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  • Lunar Module ECSLunar Module ECS((Environmental Control System)Environmental Control System)((Environmental Control System)Environmental Control System)

    Design Considerations & Failure ModesDesign Considerations & Failure Modes

    Part IPart I

    https://ntrs.nasa.gov/search.jsp?R=20090016294 2018-07-12T08:38:16+00:00Z

  • Objectives

    Upon completion of the lesson, the student will be able to:able to:

    Describe the Lunar Module (LM) Environmental Control ( )System (ECS) generic design considerations philosophy.

    Summarize the LM ECS general testing regime.

  • Prerequisite

    For the best understanding of this material, the student should have viewed the Lunar Module (LM) Environmental Control System (ECS) Familiarization lesson prior to viewing thisFamiliarization lesson prior to viewing this lesson.

  • Overview of LM ECS

    Oxygen Supply and Cabin Pressurization SectionAtmosphere Revitalization SectionWater Management SectionHeat Transport Section

  • Overview of LM ECS

    Oxygen Supply and Cabin P i tiPressurization Section

  • Overview of LM ECS

    Oxygen Supply and Cabin P i tiPressurization Section

  • Overview of LM ECS

    Oxygen Supply and Cabin P i tiPressurization Section

  • Overview of LM ECS

    Oxygen Supply and Cabin P i tiPressurization Section

  • Overview of LM ECS

    Atmosphere Revitalization section

  • Overview of LM ECS

    Atmosphere Revitalization section

  • Overview of LM ECS

    Atmosphere Revitalization section

  • Overview of LM ECS

    Atmosphere Revitalization section

  • Overview of LM ECS

    Atmosphere Revitalization section

  • Overview of LM ECS

    Water Management Section

  • Overview of LM ECS

    Water Management Section

  • Overview of LM ECS

    Water Management Section

  • Overview of LM ECS

    Water Management Section

  • Overview of LM ECS

    Heat Transport Section

  • Overview of LM ECS

    Heat Transport Section

  • Overview of LM ECS

    Heat Transport Section

  • Overview of LM ECS

    Heat Transport Section

  • Generic Design Considerations

    ReliabilityFlight InstrumentationModularizationThe change from fuel cells to batteries

    Conrad & Bean

  • Generic Design Considerations -- Reliability

    Reliability

    Aldrin

  • Generic Design Considerations -- Reliability

    Perfect is the enemy of good enough

    Aldrin

  • Generic Design Considerations -- Reliability

    Perfect is the enemy of good enoughRedundancy

    Aldrin

  • Generic Design Considerations -- Reliability

    Perfect is the enemy of good enoughRedundancyCause & effect analysis vs. mean time to failure

    Aldrin

  • Generic Design Considerations -- Reliability

    Perfect is the enemy of good enoughRedundancyCause & effect analysis vs. mean time to failureShelf-life control

    Aldrin

  • Generic Design Considerations -- Reliability

    Perfect is the enemy of good enoughRedundancyCause & effect analysis vs. mean time to failureShelf-life controlFailure reporting

    Aldrin

  • Generic Design Considerations Flight Instrumentation

    ReliabilityFlight Instrumentation

    Schmitt

  • Generic Design Considerations Flight Instrumentation

    Minimum needed to monitor performance

    Schmitt

  • Generic Design Considerations Flight Instrumentation

    Minimum needed to monitor performanceControl position telemetry switches

    Schmitt

  • Generic Design Considerations Flight Instrumentation

    Minimum needed to monitor performanceControl position telemetry switches

    Most not needed

    Schmitt

  • Generic Design Considerations Flight Instrumentation

    Minimum needed to monitor performanceControl position telemetry switches

    Most not neededSwitch plunger travel length

    Schmitt

  • Generic Design Considerations Flight Instrumentation

    Minimum needed to monitor performanceControl position telemetry switches

    Most not neededSwitch plunger travel length

    Schmitt

  • Generic Design Considerations Flight Instrumentation

    Minimum needed to monitor performanceControl position telemetry switches

    Most not neededSwitch plunger travel lengthDifficult to install

    Schmitt

  • Generic Design Considerations Flight Instrumentation

    Minimum needed to monitor performanceControl position telemetry switches

    Most not neededSwitch plunger travel lengthDifficult to install

    Schmitt

  • Generic Design Considerations Modularization

    ReliabilityFlight InstrumentationModularization

    Armstrong

  • Generic Design Considerations Modularization

    Modularized by subsystem

    Armstrong

  • Generic Design Considerations Modularization

    Modularized by subsystemDense packaging

    Armstrong

  • Generic Design Considerations Modularization

    Modularized by subsystemDense packagingReplacement in the field

    Armstrong

  • Generic Design Considerations The Change to Batteries

    ReliabilityFlight InstrumentationModularizationThe change from fuel cells to batteries

