# Presentation: 813583

## Section 8

_***Section 8***_
***Summary of Open Work Orders and Recent Problem Reports***

*** ******. . . Mark Perry***
*EO-1 Spacecraft Systems Engineer, Swales Aerospace, Inc.*

## Work Order Status

***Work Order Status***

***Total number generated from start through 8/4/00 =  1133***
***Number Closed out  =  1119 (98.7% closure rate)***
***Number open  =  14 (as of 8/4/00)***
***Work In Process******	******	******= 1***
***Problem Reports******	****** ******	******= 2 (S-Band Transponder 1)        ******	******	******	******	******      ( Hyperion CAL Lmap 1)          ***
***Redbook Item WOAs******	******= 5 (each discussed in depth)***
***WOAs in closure process******	******= 6***

## 60 PRs During the T/V Test

***60 PRs During the T/V Test***

***8 PRs relating to hardware problems***
***7 PRs for the S-band Transponder (AGC anomaly)***
***1 PR for degradation of the Hyperion primary calibration lamp***
***29 nominal conditions initially perceived as an error***
***Includes noisy A/D converter data, limit violations, high temperatures, TSM tripping, error counters, telemetry delays, event messages, low voltages***
***12 errors, including 8 procedure errors and 4 operator errors***
***3 GSE problems:  ASIST, FEDS, and UPS***
***1 database:  PSE half-voltage FDC calibration***
***7 still under investigation (PR number in parentheses)***
***Cold X-band (1099-20-2)***
***LEISA telemetry drop-out (1099-20-12)***
***3 WARP S/W bus error counters (1099-20-15, 1101-20-9, 1102-20-5)***
***S-band RF temperature telemetry momentarily went to maximum value (1101-20-4)***
***Momentarily low voltage on Hyperion 5-volt supply (1102-20-8)***
***None of the PRs under investigation are considered significant***

## Open Problem Report Status

***Open Problem Report Status***

***Total number generated from start through 8/4/00 =  1696***
***Total number generated since Red Team Review = 124***
***Number Closed out  =  1664 (98.0% closure rate)***
***Number open  =  32 (as of 8/4/00)***
***Work In Closure Process******	******=******	******16******	******(Procedure error and ******	******	******	******	******	******database update)                                                                  ******	******  ******	******1******	******(EGSE) ***
***Test verification required ******	******=******	******9******	******(S-Band Transponder)***
***To be resolved******	******=******	******1******	******(TRW CAL Lamp Problem)***
***Redbook Items ******	******=******	******5***
***WOA 468-20-4 IRU Helium Exposure (see ACS Subsystem)***
*WOA 512-150-1  X-Band Frequency Shift (see RF subsystem)*
*WOA 572-30-10  Bus Chassis Current Exceeding .925mA (see Electrical Subsystem)*
*WOA 770-20-3 One Time Event Chassis Current during EMC Testing (see Electrical Systems)*
*WOA 837-20-1 One Time Event LVPC Current Red Limit (see Power Subsystem)*

## Quality Assurance Spacecraft Bus ElementsSummary of Open PRs as of 8/4/00

***Quality Assurance Spacecraft Bus Elements****Summary of Open PRs as of 8/4/00*

***Hardware ***
***S-Band AGC anomaly (9 separate PRs generated)***
***Degradation of the primary calibration lamp on Hyperion (1 PR generated)***
***Procedure Error / I&T Database Problem***
***16 PRs will be closed once the paper work is completed.***
***1 PR EGSE (In process of closure)***
***Redbook Items***
***5 PRs as discussed earlier***
***Negligible residual risk due to the open PRs***

## Quality Assurance Spacecraft Bus Elements

***Open Problem Reports***

**Pre TV #2**

## Quality Assurance Spacecraft Bus ElementsOpen Problem Reports (continued)

## Quality Assurance Spacecraft Bus ElementsOpen Problem Reports (continued)

***Quality Assurance Spacecraft Bus Elements****Open Problem Reports **(continued)*

## Closure Plan

***Closure Plan***

***All WOAs and PRs to be closed before shipment to the launch site.***
***Exception will be the WOAs and PRs related to the S-Band AGC anomaly and Redbook items.***
***Continue use of the WOA and PR system at the launch site.***
***Any new PRs to be closed before launch, or added to the Redbook with concurrence of GSFC and Swales quality teams.***