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6 June 2003

ISS On-Orbit Status 5 Jun 2003

Part 2 of 3

Extensive work has been done by Houston and Moscow specialists on the
ISS flight attitude for the Progress docking.  [Because of the
necessary feathering of the P6 solar arrays (to protect them from
thruster plume contamination as well as prevent their interference
with Kurs radio signals), onboard energy balance will require
switching to U.S. P6 storage batteries and powering down some
systems.  For a nominal automated Kurs docking, these deactivations
will involve Lab, Node and PMA-1 shell heaters and the TCCS (trace
contaminant control subsystem) from channel 2B; and Lab and Airlock
shell heaters plus one of the two power strings of the SSRMS' MBS
(mobile base system) from channel 4B.  For a second docking attempt
one orbit later, the EXPRESS Rack 1 (ER1) would also be turned off.
Lowest state of charge (SOC) of the batteries would in this case
occur on the 4B side, with 67% (still above the flight rule limit of
65%).  In the RS, on 6/7 (Saturday) TsUP will attempt to bring the
failed SM battery #4 back on line, but even if successful, it
probably will provide only minimal support. All SM batteries will
carry a full charge two orbits before docking, and both the Elektron
oxygen generator and the SKV-1 air conditioner will be deactivated
during the docking, to reduce loads by about 1000 watts.] 

Today's CEO (crew earth observation) targets, limited in the current
XPOP attitude by flight rule constraints on the use of the Lab
nadir/science window, also excluding any night target viewing, were
Angolan Biomass Burning (prime pass over the burning zone south of
the rainforest), Congo-Zimbabwe Biomass Burning (prime pass over the
burning zone south of the rainforest), Brasilia, Brazil (nadir pass),
High Central Andean Glaciers (shooting any ice-capped volcanoes that
appear near nadir), Western Mediterranean Haze (the ISS track
followed the coast of Spain and southern France: looking right for
any haze masses held in the Med basin.  Shooting margins of haze
bodies if possible, since these indicate subtle smaller circulations
in the atmosphere.  [A Turkish researcher has just requested handheld
views to illustrate a major new analysis of Saharan dust transport in
the Med basin; such "visualization" images are often chosen ahead of
other kinds of illustrative materials, even in page-limited
publications]), and Cloud field dynamics, Baja (Dynamic event.
Looking for vortices generated in the stratus cloud field as the
cloud field moves past the Guadalupe Islands, off Baja). CEO images
can be viewed at the websites http://eol.jsc.nasa.gov
http://earthobservatory.nasa.gov

U.S. and Russian Segment Status (as of 1:15pm EST).

Environmental Control and Life Support (ECLSS) and Thermal Control
(TCS):

Elektron O2 generator is powered On (20 amp mode).  Vozdukh CO2
scrubber is On (manual mode-5/day, mode-3/night).  U.S. CDRA CO2
scrubber is Off.  TCCS (trace contaminant control subsystem) is
operating.  MCA (major constituents analyzer) is operating.  BMP
Harmful Impurities unit: absorbent bed #1 in Purify mode, bed #2 in
Purify mode.  RS air conditioner SKV-1 is On; SKV-2 is Off.
SM Working Compartment:  Pressure (mmHg) -- 742; temperature (deg C)
-- 27.7; ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
SM Transfer Compartment:  Pressure (mmHg) -- 751; temperature (deg C)
-- 21.4.
FGB Cabin:  Pressure (mmHg) -- 752; temperature (deg C) -- 23.3.
Node:  Pressure (mmHg) -- 745.16; temperature (deg C) -- 23.6
(shell); ppO2 (mmHg) -- 171.5; ppCO2 (mmHg) -- 4.1.
U.S. Lab:  Pressure (mmHg) -- 747.04; temperature (deg C) -- 23.1;
ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
Joint Airlock (Equip. Lock):  Pressure (mmHg) -- 747.14; temperature
(deg C) -- 29.0; shell heater temp (deg C) -- 24.4, ppO2 (mmHg) --
n/a; ppCO2 (mmHg) --n/a.
PMA-1:  Shell heater temp (deg C) -- 25.0.
PMA-2:  Shell heater temp (deg C) -- 17.2.

(n/a = data not available)

Propulsion System (PS):

Total propellant load available: 3573 kg (7877 lb) as of 5/29
[SM(774) + FGB(2547) + Progress(252)].  (Capability: SM -- 860 kg;
FGB -- 6120 kg). 

Electrical Power Systems (EPS):

Both P6 channels fully operational.  BGA (beta gimbal assembly) 2B
and 4B both in autonomous Autotrack (45 deg biased for drag
reduction). SM batteries:  Batteries #4 is disconnected (failed); all
other batteries (6) are in "Partial Charge" mode (battery #2 is
exhibiting degraded performance).
FGB batteries:  Battery #4 is disconnected; all other batteries (5)
are in "Partial Charge" mode.
Plasma Contactor Unit PCU-1 in Standby mode; PCU-2 in Discharge mode.

Command & Data Handling Systems:

C&C-1 MDM is prime, C&C-2 is back-up, and C&C-3 is in standby.
GNC-1 MDM is prime; GNC-2 is Backup.
INT-1 is operating; INT-2 is Off.
EXT-2 is On (primary), EXT-1 is Off (both now upgraded to R3).
LA-1, LA-2 and LA-3 MDMs are all operating.
PL-2 MDM is Off; PL-1 MDM is Operational.
APS-1 (automated payload switch #1) and APS-2 are both On.
SM Terminal Computer (TVM): 3 redundant lanes (of 3) operational.
Being upgraded.
SM Central Computer (TsVM): 3 redundant lanes (of 3) operational.
Being upgraded.

Attitude Control Systems:

3 CMGs on-line (CMG-1 failed).
State vector source -- U.S. SIGI-1 (GPS)
Attitude source -- U.S. SIGI-1 (GPS)
Angular rate source -- RGA-1

 - Continued -

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