Lunar Module Electrical Power SystemDesign ConsiderationsDesign Considerations
and Failure Modes
ObjectivesObjectivesjj
• Explain the redesign considerations
• Describe the in-flight failures
• Describe the lessons learned
OverviewOverviewFor detail - view slides under references
BatteriesBatteriesFor detail - view slides under references
Descent Battery Testing FailuresDescent Battery Testing Failures
Weld CracksWeld Cracks
Descent Battery Testing Failures Descent Battery Testing Failures ---- ContinuedContinued
Descent Batteries InDescent Batteries In--Flight FailuresFlight Failures
Apollo 13: Electrolyte LeakApollo 13: Electrolyte Leak•• Apollo 13: Electrolyte LeakApollo 13: Electrolyte Leak
•• Apollo 17: TransducerApollo 17: Transducer
Ascent Battery Testing FailuresAscent Battery Testing Failures
Ascent Battery In-Flight Failures
•• Apollo 14: UndervoltApollo 14: Undervolt
Explosive Device Battery Testing FailuresExplosive Device Battery Testing Failures
Explosive Device Battery InExplosive Device Battery In--Flight FailuresFlight Failures
•• No InNo In--Flight FailuresFlight Failures
Electrical Control AssembliesElectrical Control Assemblies
Ascent Electrical Control Assembly LocationsAscent Electrical Control Assembly Locations
Feeder Feeder SystemSystem
For detail - view slides under references
SystemSystem
Relay Junction Box &Relay Junction Box &
df ldf l
For detail - view slides under references
Deadface Relay BoxDeadface Relay Box
DC BussesDC BussesFor detail - view slides under references
AC SystemAC SystemFor detail - view slides under references
ReviewReview
• Explain the redesign considerations
• Describe the in-flight failures
• Describe the lessons learned
ReferencesReferences
Apollo Experience Report – BatteryApollo Experience Report Battery Subsystem
Apollo Experience Report Electrical WiringApollo Experience Report – Electrical Wiring Subsystem
A ll 13 Mi i R tApollo 13 Mission ReportApollo 14 Mission ReportApollo 17 Mission Report