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Mir Status Report 22 September 1997 (2)

By Keith Cowing
NASA Watch
September 22, 1997
Filed under

NASA MIR Program
Mir 24 / NASA 5 Status
Date: Monday, September 22, 1997
Mission Day: Mir 24 / NASA 5 MD 48/130
Mir 24 CDR Anatoly Solovyov
Mir 24 FE Pavel Vinogradov
NASA 5 FE Mike Foale
Mir Station System/Subsystem Activities
At 04:23 DMT this morning the motion control computer BTsVM-1 failed when two of three channels in the CPU failed. The gyrodines spun down and Elektron was shut down, but the ventilation system and thermal control loops remained active. The crew used Soyuz to initiate a spin, and within a few orbits the solar array current was 570 amps. The crew replaced Channel A with Channel C from the old computer, but it could not be determined which of the remaining two channels had failed, and there are no spares left onboard. However, the computer passed a self-test at 15:27 DMT, and the ground began reloading the software during the 18:21 DMT comm pass. The attitude reference was rebuilt during the DMT 23:01 comm pass, after which time thrusters-only attitude control was regained. Gyrodine spin-up began during the 00:28 pass.
The crew reported that they observed brown drops floating outside the vehicle around 10:00 DMT this morning, shortly after the Soyuz spinup. These drops seemed to emanate from the vicinity of Kvant-1 and moved in the direction of the other modules at about 20 deg. from the X axis. Mike reported they had a oily, shiny appearance, and that the previous crew had reported a similar sighting. Telemetry did not indicate any leaks.
Vozdukh continued to experience problems after being started on two vacuum valves (vacuum valve 2 was declared failed Saturday night). Further troubleshooting isolated the problem to the fan, which the crew replaced in the afternoon. This replacement did not solve the problem; the crew continued work, including looking for a new fan (there should apparently be two available onboard) until sleep. Work on Vozdukh will continue tomorrow.
No further maintenance was performed on the urine water recovery system SRV-U today.

Mir Payload Activities
Greenhouse Daily Ops (FE-1)
Daily Exercise (Treadmill) with recording on ‘ZY’
PFC for Mike
Data Management
Nothing to report.
Network Status
Nothing to report.
Ground Facilities Status
Nothing to report.
Nothing received today.
Experiment Operations
No activities today due to the systems activities. Mike did report that both Greenhouse and Beetle remain powered.
Experiment Hardware
Nothing to report.
MiSDE Checkout/Docking and MiSDE Docked phase activities radiograms were completed and submitted for translation.
BTS checkout/card switch radiograms were completed and submitted for
MOST clarified to Mike over the weekend that he does not need to do anything with regards to the EVA safety tether. All work related to that item will be done during the EVA or after and Mike will not be involved. Any further questions regarding this item should be directed to the EVA group in Houston.
SMP/Medical Mike participated in the second day of the physical training cycle with recording on the ‘ZY’.
An audio only Private Family Conference (PFC) took place beginning at 19:58 DMT.
Environmental Parameters (Previous 24 hour period):
Parameter Min. Max. Nominal Range
Pressure (mmHg) Base Block 617 620 660-850
ppO2 (mmHg) 149 152 140-200
ppCO2 (mmHg) 4.8 7.3 up to 8.0
ppH20 (mmHg) 14.2 15.2 8-14
Humidity (percentage) 56 58 30-75
Temperature (xC) base block (BB) 25.2 26.6 18-28
Communications Summary
A/G with Consultants Group
19:58-20:08 PFC
23:10-23:12 Packing; BTS; MIM
00:42-00:46 Packing; Priroda drying ok
Packet —
The form 24 and one work file was submitted for uplink. Two files were
received from Mike; one personal and one work (prepacking info).
MIR 24/NASA 5 MD 49/131
MIM Checkout
MD 48/130

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