WE PROPOSE TO DEVELOP A REVOLUTIONARY ORGANIC COMPOSITIONAL ANALYZER (OCA) BASED UP-ON THE ONLY MASS SPECTROMETER SPECIFICALLY DESIGNED FOR THE HARSH ENVIRONMENT AT EUROPA MASPEX-EUROPA CLIPPER (FROM SOUTHWEST RESEARCH INSTITUTE SWRI). THIS WORK OPTIMIZES AN OCA FOR LANDED SAMPLE ANALYSIS BY COMBINING THE MATURITY OF MASPEX DEVELOPMENT FOR EUROPA CLIPPER WITH NOVEL MICRODEVICE GAS CHROMATOGRAPH AND SAMPLE PREPARATION SYSTEMS DEVELOPED BY THE UNIVERSITY OF MICHIGAN AND JHU-APL RESPECTIVELY. THE COMBINED INSTRUMENT MASPEX-ORCA (MASS SPECTROMETER FOR PLANETARY EXPLORATION-ORGANIC COMPOSITION ANALYZER) HAS EXCEPTIONAL CAPABILITIES TO SEARCH FOR ORGANIC SIGNATURES OF LIFE; ENABLE ASSESSMENTS OF THE CHEMISTRY OF THE LANDER ENVIRONMENT INCLUDING MOLECULAR INDICATORS OF HABITABLE CONDITIONS; AND UNLOCKS THE POWER OF ISOTOPE BIOGEOCHEMISTRY ON THE SURFACE OF AN ICY WORLD WITH THE BASELINE HIGH-RESOLUTION CONFIGURATION. MASS SIZE POWER AND DATA RESOURCES WILL ULTIMATELY LIMIT THE SCIENCE THAT CAN BE ACHIEVED BY ANY OCA ONBOARD EUROPA LANDER. THE MASPEX-ORCA INVESTIGATION DEFINES BASELINE AND THRESHOLD CONFIGURATIONS BASED ON THE GUIDANCE OF THE EUROPA LANDER STUDY 2016 REPORT AND 2018 EUROPA LANDER ARCHITECTURE UPDATE. EACH CONFIGURATION FEATURES A HIGH TECHNOLOGY READINESS LEVEL (TRL) MASS SPECTROMETER EITHER MASPEX (BASELINE FROM SWRI) OR NEUTRAL GAS MASS SPECTROMETER (NGMS THRESHOLD FROM UNIVERSITY OF BERN) COUPLED TO STATE-OF-THE-ART MICROFLUIDICS AND A MICRODEVICE MULTI-DIMENSIONAL GAS CHROMATOGRAPH (GC-GC). THE THRESHOLD INVESTIGATION SELECTS THE HIGHEST PRIORITY OBJECTIVES FROM THE SDT REPORT THAT CAN BE ADDRESSED USING A MEDIUM RESOLUTION MASS SPECTROMETER. HOWEVER ACCESS TO HIGH-PRECISION ISOTOPIC RATIOS (BASELINE INVESTIGATION) OPENS A MUCH WIDER WINDOW INTO THE POSSIBLE BIOLOGICAL ORIGINS OF MOLECULAR SPECIES INCLUDING CUTTING-EDGE POSITION-SPECIFIC ISOTOPIC ANALYSES. OUR PROGRAM LEVERAGES THE HIGH MATURITY OF THESE MASS SPECTROMETERS APPLIES THEM TO THE RESOURCE-INTENSIVE ENVIRONMENT AND COMBINES THEM WITH DEVELOPING TECHNOLOGIES TO SEARCH FOR BIOSIGNATURES AT EUROPA S SURFACE. THE CAPABILITIES OF BOTH GC-GC-MS SYSTEMS (INCLUDING MASS RANGE MASS RESOLUTION COMPOUND SEPARATION AND DETECTION LIMITS) TO MEET THE PROJECTED PERFORMANCE FOR ANALYZING BIOMOLECULES HABITABILITY INDICATORS AND A RANGE OF OTHER MOLECULES ARE VERIFIED BY TESTING IN YEAR 1 (Y1). ON A PARALLEL TRACK IN Y1 JHU-APL DEVELOPS A ROBOTIC MICROFLUIDICS SAMPLE PREPARATION SYSTEM. INDIVIDUAL ENGINEERING TASKS ARE ALSO COMPLETED TO ADVANCE THE TRL OF THE GC-GC AND TO MODIFY MASPEX AND NGMS TO ENSURE COMPATIBILITY WITH THE CONSTRAINTS OF A LANDED MISSION ON EUROPA. COLLABORATION WITH THE PRE-PROJECT TEAM AND OTHER INSTRUMENT TEAMS MATURES SPACECRAFT ACCOMMODATION. AN EVALUATION OF THE PERFORMANCE VERSUS RESOURCE TRADE SPACE FROM THE Y1 STUDY LEADS TO THE SELECTION OF A SYSTEM DESIGN THAT FORMS THE BASIS OF THE EUROPA LANDER OCA INSTRUMENT. THIS INSTRUMENT IS TECHNICALLY MATURED AND TESTED AS AN END-TO-END SYSTEM IN Y2. THE PROPOSED DEVELOPMENTS ARE IMPORTANT FOR MASPEX-ORCA TO REACH TRL 6 BY 2021-2022 FOR A 2026-2027 EARLIEST FLIGHT OPPORTUNITY.