1、 PORTABLE MAINTENANCE ACCESSTERMINAL (PMAT)ARINC REPORT 644PUBLISHED: MAY 25, 1993AN DOCUMENTPrepared byAIRLINES ELECTRONIC ENGINEERING COMMITTEEPublished byAERONAUTICAL RADIO, INC.2551 RIVA ROAD, ANNAPOLIS, MARYLAND 21401This document is based on material submitted by variousparticipants during the
2、 drafting process. Neither AEEC nor ARINChas made any determination whether these materials could besubject to claims of patent or other proprietary rights by thirdparties, and no representation or warranty, express or implied, ismade in this regard. Any use of or reliance on this document shallcons
3、titute an acceptance hereof “as is“ and be subject to thisdisclaimer.Copyright 1993 byAERONAUTICAL RADIO, INC.2551 Riva RoadAnnapolis, Maryland 21401-7465 USAARINC REPORT 644PORTABLE MAINTENANCE ACCESSTERMINAL (PMAT)Published: May 25, 1993Prepared by the Airlines Electronic Engineering CommitteeRepo
4、rt 644 Adopted by the Airlines Electronic Engineering Committee: March 19, 1993Report 644 Adopted by the Industry: April 23, 1993FOREWORDActivities of AERONAUTICAL RADIO, INC. (ARINC)and thePurpose of ARINC Reports and SpecificationsAeronautical Radio, Inc., is a corporation in which the United Stat
5、es scheduled airlinesare the principal stockholders. Other stockholders include a variety of other air transportcompanies, aircraft manufacturers and foreign flag airlines.Activities of ARINC include the operation of an extensive system of domestic andoverseas aeronautical land radio stations, the f
6、ulfillment of systems requirements frequencies tomeet those needs, the coordination incident to standard airborne communications and electronicssystems and the exchange of technical information. ARINC sponsors the Airlines ElectronicEngineering Committee (AEEC), composed of airline technical personn
7、el. The AEEC formulatesstandards for electronic equipment and systems for the airlines. The establishment of EquipmentCharacteristics is a principal function of this Committee.It is desirable to reference certain general ARINC Specifications or Reports which areapplicable to more than one type of eq
8、uipment. These general Specifications or Reports may beconsidered as supplementary to the Equipment Characteristics in which they are referenced. Theyare intended to set forth the desires of the airlines pertaining to components and general design,construction and interchangeability in airline servi
9、ce. The release of a Specification orEquipment Characteristic should not be construed to obligate ARINC or any airline insofar asthe purchase of any components or equipment is concerned.An ARINC Report (Specification or Characteristic) has a twofold purpose, which is:1) To indicate to the prospectiv
10、e manufacturers or airline electronic equipment theconsidered opinion of the airline technical people coordinated on an industry basisconcerning requisites of new equipment, and2) To channel new equipment designs in a direction which can result in the maximumpossible standardization of those physica
11、l and electrical characteristics which influenceinterchangeability of equipment without seriously hampering engineering initiative.iiARINC REPORT 644TABLE OF CONTENTSITEM SUBJECT PAGE1.0 INTRODUCTION AND DESCRIPTION 11.1 Purpose of this Document 11.2 Description 11.3 Interchangeability 11.4 Regulato
12、ry Approval 11.5 Definition of Terms Used in this Document 11.6 Related Documents 12.0 INTERCHANGEABILITY STANDARDS 22.1 Introduction 22.2 Form Factor, Connector, and Pin Indexing 22.3 Standard Interwiring 22.4 Electrical Power 22.5 Common Ground 22.6 Test and Maintenance 23.0 BASIC CAPABILITIES 33.