    Cernan & Stafford

  • Generic Design Considerations The Change to Batteries

    Change to high pressure oxygen vs. LOX

    Cernan & Stafford

  • Generic Design Considerations The Change to Batteries

    Change to high pressure oxygen vs. LOXVery high pressure/high capacity O2 tank in descent stage

    Cernan & Stafford

  • Generic Design Considerations The Change to Batteries

    Change to high pressure oxygen vs. LOXVery high pressure/high capacity O2 tank in descent stageStaging and cutter assemblies (guillotine)

    Cernan & Stafford

  • Generic Design Considerations The Change to Batteries

    Change to high pressure oxygen vs. LOXVery high pressure/high capacity O2 tank in descent stageStaging and cutter assemblies (guillotine)Interstage quick disconnects (QDs)

    Cernan & Stafford

  • Generic Design Considerations QDs

  • Generic Design Considerations QDs

    Cutoff valves not needed, as will

    t ti llautomatically seal

  • Generic Design Considerations QDs

    Cutoff valves not needed, as will

    t ti llautomatically seal

    No retention mechanismmechanism

  • Generic Design Considerations QDs

    Cutoff valves not needed, as will

    t ti llautomatically seal

    No retention mechanismmechanism

    No risk of impactNo risk of impact ignition

  • Generic Design Considerations The Change to Batteries

    Change to high pressure oxygen vs. LOXVery high pressure/high capacity O2 tank in descent stageStaging and cutter assemblies (guillotine)Interstage quick disconnects (QDs)

    Original design

    Cernan & Stafford

  • Generic Design Considerations Original QDs

  • Generic Design Considerations Original QDs

    Poppet seal was on the ascent t tistage portion

  • Generic Design Considerations Original QDs

    Exterior leak path seal was on the d t tdescent stage portion

  • Generic Design Considerations Original QDs

    Redundant seal was needed on th l l lthe glycol loop because it leakedleaked

    Not needed on the oxygen QDoxygen QD

  • Generic Design Considerations Original QDs

    Very susceptibleto installationdamage

  • Generic Design Considerations Original QDs

    Very susceptibleto installationdamageExternal leak path seal can impact here

  • Generic Design Considerations Original QDs

    Very susceptibleto installationdamagePoppet seal can be impacted by head of descent t tistage portion

  • Generic Design Considerations The Change to Batteries

    Change to high pressure oxygen vs. LOXVery high pressure/high capacity O2 tank in descent stageStaging and cutter assemblies (guillotine)Interstage quick disconnects (QDs)

    Original designFinal design

    Cernan & Stafford

  • Generic Design Considerations Final QDs

  • Generic Design Considerations Final QDs

    Built inredundancy

  • Generic Design Considerations Final QDs

    Built inredundancy

  • Generic Design Considerations Final QDs

    Built inredundancy

  • Generic Design Considerations Final QDs

    Highly resistant toinstallationdamage

    The poppet seals p ppare protectedbehind metal

  • Generic Design Considerations Final QDs

    Better protection tothe sealingsurfaces

    Exterior leak pathpseals embeddedin groovesg

  • Objectives

    Upon completion of this part of the lesson, the student will be able to:student will be able to:

    Describe the Lunar Module (LM) Environmental Control ( )System (ECS) generic design considerations philosophy.

    Summarize the LM ECS general testing regime.

  • General Testing -- Feasibility

    Feasibility

  • General Testing -- Feasibility

    FeasibilityOriginal concept to use pre-production hardware

  • General Testing -- Feasibility

    FeasibilityOriginal concept to use pre-production hardwareTests conducted on component, logic group, and system levelssystem levels

  • General Testing -- Feasibility

    FeasibilityOriginal concept to use pre-production hardwareTests conducted on component, logic group, and system levelssystem levelsPre-production hardware very much resembled eventual production hardware, reducing the need p

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