ARINC 431:1996
ARINC 431:1996 No Fault Found - A Case Study Defines the report of the Avionics Maintenance Conference (AMC) Task Group 116 which was formed to discover the causes of "No Fault Found" in avionics equipment during test.
Table of Contents
1:IntroductionandTaskGroupGeneralFindings1.1HistoryoftheTG-116TaskGroup
1.2OrganizationoftheTaskGroupReport
1.3TaskGroupOrganizationandActivities
1.3.1TaskGroupOrganization
1.3.2TaskGroupInvestigativeMethods
1.3.2.1ThePrioritizationofFlightSquawks
1.3.2.2TheUseofAirlineMaintenanceDatabases
1.3.2.3TheSymptom/FixMatrix
1.3.2.4DataonRemovedProximitySensors
1.3.2.5TaskGroupParticipationbyOtherVendors
1.4TaskGroupConclusions
1.5TaskGroupLessonsLearned
1.5.1MostNFFproblemsaresystemproblems
1.5.2BITsystemsneedmoreawarenessofsystem
interactions
1.5.3Systemproblemsneedateamsolution
1.5.4Theimportanceofclearandaccuratetechnical
documentation
1.5.5PotentialproblemsintheuseofATAcodes
1.5.6SolutionstomanyNFFproblemsarealready
known,butnotimplemented
1.6Conclusion
1.7MembersoftheTG-116TaskGroup
1.8Appendix1:DescriptionofProximitySensorsandProximity
Systems
1.8.1TheProximitySwitchSystem
1.8.2TheProximitySensor
1.8.3ProximitySensorFailureModes
1.8.4TroubleshootingProximitySensorProblems
1.8.5ImprovedSensorTroubleshootingTool
1.9Appendix2:MD-80PSEUSymptom/FixMatrixforJan.'90-
Sept.'90
2:TechnicalFindings,CorrectiveActionand
Recommendations
2.1StallIndicationFailure
2.2SlatDisagree
2.3AutoslatFail
2.4Autospoiler"DoNotUse"
2.5SpoilerDeployed
2.6RudderTravelUnrestricted
2.7MainGearUnsafe
2.8NoseGearUnsafe
2.9GearDoorOpen
2.10DoorWarning(exceptCargoDoor)
2.11CargoDoorWarning
2.12LandingGearAuralWarning