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8 July 2003

ISS On-Orbit Status 7 July 2003

Part 2 of 2

After a transient error message on the primary PMCU (power management
controller unit) computer over the weekend, MCC-HG performed a data
dump which is currently being evaluated. The PMCU is operating
nominally. [The message was probably caused by a brief glitch in the
G&NC MDM (guidance, navigation & control computer) while processing
data during TDRS satellite switching.]

Troubleshooting of Ed Lu's EMU on the ground is continuing at MCC-H
at low priority. [During a suit don/doff demo on 5/28, Ed Lu ran into
a problem with his LCVG (liquid cooling ventilation garment), for
which he couldn't establish cooling water flow. The exercise was
terminated, and the issue is still being looked at on the ground with
simulation runs. The spacesuit in question is presently considered
nonfunctional, but it is one of three EMUs on board, and the other
two are functional.] 

MCC-M reports that the R&R of the catalyst cartridge (PKF) in the
SM's micropurification filtration system (BMP) on 7/2 by Malenchenko
was not successful. Because of a problem with the correct
installation of the filter, the system was not activated (contrary to
previous report on 7/2). The subsequent replacement of its heater
unit on 7/3 was also unsuccessful, since it did not fit in place. The
BMP remains operational but is not as efficient as intended. Its
operation in the degraded condition is currently being evaluated.

The degraded power situation in the Russian segment is continuing
unchanged. Of the eight SM batteries, #4 is off line and will
probably be replaced tomorrow with the only remaining spare from the
FGB. Batteries #1, #2 and #3 are operating with reduced capacity.
Appropriate power balancing with USOS and load shedding plans are in
place. Two more 800A accumulators will be manifested on the next
Progress cargo ship (12P). 

U.S. and Russian Segment Status (as of 1:45pm EST).

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

Elektron O2 generator is powered On (16 amp mode). Vozdukh CO2
scrubber is On (in Manual Mode 5/3). 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 (unit is off).
RS air conditioner SKV-1 is On; SKV-2 is Off.

SM Working Compartment: Pressure (mmHg) -- 742; temperature (deg C)
-- 26.6; ppO2 (mmHg) -- data invalid; ppCO2 (mmHg) -- data invalid.
SM Transfer Compartment: Pressure (mmHg) -- 751; temperature (deg C)
--  20.9.
FGB Cabin: Pressure (mmHg) -- 752; temperature (deg C) -- n/a.
Node: Pressure (mmHg) -- 741.34; temperature (deg C) -- 22.8 (shell);
ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
U.S. Lab: Pressure (mmHg) -- 743.81; temperature (deg C) -- n/a; ppO2
(mmHg) -- 169.5; ppCO2 (mmHg) -- 3.6.
Joint Airlock (Equip. Lock): Pressure (mmHg) -- 743.60; temperature
(deg C) -- n/a; shell heater temp (deg C) -- 22.5, ppO2 (mmHg) --
n/a; ppCO2 (mmHg) -- n/a.
PMA-1: Shell heater temp (deg C) -- 19.9
PMA-2: Shell heater temp (deg C) -- 22.5.
(n/a = data not available)
Propulsion System (PS):

Total propellant load available: 3803 kg (8384 lb) as of 6/26
[SM(774) + FGB(2447) + Progress M(182) +Progress M-1(400)].
(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 directed position (Blind/triple-angle mode, non
solar-tracking, drag reduction).
SM batteries: Battery #4 is disconnected (failed 6/16); battery #7 is
in "Cycle" mode; all other batteries (6) are in "Partial Charge"
mode.  Batteries #1, #2 and #3 showing degraded capacity.
FGB batteries: Battery #3 is offline; battery #1 is in "Cycle" mode;
all other batteries (4) are in "Partial Charge" mode.
Plasma Contactor Unit PCU-1 in Standby mode; PCU-2 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-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.
SM Central Computer (TsVM): 3 redundant lanes (of 3) operational.
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:

LVLH -YVV (local vertical/local horizontal = "earth-fixed": z-axis in
local vertical, -y-axis in velocity vector [yaw: -10 deg, pitch: -9.3
deg, roll: 0 deg]), with CMG/TA (thruster assist) Momentum
Management.
Solar Beta angle: 20.0 deg (magnitude increasing).
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 and mated at WS4.
POA: KA power on both strings.
RWS (robotics workstations): Lab RWS is On (DCP connected); Cupola
RWS is Off.
ISS Orbit (as of this morning, 7:22am EDT [= epoch]):

Mean altitude -- 386.9 km
Apogee -- 392.5 km
Perigee -- 381.4 km
Period -- 92.29 min.
Inclination (to Equator) -- 51.63 deg
Eccentricity -- 0.000819
Orbits per 24-hr. day -- 15.60
Solar Beta Angle -- 20.0 deg (magnitude increasing)
Mean altitude loss in last 24 hours -- 80 m
Revolutions since FGB/Zarya launch (Nov. '98) -- 26417
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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