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AA-2 Ascent Abort-2

ABCU Auxiliary Bus Control Unit

ACM Attitude Control Motor

ADP Advanced Development Projects

AFRC Armstrong Flight 

Research Center

AI&P Assembly, Integration 

and Production

AI&T Analysis, Integration & Test

AM Abort Motor

AOS Acquisition of Signal

APS Avionics Power and Software

ARC Ames Research Center

ATB Abort Test Booster

ATCS Active Thermal Control System

ATD Anthropomorphic Test Devices

ATLO Assembly Test & 

Launch Operations

ATP Authority To Proceed

ATV Automated Transfer Vehicle

BEO Beyond Earth Orbit 

BTA Boilerplate Test Article 

C&DH Command & Data Handling

C&T Communications & Tracking

CAM Control Account Manager

CCB Configuration Control Board

CDR Critical Design Review

CE Chief Engineer

CM Crew Module

CMA Crew Module Adapter

CMO Chief Medical Officer

CMRT Crew Module Recovery Trainer

CMUS Crew Module Uprighting System

COFR Certification of Flight Readiness

CPIT Cross Program Integration Team

CSM Crew & Service Module

CSO Chief Safety Officer

CT Crawler Transporter

CTIL Communication & Tracking 

Integrated Lab 

D&C Display & Controls

DCR Design Certification Review

DD250 Department of Defense 

form 250

DDT&E Design, Development, 

Test & Evaluation

DFI Developmental Flight 

Instrumentation

DM Data Management

DMJS Docking Mechanism 

Jettison System

DOD Department of Defense

DU Display Unit

ECB Exploration Systems 

Development Control Board

ECD Estimated Completion Date

ECLS Environmental Control and 

Life Support

ECLSS Environmental Control and 

Life Support System

ECN Engineering Change Notice

EDL Exploration Development Lab

EDU Engineering Development Unit

EEE Electrical, Electronic and 

Electromechanical

EERB ESD Engineering Review Board

EFT-1 Exploration Flight Test 1

EGF Flight Support Equipment 

Grapple Fixture

EGS Exploration Ground Systems

EGSE Electrical Ground 

Support Equipment

EIO European Service Module 

Integration Office

EMC Electromagnetic Compatibility

EMI Electromagnetic Interference

ERB Engineering Review Board

ESA European Space Agency

ESD Exploration Systems 

Development

ESD CE Exploration Systems 

Development Chief Engineer

ESD RMO Exploration Systems 

Development Resources 

Management Office

ESM European Service Module

E-STA European Structural Test Article

Acronyms

Resources
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EUS Exploration Upper Stage 

EVA Extra-vehicular Activity 

FAST Final Assembly and Test

FBC Forward Bay Cover

FBCP Forward Bay Cover Parachutes

FCR Flight Control Room

FDR Flight Data Recorder

FIT Focused Integration Team

FMEA/CIL Failure Modes Effects Analysis/

Critical Items List

FOD Flight Operations Directorate

FOP Flight Operations Teams

FPCB ESD Flight Procedures 

Control Board

FRCB ESD Flight Rules Control Board

FRR Flight Readiness Review 

FSW Flight Software 

FTV Flight Test Vehicle 

FY Fiscal Year

GC Ground Controller 

GEMCB Government Equipment & 

Materials Control Board

GFE Government Furnished 

Equipment

GMIP Government Mandatory 

Inspection Point

GMT Greenwich Mean Time 

GNC Guidance, Navigation & Control

GOOV Gas On/Off Valve

GPS Global Positioning System 

GRC Glenn Research Center

GSE Ground Support Equipment 

GTA Ground Test Article 

HEO Human Exploration and 

Operations Mission Directorate

HH&P Human Health & Performance

HITL Human in the Loop

HLS Human Landing System

HMTA Health & Medical 

Technical Authority

HOTH Houston Orion Test Hardware 

HS Heat Shield

HW Hardware

IBR Integrated Baseline Review 

ICPS Interim Cryogenic Upper Stage

ICWG Interface Control 

Working Group 

IG Inspector General

IML Inner Mold Line 

IOZ Industrial Operating Zone 

IPIT Integrated Programmatic and 

Program Control 

Integration Team

IPO Initial Power On

IPT Integrated Product Team

IRF Integrated Robotics Facility 

ISS International Space Station

ITAR International Traffic in 

Arms Regulation

 ITL Integrated Test Laboratory

IWG Integrated Working Group

JICB Joint Integration Control Board

JM Jettison Motor

JPCB Joint Program Control Board

JSC Johnson Space Center

KDR Key Driving Requirement 

KSC Kennedy Space Center

LaRC Langley Research Center

LAS Launch Abort System

LASF Launch Abort System Facility

LCCP Cross Program Launch 

Commit Criteria Panel

LEAF Lunar Environment Arcjet Facility 

LEO Low-Earth Orbit 

LETF Launch Equipment Test Facility

LIDAR Light Detection and Ranging

LIDS Low Impact Docking System 

LM Lockheed Martin 

LOC Loss of Crew

LOI Lunar Orbit Insertion 

LOM Loss of Mission

LOS Loss of Signal 

LOX Liquid Oxygen 

LRD Launch Readiness Date

LRS Landing & Recovery System 

M&P Materials and Processes

MAF Michoud Assembly Facility 

MCC Mission Control Center

MECO Main Engine Cut Off 

MET Mission Elapsed Time 

MEV&V Multi-Element Verification 

& Validation

MGSE Mechanical Ground 

Support Equipment

MIR Mission Integration Review

ML Mobile Launcher

MLI Multi-layer insulation

MMH Monomethylhydrazine 

(hypergolic propellent)

