ARINC 431-1996 No Fault Found - A Case Study《个案研究未发现错误》.pdf
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1、NO FAULT FOUND - A CASE STUDYARINC REPORT 431PUBLISHED: April 1, 1996AN A DOCUMENTPrepared byAVIONICS MAINTENANCE CONFERENCEPublished byAERONAUTICAL RADIO, INC.2551 RIVA ROAD, ANNAPOLIS, MARYLAND 21401This document is based on material submitted by variousparticipants during the drafting process. Ne
2、ither AMC nor ARINChas made any determination whether these materials could besubject to valid claims of patent, copyright or other proprietaryrights by third parties, and no representation or warranty, express orimplied, is made in this regard. Any use of or reliance on thisdocument shall constitut
3、e an acceptance thereof “as is” and besubject to this disclaimer.Copyright 1996 byAERONAUTICAL RADIO, INC.2551 Riva RoadAnnapolis, Maryland 24101-7465ARINC REPORT 431 NO FAULT FOUND - A CASE STUDYPublished: April 1, 1996This Report was prepared for the Avionics Maintenance Conference by Task Group T
4、G 116 on UnverifiedRemovalsPrepared by the Avionics Maintenance Conference Steering GroupReport 431 Adopted by the AMC Steering Group: February 12, 1996Report 431 Adopted by the Industry: March 22, 1996iiFOREWORDActivities of AERONAUTICAL RADIO, INC. (ARINC)and thePurpose of ARINC Reports for Avioni
5、cs MaintenanceAeronautical Radio, Inc. is a corporation in which the United States scheduled airlines are theprincipal stockholders. Other stockholders include a variety of other air transport companies, aircraftmanufacturers and foreign flag airlines.Activities of ARINC include the operation of an
6、extensive system of domestic and overseasaeronautical land radio stations, the fulfillment of systems requirements to accomplish ground and airbornecompatibility, the allocation and assignment of frequencies to meet those needs, the coordination incident tostandard airborne communications and electr
7、onics systems and the exchange of technical information. ARINCsponsors the Avionics Maintenance Conference (AMC), composed of airline maintenance personnel. It is aninformal industry organization serving the needs of the air transport industry in matters of avionicsmaintenance. Its objectives are pr
8、omotion of improved avionics systems and equipment reliability andperformance. It is the medium of exchange of information and ideas between and among users, repair shops,installers, suppliers, manufacturers, and designers of avionics systems, equipment, and components as aprofessional approach to m
9、aintainability and maintenance practices.AMC objectives are effected through industry conferences and informal task groups who work onproblems of mutual industry concern. The services are administered by a Steering Group (composed of airtransport operator personnel in charge of avionics line mainten
10、ance, overhaul shops, and maintenanceengineering) and a Secretariat provided by ARINC.Traditionally, ARINC “Gray Cover” documents have originated within the Airlines ElectronicEngineering Committee (AEEC), another standing committee of ARINC, composed of avionics developmentengineering personnel. AE
11、EC is functionally oriented toward formulation of standards for air transportavionics equipment. Although AMC is primarily a forum for the informal exchange of logistical information,both AEEC and AMC realize that only through AMC effort can needed guidance documents concerningmaintenance engineerin
12、g be prepared because of the increased demand on AEEC for more and more newARINC airborne hardware specifications.It is desirable to reference certain general ARINC Specifications or Reports which are applicable tomore than one type of equipment. These general Specifications or Reports may be consid
13、ered assupplementary to the Equipment Characteristics in which they are referenced. They are intended to set forththe desires of the airlines pertaining to components and general design, construction and test criteria, in order toinsure satisfactory operation and the necessary interchangeability in
14、airline service. The release of aSpecification or Equipment Characteristic should not be construed to obligate ARINC or any airline insofar asthe purchase of any components or equipment is concerned.An ARINC Report (S pecification or Characteristic) has a twofold purpose which is:(1) To indicate to
15、the prospective manufacturers of airline electronic equipment the considered opinionof the airline technical people coordinated on an industry basis concerning requisites of newequipment, and(2) To channel new equipment designed in a direction which can result in the maximum possiblestandardization
16、of those physical and electrical characteristics which influence interchangeability ofequipment without seriously hampering engineering initiative.Final Report of AMC Task Group TG-116 on Unverified RemovalsiiiAMC TG-116MD-80 Proximity Switch Electronics UnitUnverified Removal Task GroupFinal Report
17、ContentsPageSection 1: Introduction and Task Group General Findings 11.1 History of the TG-116 Task Group 11.2 Organization of the Task Group Report 31.3 Task Group Organization and Activities 31.3.1 Task Group Organization 31.3.2 Task Group Investigative Methods 41.3.2.1 The Prioritization of Fligh
18、t Squawks 41.3.2.2 The Use of Airline Maintenance Databases 61.3.2.3 The Symptom/Fix Matrix 71.3.2.4 Data on Removed Proximity Sensors 81.3.2.5 Task Group Participation by Other Vendors 81.4 Task Group Conclusions 91.5 Task Group Lessons Learned 91.5.1 Most NFF problems are system problems 91.5.2 BI
19、T systems need more awareness of system interactions 101.5.3 System problems need a team solution 111.5.4 The importance of clear and accurate technical documentation 111.5.5 Potential problems in the use of ATA codes 111.5.6 Solutions to many NFF problems are alrady known, but not implemented 121.6
20、 Conclusion 121.7 Members of the TG-116 Task Group 131.8 Appendix 1: Description of Proximity Sensors and Proximity Systems 141.8.1 The Proximity Switch System 141.8.2 The Proximity Sensor 141.8.3 Proximity Sensor Failure Modes 161.8.4 Troubleshooting Proximity Sensor Problems 161.8.5 Improved Senso
21、r Troubleshooting Tool 171.9 Appendix 2: MD-80 PSEU Symptom/Fix Matrix for Jan. 90 - Sept. 90 18Final Report of AMC Task Group TG-116 on Unverified RemovalsivAMC TG-116MD-80 Proximity Switch Electronics UnitUnverified Removal Task GroupFinal ReportContents (contd)PageSection 2: Technical Findings, C
22、orrective Action and Recommendations 232.1 Stall Indication Failure 252.2 Slat Disagree 342.3 Autoslat Fail 432.4 Autospoiler “Do Not Use” 462.5 Spoiler Deployed 492.6 Rudder Travel Unrestricted 512.7 Main Gear Unsafe 532.8 Nose Gear Unsafe 552.9 Gear Door Open 592.10 Door Warning (except Cargo Door
23、) 612.11 Cargo Door Warning 622.12 Landing Gear Aural Warning 65Final Report of AMC Task Group TG-116 on Unverified Removals1Section 1Introduction, and Task Group General Findings1.1 History of the TG-116 Task GroupAn issue of great concern to the avionics maintenance community is that of unverified
24、 or “No Fault Found” removals(NFF). 1 The NFF removal refers to electronic equipment removed from an aircraft during maintenancetroubleshooting, which, when returned to the manufacturer, is tested and found to work correctly, and issubsequently returned to the airline marked “No Fault Found.” The fa
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