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23 April 2003

ISS On-Orbit Status 22 Apr 2003

Part 2 of 2

U.S. and Russian Segment Status (as of 1:27pm EST).

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

Elektron O2 generator is powered On (32 Amp mode).  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) -- 742; temperature (deg C)
-- 27.2; ppO2 (mmHg) -- data invalid; ppCO2 (mmHg) -- data invalid.
SM Transfer Compartment:  Pressure (mmHg) -- 751; temperature (deg C)
-- 21.1.
FGB Cabin:  Pressure (mmHg) -- 752; temperature (deg C) -- 22.0.
Node:  Pressure (mmHg) -- 741.34; temperature (deg C) -- 23.7
(shell); ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
U.S. Lab:  Pressure (mmHg) -- 743.50; temperature (deg C) -- 23.8;
ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
Joint Airlock (Equip. Lock):  Pressure (mmHg) -- 744.01; temperature
(deg C) -- 23.7; shell heater temp (deg C) -- 24.1, ppO2 (mmHg) --
164.5; ppCO2 (mmHg) -- 4.1.
PMA-1:  Shell heater temp (deg C) -- 24.6
PMA-2:  Shell heater temp (deg C) -- 12.9

(n/a = data not available)

Propulsion System (PS):

Total propellant load available: 3668 kg (8086 lb) as of 4/17/03
[SM(774) + FGB(2642) + 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 Autotrack (sun-following).
SM batteries:  Battery #4 is disconnected, in stand-alone ops; all
other batteries (7 are in "Partial Charge" mode.
FGB batteries:  Battery #5 is disconnected; all other batteries (5)
are in "Partial Charge" mode.
Plasma Contactor Unit PCU-1 and PCU-2 both in Standby mode (after the
EVA) 

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 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: 0.5
deg, pitch: -8.8 deg., roll: 0 deg]), with CMG TA (thruster assist)
Momentum Management.
Solar Beta Angle: -39.5 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; VTR2 in
troubleshooting).
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, 3:54am EDT [= epoch]):

Mean altitude  392.3 km
Apogee -- 396.7 km
Perigee -- 387.9 km
Period -- 92.40 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0006526
Orbits per 24-hr. day -- 15.58
Solar Beta Angle:  -39.5 deg (magnitude decreasing)
Mean altitude loss in last 24 hours -- 100 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 25229
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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