting and bonding methods described in this specification should app

40、ly. Figure 4-1 shows the mating area of the mounting interface details for the rails. Note: Only the mating area of the rails is shown in Figure 4-1. The rails will have a standard cross-sectional profile to increase their stiffness. Selection of the cross-sectional profile is at the designers discr

41、etion. The length of the rail should be related to the frame-to-frame distance (or a multiple of the frame-to-frame distance). The equipment mounting holes should have a 0.201 0.004 in (5.1 0.1 mm) diameter. The mounting hole spacing should be 1 in (25.4 mm) or a common multiple. If the mating faces

42、 are installed as independent rails (as shown in Figure 4-1), they should be installed with the help of a jig to ensure parallelism. Parallelism should be within 0.004 in (0.1 mm) based on the distance between corresponding attachment holes (see Figure 4-1 and Table 4-1). Dimensions are given in Tab

43、le 4-2. Figure 4-1 Rail Interface ARINC SPECIFICATION 836 Page 6 4.0 DESIGN DESCRIPTION Table 4-1 Attachment Point Distance Equipment size D, in. (mm) Size 1 7.4803 0.004 (1900.1) Size 2 3.1496 0.004 (800.1) Table 4-2 Rail Dimensions Dimension Rail, in (mm) E 1 0.012 (25.4 0.3) F 2 0.012 (50.8 0.3)

44、G 3 0.012 (76.2 0.3) H 0.2 0.002 (5.1 0.05) Stress calculations should be carried out for the worst case scenario of the attached equipment. The calculation should be done for the highest equipment mounting density. The weight of size 1 equipment should be a maximum of 9.93 lb. (4.5 kg). The weight

45、of size 2 equipment should be a maximum of 3.31 lb. (1.5 kg). COMMENTARY If rails are used for equipment bonding, the ampacity of the rail should be selected by the highest failure current of the assembled equipment. The rail ampacity depends on the rail section and conductivity of the selected mate

46、rial. 4.1.1 Equipment Installation The equipment base plate should have tabs on each corner with mounting holes to enable attachment to the rails (see Figure 4-2). The attachment principle consists of two elongated and two circular holes. The mounting hole dimensions and tolerances are provided in F

47、igure 4-3. Equipment should be installed to the rails with four screws, nuts, and shims (as required). Table 5-1 shows the mounting hole pattern and the dependence on the equipment size. Figure 4-2 Equipment Attachment Points ARINC SPECIFICATION 836 Page 7 4.0 DESIGN DESCRIPTION Figure 4-3 Interface

48、 Dimension and Tolerances The attachment of the equipment to the rail can be designed individually for the specific application as long as the equipment dimensions and mounting hole pattern are in accordance with this specification. A typical equipment mechanical installation is shown in Figure 4-4.

49、 The rail should be equipped with riveted self-locking nuts (e.g., NASM21070) at the applicable mounting locations, or simple self-locking screws (e.g., NAS5050) are used for equipment attachment. The equipment should be mounted using appropriate fasteners (e.g., NAS1802) and washers (e.g., NAS1149). ARINC SPECIFICATION 836 Page 8 4.0 DESIGN DESCRIPTION Screwe.g., NAS 1802Washere.g., NAS1149C0332RNute.g., NAS5050-3C orNASM21070-L3KFigure 4-4 Equipment Mounting on Rail 4.1.2 Equipment Bonding Adequate equipment b