13、1 General Description 33.2 Basic Functions 33.2.1 Basic Maintenance Functions 33.2.2 User Terminal Characteristics 33.2.3 Data Access 33.2.4 BITE Monitoring 33.2.5 Printed (Hardcopy) Output 33.2.6 Configuration Identification 33.3 Processing Platform 43.3.1 Software 43.3.1.1 Operating Environment 43
14、.3.1.2 OSI Communications Protocol 43.3.1.3 X-Windows 43.3.2 Hardware 43.3.2.1 Battery Power Supply 43.3.2.2 Processor/Memory 43.3.2.3 Data Input Device/Display 44.0 OPTIONAL CAPABILITIES 54.1 General Description 54.2 PMAT Communications 54.3 Data Loading 54.4 Other Peripherals 54.5 Special Purpose
15、Functions 54.6 Battery Charger 55.0 COMMUNICATIONS PROTOCOL 65.1 General Description 65.2 Protocol Architecture 65.2.1 Physical Layer 65.2.2 Data Link Layer 65.2.3 Network Layer 65.2.4 Transport Layer 66.0 TEST AND MAINTENANCE 76.1 General Description 76.2 Self Test 76.3 Hardware 76.3.1 Power Supply
16、 76.3.2 Processor 76.3.3 Memory 76.3.4 User Input Device 76.3.5 Display 76.4 Fault Reporting 7iiiARINC REPORT 644TABLE OF CONTENTSITEM SUBJECT PAGEATTACHMENTS1 Definition of Terms 82 Portable Maintenance Access Terminal Systems Interfaces Alternative LRU Implementation 92-1 Portable Maintenance Acce
17、ss Terminal Systems Interfaces Standard LRM Implementation 103 Portable Maintenance Access Terminal Aircraft Interface Plug Connector 113-1 Portable Maintenance Access Terminal Aircraft Interface Port Connector 123-2 Portable Maintenance Access Terminal Aircraft Interface Port Connector Insert Layou
18、t 13ivARINC REPORT 644 - Page 11.0 INTRODUCTION AND DESCRIPTION1.1 Purpose of this DocumentThis document contains the electrical interface definition,and a functional description of a portable maintenanceaccess terminal (PMAT). The intent of this document isto provide general and specific design gui
19、dance for thedevelopment of a PMAT primarily for airline use. Thisdocument describes the aircraft interface, operationalcapabilities, and the standards necessary to achieveinteroperability with ARINC 624 Onboard MaintenanceSystems (OMS) and ARINC 649 Electronic LibrarySystems (ELS).This characterist
20、ic defines the interface protocol, and thebasic and optional PMAT functions. The PMAT should bedesigned to operate in an ATN-compliant environment.1.2 DescriptionThe PMAT is a portable control and display devicesuitable for the airplane maintenance environment thatallows remote access to OMS and ELS
21、. The PMATinterfaces with on-board systems through ports locatedthroughout the airplane. Additional capabilities areselectable options that will be determined by economicsand practicality.1.3 InterchangeabilityOne of the primary functions of an ARINC Characteristicis to specify, in addition to perfo
22、rmance parameters, theinterchangeability desired by the airline users.Interchangeability is the ability for equipment designed bydifferent manufacturers to be used for various aircraft .While every effort is made to completely define all theinterface requirements, a few unanticipated problems mayari
23、se in the equipment development and integrationprograms. Manufacturers are encouraged to bring thesediscrepancies to the attention of the AMC/AEEC staff sothat every effort can be made to achieveinterchangeability.Airline users desire that evolutionary improvements andinclusions of additional functi
24、ons do not violate thestandards set forth in this document. Provisions to ensureforward looking generation interchangeability are includedin this document to guide the manufacturer in futuredevelopments.1.4 Regulatory ApprovalThe PMAT should meet all applicable Federal AviationAdministration (FAA),
25、European Joint Aviation Authority(JAA), Federal Communications Commission (FCC), andany other customer airlines regulatory authority uniquerequirements. This document does not and cannot setforth the specific requirements that equipment must meetto assure approval. Such information should be obtaine
26、dfrom the regulatory agencies themselves.1.5 Definition of Terms Used in This DocumentDefinition of terms and abbreviations used in thisdocument are provided in Attachment 1.1.6 Related DocumentsThe latest revision of the following documents arepertinent to the design and development of a PMAT which
27、meets the guidelines set forth in this document.ARINC Specification 600, “Air Transport AvionicsEquipment Interfaces.“ARINC Report 604, “Guidance for Design and Use ofBuilt-In Test Equipment (BITE).ARINC Specification 609, “Design Guidance for AircraftElectrical Power Systems.“ARINC Specification 61
28、5, “Airborne Computer HighSpeed Data Loader.“ARINC Characteristic 624, “Design Guidance for On-board Maintenance System (OMS).“ARINC Project Paper 636, “On-board Local Area Network(OLAN).“ARINC Project Paper 637, “InternetworkingSpecification.“ARINC Project Paper 638, “Upper Layer Specification.“ARI
29、NC Project Paper 646, “Ethernet LAN.“ARINC Project Paper 649, “Design Guidance forElectronic Library System (ELS).“ARINC Project Paper 744A, “Full-Format Printer.“ARINC Project Paper 748, “Communication ManagementUnit.“ARINC Project Paper XXX, “Data Loader TBD.“ANSI X3.131-199x, “Small Computer Syst
30、em Interface -2 (SCSI-II).“ANSI X3H3.6 Part 4, “X-Windows over OSI.“ISO 7498, “Open Systems Interconnection ReferenceModel“ISO 8824, “Information Processing System - Open SystemInterconnection - Specification of Abstract SyntaxNotation One (ANSI.1).“ISO 8825, “Information Processing System - Open Sy
31、stemInterconnection - Specification of Basic Encoding Rulesfor Abstract Syntax Notation One (ANSI.1).“RTCA/DO-205, “Design Guidelines and RecommendedStandards to Support Open System Interconnection forAeronautical Mobile Digital Communications.“ARINC REPORT 644 - Page 22.0 INTERCHANGEABILITY STANDAR
