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3 Apr 2003

ISS On-Orbit Status 2 Apr 2003

Part 3 of 3

Propulsion System (PS):

Total propellant load available [SM(774) + FGB(2746) + Progress(474]
---  3994 kg (8805 lb) as of 3/27/03.  (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:  25.4 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, 3:21am EST [= epoch]):

Mean altitude -- 388.8 km
Apogee -- 394.4 km
Perigee -- 383.3 km
Period -- 92.33 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0008265
Orbits per 24-hr. day -- 15.59
Solar Beta Angle:  25.4 deg (magnitude decreasing)
Mean altitude loss in last 24 hours -- 200 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 24917
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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