GLAST Large Area Telescope: Performance & Safety Assurance

1. Gamma-ray Large Area Space Telescope GLAST Large Area Telescope: Performance & Safety Assurance Darren S. Marsh Stanford Linear Accelerator Center Performance & Safety Assurance Manager Marsh@SLAC.Stanford.Edu (650) 926-4577

2. Performance Assurance Activities • LAT Mission Assurance Requirements (MAR) Status • LAT MAR dated October 26, 2000 is still currently the baseline MAR • “Phase C/D/E” MAR (revised MAR) in negotiation • Primary changes involve Chapter 4, Design Verification and the addition of flight software deliverables • LAT EEE Parts, Materials and Processes Issues • LAT EEE Parts and Materials and Processes Lists will be submitted to GSFC middle of April • Any additional submissions to these lists must be provided to Jeff Tice (materials) or Nick Virmani (EEE parts) • All fasteners must comply with the procurement documentation and test requirements for flight hardware and critical ground support equipment fasteners contained in 541-PG-8072.1.2, GSFC Fastener Integrity Requirements • EEE parts must have parts stress analyses performed (MAR par. 8.2.2) for conformance with the applicable derating guidelines

3. Performance Assurance Activities (Con’t.) • Procurement quality assurance • Quality Clauses are required in all flight hardware contracts and requisitions • Ensure that appropriate quality requirements are included in all procurements of flight hardware/software and critical GSE • All flight hardware shall have a receiving inspection • Assure all required traceability documentation accompanies hardware • Assure proper storage and control of flight hardware • Enable detection of hardware discrepancies • Only qualified providers are utilized for products and services that will be used for flight hardware • QA shall perform supplier, partner, and subcontractor surveys when necessary

4. Verification Planning • LAT Program Instrument Performance Verification Plan, LAT-MD-00408, Systems Performance Assurance (Section 6), delineates the processes and procedures for verification and test of LAT hardware and software • Required Documentation • Configuration Management • Configuration Item Tracking • Quality Assurance Provisions • Safety • Test Equipment • Test Performance Requirements

5. Verification Test Planning (Con’t.) • Systems Engineering shall assure that all flight hardware/software requirements are identified and adequately flowed down and tested • A test matrix is generated which relates all explicit and derived hardware/software requirements to the specific test phase/method which will validate it • Subsystems managers are responsible for subsystem verification and test procedure matrix • ▪ Test procedures must be developed for each test activity • System Engineering is responsible for instrument test and procedure matrix • ▪ I&T is responsible for developing instrument level test procedures • Quality Assurance/Systems Engineering shall verify the traceability matrix is complete and accurate

6. LAT Test Procedure Matrix

7. Verification Testing Deliverables Title: Performance Verification Procedure CDRL No.: 331 Reference: MAR Section 4.2.2 Use: Describes how each test activity defined in the Verification Plan will be implemented Place/Time/Purpose of Delivery: 15 work days prior to the start of the testing for GSFC approval. LAT Instrument Thermal Vacuum Balance Test Plan- 90 days prior to testing Preparation Information: Describe the configuration of the tested item and the step-by-step functional and environmental test activity conducted at the unit/component, subsystem/instrument, and payload levels. Give details such as instrumentation monitoring, facility control sequences, test article functions, test parameters, quality control checkpoints, pass/fail criteria, data collection and reporting requirements. Address safety and contamination control provisions. A methodology will be provided for controlling, documenting and approving all activities not part of an approved procedure and establish controls for preventing accidents that could cause personal injury or damage to hardware and facilities.

8. Verification Testing Deliverable (Con’t) Title: Verification Reports CDRL No.: 332 Reference: MAR Section 4.2.3 Use: Summarize compliance with system specification requirements and/or provide a summary of testing and analysis results, including conformance, nonconformance, and trend data. Place/Time/Purpose of Delivery: Verification Reports: Preliminary - 5 work days after testing for GSFC information Final - 30 days after verification activity for GSFC information LAT Instrument Thermal Vacuum Balance Test Plan- 90 days prior to testing Instrument Performance Verification Report: Preliminary - At PER for GSFC information Final - 30 days following on-orbit check out for GSFC information Preparation Information: Verification Report: Provide after each unit/component, subsystem/instrument, and payload verification activity. For each analysis activity the report will describe the degree to which the objectives were accomplished, how well the mathematical model was validated by the test data, and other significant results. Instrument Performance Verification Report: Compare hardware/software specifications with the verified values (whether measured or computed). It is recommended that this report be subdivided by subsystem.

9. Identification Unit identification (drawing or part number number with revision level) Unit serial Number Date and time of release for delivery Responsible engineer approval Quality assurance certification (as required) Other approvals as necessary Mechanical Summary Data Mass CG Dimensions Interface Flatness Electrical Summary Data Power consumption (steady state, minimum @ idle, maximum @ peak) Start-up voltage profile Start-up current profile Noise Measurement Steady state Minimum power Maximum power Unit Performance Data (as required and applicable) Unit Support Data Thermistor calibration curves Software version report Hardware installation record Mate/de-mate log On-time log with operational hours Test Execution Information Hi-Pot test Isolation test Insulation resistance test Quality Assurance Data Non-conformance report summary Inspection records Storage, handling, shock records Science Calibration and Trending Data Per the SVAC Plan Other material information as required Hardware Certification – End Item Data Package