GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
LAT Engineering Meeting, April 1, 2003
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
GLAST LAT Project
LAT Engineering Meeting, April 1, 2003
Performance Assurance Activities
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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
GLAST LAT Project
LAT Engineering Meeting, April 1, 2003
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
GLAST LAT Project
LAT Engineering Meeting, April 1, 2003
Verification Planning
• LAT Program Instrument Performance Verification Plan, LATMD-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
GLAST LAT Project
LAT Engineering Meeting, April 1, 2003
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
GLAST LAT Project
LAT Engineering Meeting, April 1, 2003
LAT Test Procedure Matrix
Procedure
Subsystem
Electronics
ACD
4.17
4.16
Mechanical
4.18
Tracker
4.14
Calorimeter
4.15
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Electrical
I/F
Comprehensive Performance
Acceptance Test
Limited Performance
Aliveness
Environmental
Random Vibration
Sine Vibration
Thermal Vacuum
EMI/EMC
Mechanical
Static Load
Mass
CG
Random Vibration
Sine Vibration
Thermal Vacuum
EMI/EMC
LAT
I&T
4.19
GLAST LAT Project
LAT Engineering Meeting, April 1, 2003
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.
GLAST LAT Project
LAT Engineering Meeting, April 1, 2003
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 onorbit 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.
GLAST LAT Project
LAT Engineering Meeting, April 1, 2003
Hardware Certification – End Item Data Package
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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
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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