# Presentation: 407864

## Section 31

_***Section 31***_
***Flight Assurance***

*** ******. . . Michael P. Kelly***
*EO-1 Systems Assurance Manager *

## Contents

***Contents***

***Parts Status***
***Software Assessment***
***Reliability Assessment***
***Safety Status ***
***Spacecraft Independent Inspection***
***Critical Problem Records/Issues***
***Transponder Rework and Retest Plan***
***Remaining Work***
***Summary***

## Parts

***Parts***

***All Hyperion and ALI radiation issues have been worked by GSFC radiation and parts personnel.  There is minimal risk to the mission. ***
***All part waivers have been approved by the SAM and the Mission Manager.***
***GIDEP Alerts are constantly being evaluated against the EO-1 part list.***
***No recent matches identified***

## Software Assessment

***Software Assessment***

***Per Code 300 Director’s request, a software assessment was conducted of both the flight and ground code for this mission.***
***Code 300 representatives were very satisfied with the software code.  This is good news for the project. ***
***An agreement was reached between the Project and Code 300 to perform Independent Verification and Validation in West Virginia for this mission. ***

## Reliability Assessment

***Reliability Assessment***

***Spacecraft Probabilistic Risk Assessment (PRA) has been completed***
***All risk assessments were presented at the last Red Team Review***
***Complementary use of Failure Mode Effects Analysis (FMEA), Fault Tree Analysis (FTA), and PRA***
***Reliability of the EO-1 minimal mission is 0.7447 @1 year***
***By going to the Accelerated mission, the probability of completing the Minimal Mission increases to 0.90***

## Safety Status

***Safety Status***

***Final Revision to Hazardous and Non-Hazardous TOPs are in process by Swales***
***Final Update of the MSPSP is in process by Swales***
***Currently, no safety issues at GSFC or Launch Site***

## Spacecraft Independent Inspection

***Spacecraft Independent Inspection***

***Supplier Assurance Contract Representative (Warren Nichols - ex-Langley) performed an independent hardware inspection of the spacecraft prior to second Thermal Vacuum test***
***Only two issues were identified during the inspection.***
***Thinning paint on ALI instrument (Accepted by MIT and has no impact on performance)***
***Staking of screws on the AC instrument (Not required)***
***Both issues were evaluated and dispositioned as “use-as-is” ***

## Critical Problems Records/Issues

***Critical Problems Records/Issues***

***The following is a list of current issues on SAM watch list:***
***Helium Issue for IRU***
***SAM Opinion: Need to track this at the launch site.  IRU appear to be holding steady. (just a bit of margin though) I am concerned about this one.***
***Image Star Tracker Issue (potential impact on EO-1 Mission)***
***SAM Opinion: Image Star Tracker appeared to be improving.  Probably a non-issue for EO-1.***
***X-Band Frequency Shift***
***SAM Opinion: 99% a GSE cabling issue.  This will be discussed in the Mission Redbook.***
***T/V Chamber at -20 degrees C ***
***SAM Opinion: X-Band Antenna appears to be okay.***

## Critical Problems Records/Issues

***Critical Problems Records/Issues***

***Hyperion Primary Calibration Lamps***
***SAM Opinion: Unknown cause of degradation with primary lamps.  Secondary appear to be fine.  I am concerned about this issue.  This will be included in the Mission Redbook.***
***Transponder AGC Drop outs***
***SAM Opinion: See next chart for more details***

## Transponder Rework Plan 

***Transponder Rework Plan ***

***AGC Anomaly has been 100% verified in the transponder testing at Loral Conic.***
***SAM is satisfied with spacecraft shipping to launch site without transponder***
***Visual Inspection of the transponder has uncovered two problems:***
***3 broken coaxial cables, and 1 other damaged due to inadequate stress relief ***
*Disposition: Repair all 4 cables and inspect the rest of the coaxial cables throughout the transponder*
***Hole in diode on the VCXO Module***
*Disposition: Perform failure analysis of this diode and replace with new diode*
***Replace only Category IV ATC Capacitors (2 in total) ***
***All other ATC Capacitors were cleared by testing of spares from the same lot***

## Transponder Retesting Plan 

***Transponder Retesting Plan ***

***SAM Proposed Retesting Plan:***
***Pre-Acceptance Test Thermal Cycling***
***Full Acceptance Testing***
***8 thermal vacuum cycles in total (conduct 4 cycles of thermal vacuum, then vibration, then last 4 thermal vacuum cycles)***
***powered vibration, 3 axes at launch loads***
***EMI testing (to be evaluated)***

## Remaining Work

***Remaining Work***

***Minor Waivers must be documented and formally submitted to the project from the LVPC Circuit Analysis performed by STI***
***NCRs for the WARP - SAM has the action***
***Updated Spacecraft Verification Specification (SAI-SPEC-158) - Swales is working***
***Safety Waivers Need Mission Manager Signature***

## Summary

***Summary***

***All waivers have been approved by the SAM and the Mission Manager ***
***All spacecraft testing has been completed and is properly documented***
***SAM agrees the spacecraft is ready for shipment to the launch site***