Table of Contents
DOCUMENTHISTORYLOG
FOREWORD
1.SCOPE
1.1Purpose
1.2Applicability
2.APPLICABLEDOCUMENTS
2.1General
2.2GovernmentDocuments
2.3Non-GovernmentDocuments
2.4OrderofPrecedence
3.ACRONYMSANDDEFINITIONS
3.1Acronyms
3.2Definitions
4.REQUIREMENTS
4.1Binding/Jamming/Seizing
4.1.1Clearances
4.1.2Tolerancing
4.1.3InstallationandAdjustmentSensitivity
4.1.4LubricantCompatibility
4.1.5LubricantQuantities
4.1.6LubricantLife
4.1.7Pulleys
4.2Quick-ReleasePins
4.2.1Quick-ReleasePinswithZeroFault-Tolerance
4.2.2Quick-ReleasePinStandards
4.2.3Quick-ReleasePinAcceptanceTesting
4.2.4Quick-ReleasePinQualificationVibration
Testing
4.2.5Quick-ReleasePinQualificationThermal
Testing
4.3Springs
4.3.1SpringApplication
4.3.2SpringType
4.4Dampers
4.4.1ViscousDamperFilling
4.4.2ViscousDamperConstruction
4.4.3ViscousDamperFluidContainment
4.5Bearings
4.5.1BearingsasaCurrentPath
4.5.2BearingQuality
4.5.3BearingHertzianContactStress
4.5.4BearingHardness
4.6Switches
4.6.1InadvertentPreventionofMechanism
Actuation
4.6.2SwitchActuation
4.7FastenerRetention
4.7.1FastenerRetentionRedundancy
4.7.2StructuralFastenersSubjecttoRotation
4.7.3UseofSnapRingsandCotterPins
4.7.4UseofNon-VerifiableStructuralFastener
RetentionMethods
4.7.5LockingFeatureVerification
4.7.6StructuralFastenerTorqueSpecification
4.8PerformanceAnalysis,StrengthAnalysis,and
FractureControl
4.8.1StructuralRequirements
4.8.2MechanismStructuralInterfaceBoundary
Conditions
4.8.3StructuralIntegrityDuringStall
4.8.4MechanicalStops
4.8.5BearingPerformanceandStrengthAnalysis
4.8.6GearPerformanceAnalysis
4.8.7GearStrengthAnalysis
4.8.8InadvertentContactLoads
4.8.9PreloadedBoltCriteria
4.8.10FractureControl
4.9PositiveIndicationofStatus
4.9.1End-of-TravelStops
4.10Torque/ForceMargins
4.10.1RequiredOperatingTorque/ForceMargin
4.10.2VerificationofOperatingTorque/Force
Margins
4.10.3RequiredHoldingTorque/ForceMargin
4.10.4VerificationofHoldingTorque/Force
Margins
4.10.5RequiredDynamicTorque/ForceMargin
4.10.6VerificationofDynamicTorque/Force
Margin
4.10.7ElectricMotorActuation
4.10.8RedundantSpringActuation
4.10.9SeparationNuts
4.11Contamination
4.11.1AssemblyandHandlingRequirements
4.11.2LubricantMigration
4.11.3Dry-FilmLubricantDebris
4.11.4ViscousDamperFluidCleanliness
4.12QualificationTesting
4.12.1QualificationConfigurations
4.12.2QualificationTestingInterfaceBoundary
Conditions
4.12.3Pre-andPost-QualificationInspection
andFunctionalTesting
4.12.4QualificationLevelAdjustmentfor
Proto-FlightApproaches
4.13DesignLifeVerificationTests
4.13.1DesignLifeVerificationTestEnvironment
4.13.2TestingofMechanicalStops
4.13.3DesignLifeTestFactor
4.13.4Pre-andPost-LifeTestInspectionand
FunctionalTesting
4.13.5DesignLifeLevelAdjustmentfor
Proto-FlightApproaches
4.13.6RefurbishmentforProto-FlightApproaches
4.14AcceptanceTesting
4.14.1FunctionalTestStructuring
4.14.2InitialFunctionalTesting
4.14.3Run-InTesting
4.14.4Run-InTestDuration
4.14.5Run-InTestEnvironment
4.14.6Run-InTestMonitoring
4.14.7EnvironmentalTesting
4.14.8FunctionalTesting
4.15MechanismInstallation
4.16ExceptionsandAlternateApproaches
5.GUIDANCE
5.1ReferenceDocuments
5.2UseofQuick-ReleasePins
5.3SpringFailure
5.4FastenerPreload
5.5Torque/ForceMargin
5.6QualificationTesting
5.7DesignLifeVerificationTesting
5.8AcceptanceTestingofEVABolts
5.9Run-InTesting
5.10MIL-A-83577B
5.11KeyWordListing Abstract
Establishes common design and development requirements across National Aeronautics and Space Administration (NASA) Centers for the design of aerospace mechanisms whose correct operation is required for safety or program success.