MMOD Micro Meteor Orbital Debris

MMT Mission Management Team 

MOD Mission Operations Directorate 

MODE Multi-Organizational 

Development Engineering

MON Mixed Oxides of Nitrogen

MPCB MPCV Program Control Board

MPCV Multi-Purpose Crew Vehicle

MPPF Multi-Payload 

Processing Facility 

MSERP MPCV Safety Engineering 

Review Panel

MSFC Marshall Space Flight Center

MSO Mass Simulator for Orion

M-STA Mechanical Structural 

Test Article

MVF Mechanical Vibration Facility

MVS Mechanical Vibration System 

NBL Neutral Buoyancy Laboratory 

NPD NASA Policy Directive 

NPR NASA Program Requirement 

O&C Operations and Checkout 

OCHMO Office of the Chief Health and 

Medical Officer

OCOMM Office of Communications 

ODN Onboard Data Network 

OERB Operations Engineering 

Review Board

OFT Orion Flight Test 

OIMU Orion Inertial Measurement Unit 

OMB Office of Management & Budget

OML Outer Mold Line 
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OMS-E Orbital Maneuvering 

System Engine

OMSRP Operations & Maintenance 

Requirements & 

Specifications Panel

OPOC Orion Production and 

Operations Contract

OPSR Orion Program Schedule Review 

ORR Operational Readiness Review

OSMA Office of Safety and 

Mission Assurance

OSMS Orion Summary Master Schedule 

OVIT Orion Vehicle Integration Team

PA-1 Pad Abort-1

PAA Phased Array Antenna 

PBS Plum Brook Station

PCA Pressure Control Assembly

PCB Program Control Board

PCDTV Parachute Compartment Drop 

Test Vehicle 

PCDU Power Conditioning and 

Distribution Unit

PDE Propulsion Drive Electronics

PDR Preliminary Design Review

PDU Power and Data Unit

PLE Project Lead Engineer

PMRB Program Material Review Board

PORT Post-Landing Orion 

Recovery Tests

PPBE Planning, Programming, 

Budgeting, and Excecution

PQM Propulsion Qualification Module

PRA Probabalistic Risk Assessment

PRU Pressure Regulator Unit

PSMS Program Master 

Summary Schedule 

PTC Passive Thermal Control

PTV Parachute Test Vehicle

PV Pressure Vessel

QPM Quarterly Progress 

Meeting (Airbus) 

QPPR Quarterly Program 

Performance Review 

QPSR Quarterly Program 

Status Review 

R&R Release & Retention

R2D2 Rapid Reconfigurable 

Data Distribution

RATF Reverberant Acoustic 

Test Facility 

RCS Reaction Control System

RFP Request for Proposal

ROC Reconfigurable 

Operational Cockpit 

RPL Rapid Prototyping Laboratory

RPOD Rendezvous, Prox ops 

and Docking

RPSF Rotation, Processing

& Surge Facility

S&MA Safety and Mission Assurance

SA Spacecraft Adapter 

SADE Solar Array Drive Electronics

SADM Solar Array Drive Mechanism

SAJ Spacecraft Adapter Jettison 

SAR System Acceptance Review

SAT System Acceptance Test 

SAW Solar Array Wings

SCAN Spacecraft Communications 

& Navigation 

SCAPE Self-Contained Atmospheric 

Protective Ensemble

SE&I Systems Engineering 

& Integration

SEC Space Environments Complex

SEQR Senior Executive 

Quarterly Review

SET Space Environmental 

Test (Facility) 

SET Space Environment Test Facility

SICB SLS Integration 

Control Board

SIM Simulation

SLF Spacecraft Leadership Forum

SLS Space Launch System

SM Service Module

SM&A Safety Mission & Assurance 

SMCB Service Module Control Board

SNIC Standard Network 

Interface Card

SPLASH Structural Passive Landing 

Attenuation for Survivability of 

Human Crew (Project) 

SPT Subsystem Product Teams

SRA Schedule Risk Analysis

SRR System Requirements Review

SSDL Support Software 

Development Lab 

SSM Subsystem Manager

STA Structural Test Article

STORRM Sensor Test for Orion Relative 

Navigation Risk Mitigation 

SVMF Space Vehicle Mock-up Facility 

SW Software 

T&V Test & Verification

TBR To Be Resolved

TCU Thermal Control Unit

TEI Trans-Earth Injection

TI Terminal Initiation 

TLI Trans-Lunar Insertion 

TPR Top Program Risk

TPS Thermal Protection System

TRL Technology Readiness Level

TVAC Thermal Vacuum Chamber

TVC Thrust Vector Control

VAB Vehicle Assembly Building

VAC Verification Analysis Cycle

VICB Vehicle Integration Control Board

VIO Vehicle Integration Office

VMC Vehicle Management Computer

VNS Vision Navigation Sensor

VPU Video Processing Unit

VTB Verification Test Bed 

VVM Visiting Vehicle Manager

WG Working Group

WIT Water Impact Testing

WOOV Water On/Off Valve

WSTF White Sands Test Facility
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For more information about the Orion program, visit 

https://www.nasa.gov/orion

https://www.facebook.com/NASAOrion

https://www.twitter.com/NASA_Orion

https://www.instagram.com/NASAArtemis

https://www.flickr.com/photos/nasaorion/
National Aeronautics and Space Administration

NASA Johnson Space Center

2101 E NASA Pkwy

Houston, TX 77058

www.nasa.gov