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4 Apr 2003

ISS On-Orbit Status 3 Apr 2003

Part 2 of 2

U.S. and Russian Segment Status (as of 12:45pm EST).

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

Elektron O2 generator is powered On.  Vozdukh CO2 scrubber is On
(manual mode 5).  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) -- 740; temperature (deg C)
-- 29.0; ppO2 (mmHg) -- 183.1 (suspect); ppCO2 (mmHg) -- 2.4 (data
suspect). SM Transfer Compartment:  Pressure (mmHg) -- 751;
temperature (deg C) -- 20.0.  FGB Cabin:  Pressure (mmHg) -- 752;
temperature (deg C) -- 23.3. Node:  Pressure (mmHg) -- 738.16;
temperature (deg C) -- 23.4 (shell); ppO2 (mmHg) -- 165.6; ppCO2
(mmHg) -- 4.3. U.S. Lab:  Pressure (mmHg) -- 740.07; temperature (deg
C) -- 22.5; ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a;

Joint Airlock (Equip. Lock):  Pressure (mmHg) -- 740.17; temperature
(deg C) -- 21.1; shell heater temp (deg C) -- 21.5, ppO2 (mmHg) --
n/a; ppCO2 (mmHg) -- n/a.
PMA-1:  Shell heater temp (deg C) -- 25.8
PMA-2:  Shell heater temp (deg C) -- 16.6

(n/a = data not available)

Propulsion System (PS):

Total propellant load available [SM(774) + FGB(2746) + Progress(474]
--- 3994 kg (8805 lb) as of 4/3/03.  (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 Autotrack (sun-following).
SM batteries:  All batteries (8) are in "Partial Charge" mode.
FGB batteries:  Battery #2 is in "Cycle" mode; all other batteries
(5) are in "Partial Charge" mode.
Plasma Contactor Unit PCU-1 and PCU-2 both in Standby 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-2 MDM is prime; GNC-1 is Backup.
INT-1 is operating; INT-2 is Off.
EXT-1 is On (primary), EXT-2 is Off.
LA-1, LA-2 and LA-3 MDMs are all operating.
PL-2 MDM is On (primary); PL-1 MDM is Off
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-2

Flight Attitude:

XPOP (x-axis perpendicular to orbit plane = "sun-fixed" [yaw: -179.0
deg, pitch: -8.8 deg., roll: 0 deg]), with CMG TA (thruster assist)
Momentum Management.
Solar Beta Angle:  21.0 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.
Ku-band is operating nominally.
Audio subsystem operating nominally.
Video subsystem operating nominally (VTR1 is operable again).
HCOR (high-rate communications outage recorder) is operating
nominally.

Robotics:

SSRMS/Canadarm2 based at Lab PDGF 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, 3:59am EST [= epoch]):

Mean altitude -- 388.6 km
Apogee -- 394.2 km
Perigee -- 383.1 km
Period -- 92.33 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0008156
Orbits per 24-hr. day -- 15.60
Solar Beta Angle:  21.0 deg (magnitude decreasing)
Mean altitude loss in last 24 hours -- 200 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 24933
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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