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4 Jun 2003

ISS On-Orbit Status 3 June 2003

Part 2 of 2

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)
-- 27.2; ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
SM Transfer Compartment:  Pressure (mmHg) -- 751; temperature (deg C)
--  21.6.
FGB Cabin:  Pressure (mmHg) -- 752; temperature (deg C) -- 23.7.
Node:  Pressure (mmHg) -- 746.4; temperature (deg C) -- 24.2 (shell);
ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
U.S. Lab:  Pressure (mmHg) -- 748.35; temperature (deg C) -- 23.0;
ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
Joint Airlock (Equip. Lock):  Pressure (mmHg) -- 748.45; temperature
(deg C) -- 29.6; shell heater temp (deg C) -- 24.6, ppO2 (mmHg) --
172.3; ppCO2 (mmHg) -- 4.3.
PMA-1:  Shell heater temp (deg C) -- 24.5.
PMA-2:  Shell heater temp (deg C) -- 13.4.

(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); battery #5 is
in "Cycle" mode; 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

Flight Attitude:

XPOP (x-axis perpendicular to orbit plane = "sun-fixed" [yaw: 0.5
deg, pitch: -6.8 deg., roll: 0 deg]), with CMG TA (thruster assist).
Solar Beta angle:  27.2 deg (magnitude decreasing).

Communications & Tracking Systems:

FGB MDM-1 is powered Off; FGB MDM-2 is operational.
All other Russian communications & tracking systems are nominal.
S-band is operating nominally (on string 2).
Ku-band is operating nominally.
Audio subsystem is operating nominally [IAC-1 (internal audio
controller #1) being analyzed after self-test error.  IAC-2 is
prime.]
Video subsystem operating nominally.
HCOR (high-rate communications outage recorder) is operating
nominally. 

Robotics:

SSRMS/Canadarm2 based at MBS PDGF #1 with Keep Alive (KA) power on
both strings.
MBS: KA power on both strings.
MT: latched at WS4, with KA power.
POA: KA power on both strings.
RWS (robotics workstations): Lab RWS is Off; Cupola RWS is Off.

ISS Orbit  (as of this morning, 4 06am EDT [= epoch]):

Mean altitude -- 390.0 km
Apogee -- 394.4 km
Perigee -- 385.6 km
Period -- 92.36 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0006488
Orbits per 24-hr. day -- 15.59
Solar Beta Angle -- 27.2 deg (magnitude decreasing)
Mean altitude loss in last 24 hours -- 85 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 25884
For more on ISS orbit and worldwide naked-eye visibility dates/times,
see http://www.hq.nasa.gov/osf/station/viewing/issvis.html

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