32、DS2.1 IntroductionThis section sets forth the form factor, interwiring, inputand output interfaces and power characteristics desired forthe PMAT. Attachment 2 outlines systems using eitherLRU or LRM components with a PMAT. These standardsshould permit the parallel but independent design ofcompatible
33、 equipment.2.2 Form Factor, Connector, and Pin IndexingThe PMAT is a portable user interface device intended tobe hand carried to work sites around the aircraft. As suchthe physical characteristics are not as critical as forcomponents installed on-board the aircraft. Physical sizeand weight restrict
34、ions on the PMAT will be determinedby the airline and PMAT manufacturer.COMMENTARYThe PMAT should be designed to provide anadequate input/output capability and still be asphysically small and light weight as possible in orderto allow access to all work areas. A PMAT that iseither difficult to use, o
35、r difficult to bring into theavailable work space, will not be used.The PMAT interface to the airplane should be a connectorwith pin indexing as defined in Attachment 3.COMMENTARYThe airlines desire a standard interface between thePMAT and the on-board systems in order toeliminate the need for physi
36、cally different interfacesfor different aircraft. The connector and pinoutshould be the same for all manufacturers aircraft bothfor new models and for retrofit on older models.The PMAT should meet all mechanical, electrical, andenvironmental requirements defined for all potential workareas in and ar
37、ound the aircraft.COMMENTARYThe work areas appropriate for the PMAT will differon different models of aircraft. However, it can beexpected that the work environment will includevapor areas, high temperatures, moisture, lowtemperatures, and a variety of different fluids andchemicals used around aircr
38、aft. Since the PMAT isprimarily for line support it will be exposed to allsorts of weather and will be required to be usable inbright sunlight as well as at night. It should also beexpected that the PMAT will be accidently droppedby the user.2.3 Standard InterwiringThe PMAT communications with the o
39、n-board systemsshould be compliant with ARINC Project Paper 646.ARINC Project Paper 646 is based on an IEEE 802.3Ethernet LAN. The physical connection should be basedon a shielded 10BaseT physical connection standard.2.4 Electrical PowerThe PMAT should be capable of being powered by eithera self-con
40、tained rechargeable battery or 115 VAC 400 Hzaircraft power through the aircraft connector. In addition,the PMAT should be capable of accepting commercialpower of 50-60 Hz, 100-250 VAC. A separate powercable may be used for commercial power.COMMENTARYThe PMAT power supply should be designed tosuppor
41、t the airlines maintenance environment in allsituations. A PMAT with both a battery and anelectronic power supply can be used in the hangar,shop, on the flight line, with powered or unpoweredaircraft, and to support retrofit older model planes.COMMENTARYSince some aircraft may not have 115 VAC avail
42、ableat the connectors, consideration should be given tomaking the internal PMAT battery easily replaced, inorder that one or more spare batteries can becharging outside of the PMAT. During periods ofhigh activity a discharged battery could be swappedfor a fully charged one, allowing continued use of
43、 thePMAT.PMAT power consumption should not exceed 50 watts.2.5 Common GroundThe wire connected to the PMAT connector pin labeled“Chassis Ground“ is not intended as a common return forheavy AC currents.2.6 Test and MaintenanceThe PMAT should contain self-test capability whichmonitors and displays its
44、 own health. The PMAT shouldnot be considered an ARINC Report 624 OMS membersystem.ARINC REPORT 644 - Page 33.0 BASIC CAPABILITIES3.1 General DescriptionThis section describes the functional aspects of theequipment which are considered to be included in thebasic PMAT. The objective of the PMAT is to
45、 providethe line mechanic with a portable remote user interfacedevice to support maintenance activities in locations notconvenient to the on-board Maintenance Access Terminal(MAT).Ports should be provided for the PMATs to facilitatemaintenance at multiple locations throughout the aircraft.COMMENTARY
46、The portability of the PMAT allows the maintenancetechnician to “take the OMS on-site.“ For example,if maintenance action is required on the aircraftbrakes, the PMAT could be connected to the OMSport located in an adjacent wheel well. From thislocation, a test could be conducted to isolate the fault
47、,appropriate maintenance action could be taken, andfinally, the test could be conducted again to verifythe maintenance action.Ports may be provided at service interphone panelswhose locations are already in place. Commercialcomputers with a suitable OMS/ELS interface shouldbe considered for use as P
48、MATs.The PMAT should not adversely affect on-board aircraftsystems.3.2 Basic FunctionsThe basic capability of the PMAT provides the equivalentfunctionality of the MAT at remote sites around theaircraft. This functionality may be provided by thePMAT operating as an X-server terminal communicatingvia
49、the network interface to the on-board X-client and asa workstation hosting applications that communicate viathe network interface for data from the aircraft massstorage and with other on-board systems.When operating as an X-terminal, the functionality of thePMAT is controlled by the X-client. When operating asa workstation, the application software that is loaded onthe PMAT will determine its functional capability. Thisapplication software may be resident in the PMAT or bedownloaded to the PMAT across the ARINC 646 LANfrom the ELS.3.2.1 Basic Maintenance FunctionsThe basic maintenance f
