ISS MER Management’s Daily Notes Thursday, June 21, 2001 (GMT 172) – 12:00 pm
The following notes highlight the ISS activities within the last 24 hours that were discussed during the morning NASA and Boeing management teleconferences, as well as the daily MER Management & Subsystem Tag-Up. These notes are not intended to provide the current configuration of the ISS systems, nor are they intended to capture all of the events that have occurred in the past 24-hour period or that are planned for the next 24-48-hour period. For a detailed overview of the last 24-hour period and upcoming ISS events, refer to the “0800 Report” and “Daily Report”, published by MOD on its Mission Control Center (MCC) website at http://mod.jsc.nasa.gov/mcc (select “Realtime Mission,” then “ISS Msgs”).
SM C&W Events: Several C&W events were annunciated, including an SkV-1 air conditioner off-nominal shutdown, EPS SUDN (sun sensors) unit powered off, C&T SM BVS powered off, and EPS SM additional load activation limited, ECLSS SM Pressure Cabin Pressure high, and BP-1 fire hazard. The events were associated with an ORU changeout in the SM and returned to normal afterwards.
MCOR: MCOR did not respond to a playback command. The MCOR was recycled with no joy. MCOR heartbeat is incrementing abnormally; all temperatures remain nominal. MCOR ART will meet today.
C&C File Transfer to Support SSRMS Operations: In preparation for the SSRMS operations planned for today, an attempt was made to transfer the SSRMS operational files from the Backup C&C-1 Mass Storage Device (MSD) to the Primary C&C-3 MSD to replace the SSRMS diagnostic files that had been in use for the SSRMS. Therefore, the operational files were uplinked to C&C-3 from the ground, which was successful. Several data dumps were subsequently taken and 2 additional reallocated blocks on the C&C-3 MSD were found. The C&DH team believes the transfer anomaly was a transient event, but investigation into the root cause is continuing.
Event Code Clearance: Yesterday, ODIN uplinked Command from Scratch (CFS) commands to clear three C&W events that were logged on GMT-149. The events cleared, but it was then noticed that the C&W counter was still indicating 1 when it should also have cleared. C&DH is working on new CFS to clear the C&W counter.
RPCM N13B-A Anomaly Resolution: The ART investigating whether RPCM N13B-A RPC-1 is actually open or closed met yesterday. RPC-1 powers emergency lighting that was recently installed in Node 1. After the lighting was installed, the RPC was commanded closed to charge the light’s batteries, but external output voltage telemetry indicated that the RPC did not close. RPCM data dumps indicated that the internal RPC output discrete status was closed. The ART recommends opening the other power supply to the emergency lighting battery. If the emergency lights come on, it would indicate that the suspect RPC was open. If the lights do not come on, it would indicate the RPC was closed. The procedure for executing this recommendation is in work.
BP/ECG Anomaly Resolution: The BP/ECG ART met yesterday and finalized the procedure to be used for on-orbit troubleshooting of the BP/ECG. Last week, the BP/ECG tripped UOP#2 when it was plugged in. Based on a review of the electrical design of the BP/ECG, the team believes that low voltage AC noise may be leaking back through one of the BP/ECG shield/ground wires, causing enough “leakage” for the UOP to trip. Since the BP/ECG has worked successfully in the SM (i.e., it’s a dual-voltage system), the procedure calls for the BP/ECG to first be plugged into a CHeCS rack that is not equipped with GFCI protection to verify that it works. The ART is working with the Operations Planners to schedule the BP/ECG troubleshooting for next week.
IWIS / TVIS Measurements: A special meeting between the Struct/Mech, IMT, MOD, EV&CS, and MER Management teams was conducted yesterday to finalize procedures for performing IWIS measurements and TVIS inspections during TVIS operations prior to Flight 7A. IWIS is used to measure the vehicle’s dynamic response to induced loads. Since IWIS did not successfully collect data during the 4P docking event, an ART has been investigating potential causes for the IWIS anomaly, and determined the most likely cause to be deficient batteries in the IWIS Remote Sensing Units (RSUs). Since a DTO is scheduled during Flight 7A to use IWIS to measure the station’s dynamic response to different Orbiter thruster firing events, the ART recommended that an additional IWIS data collection event be performed prior to 7A to ensure that IWIS is functional for the DTO. The participants agreed upon a set of parameters to be included within the test, including additional inspection of TVIS since it’s being operated in passive mode, with the intent of getting the testing into the timeline for early next week.
SSRMS Airlock Install Dry-Runs: The crew successfully performed an SSRMS dry-run for airlock installation this morning on the prime SSRMS string. In addition, an AVU calibration and a digital characterization series are planned.
Refresh of DDCUs LA1B and P62B: Due to the troubleshooting events associated with the SSRMS software uplink, activities involving the DDCU LA1B and DDCU P6-2B bit flips were postponed until today. The first priority this morning will be to transition DDCU LA1B so that it operates from SRAM mode to avoid potential conflicts that could occur as a result of the intermittent data bit flip in Block 10 of the DDCU’s EEPROM. Block 10 contains critical code for the DDCU. The CCS software patch needed to allow refresh commands for DDCU LA1B was approved by the ASCB yesterday, so development of the patch should commence today. When the patch is available and tested, the DDCU will be refreshed. DDCU P6-2B, which was to be refreshed yesterday, is tentatively scheduled to be refreshed today. The bit flip in DDCU P6-2B is in a non-critical block of code.
New IFIs Generated Within the Last 24-Hours
444 – SM Matching Unit YC-21 Failed
Today’s Events (GMT 2001/172):
SSRMS Airlock Dry Run (prime and redundant strings)
PCU Testing (continuing throughout the week)
Re-attempt to refresh DDCU-P62B
Switch DDCU LA1B to operate from SRAM
Upcoming Events for GMT 2001/173-175 (i.e., Friday, Saturday, Sunday):
Friday: FD/Crew Tag-Up, CKB-2 Install; U.S. PAO Event; MAS Analysis T+2, Food Supply Inv.; ARIS ICE Ops; (IWIS / TVIS Test delayed tentatively delayed until next week)
Saturday: Off-duty, PPC for CDR, PFC-FE-2, weekly cleaning
Sunday: Off-duty, PFCs, PPCs for FE-1 & FE-2
Other Upcoming Events:
Smoke Detector ART – Thursday, June 21, 9am – MER Conference Room
Video Tape Recorder (VTR) ART – Thursday, June 21, 11am, MER Conference Room
RPC ART – Thursday, June 21, 3pm, MER Conference Room
WTF Core Processes Meeting – Thursday, June 21, 4pm, MER 222-6
BGA ART – Friday, June 22, 12:30pm, MER Conference Room
