This Echo is READ ONLY !   NO Un-Authorized Messages Please!
 ~~~~~~~~~~~~~~~~~~~~~~~~   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

23 May 2003

ISS On-Orbit Status 22 May 2003

Part 2 of 2

Discussions are continuing between NASA and RSC-Energia of the ISS
altitude strategy to be adopted for the period prior to the Shuttle's
return to flight.  Pending final management approval, the old plan of
conducting the next reboost in mid-June, mainly to support optimum
ULF-1 and 12A mission-compatible docking altitudes of 380 and 370 km,
resp., has been changed, and the mid-June maneuver is no longer
required.   [Since neither Progress 11P nor 12P will require orbit
phasing burns, the next ISS reboosts would be conducted in early
September and October, to provide correct phasing for Soyuz 7S launch
and 6S return to Northern Kazakhstan.  These burns would result in
360 km altitude for the ISS by April 2004, more than adequate for
ULF-1 (management agreement on this lower altitude is still required
by both sides).  It is currently estimated that these new phasing
burns will require a total of 4 m/sec delta-V, as opposed to the
original June/October reboosts of 7.5 m/sec, which would have
resulted in 380 km by January 2004 for ULF-1.  Should the Shuttle
return-to-flight occur earlier than assumed here (probably not known
before late-July/August earliest), the ISS may have to be deboosted
to a lower orbit, depending on Shuttle performance.]

Today's CEO (crew earth observations) targets, now no longer
restricted by the Lab science window ruled off-limit due to flight
attitude, were Sao Paulo, Brazil (a touch right; Rio was off left of
track), Chao Lava, Chile (this major lava flow, famous in geological
literature, appears as a black wrinkled mass in the desert of the
high Andes), Congo-Zimbabwe Biomass Burning (burning has already
begun in the savanna forest immediately south of the Congo
rainforest, although the dry season has only just started. Heavy
rains in recent years have caused an unusual buildup of biomass in
these savannas.  Looking left and right of track. [Dark green
Okavango delta swampland in the otherwise waterless Kalahari Desert,
was right of track.]), Brasilia, Brazil (a touch left), Detroit,
Michigan (night target; nadir pass), Osaka, Japan (night target;
nadir pass.  Other city lights [Tokyo] will have appeared, especially
right of track), Bombay, India (looking a touch right for this major
port city), Istanbul, Turkey (night target; nadir pass), Casablanca,
Morocco (night target; nadir pass), and Xianggang (Hong Kong), China
(the ISS pass was sufficiently north of Hong Kong for the crew to see
the whole urbanizing region of Hong Kong-Shenzhen, one of the
fastest growing metro areas in China). CEO images can be viewed at
the websites http://eol.jsc.nasa.gov and
http://earthobservatory.nasa.gov

U.S. and Russian Segment Status (as of 1:40pm 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 (manual mode 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.  RS air
conditioner SKV-1 is On; SKV-2 is Off. SM Working Compartment:
Pressure (mmHg) -- 742; temperature (deg C) -- 27.4; ppO2 (mmHg) --
data invalid; ppCO2 (mmHg) -- data invalid. SM Transfer Compartment:
Pressure (mmHg) -- 751; temperature (deg C) -- 22.3.
FGB Cabin:  Pressure (mmHg) -- 748; temperature (deg C) -- 21.0.
Node:  Pressure (mmHg) -- 744.52; temperature (deg C) -- 23.4
(shell); ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
U.S. Lab:  Pressure (mmHg) -- 746.33; temperature (deg C) -- 22.5;
ppO2 (mmHg) -- 172.7; ppCO2 (mmHg) -- 4.8.
Joint Airlock (Equip. Lock):  Pressure (mmHg) -- 746.43; temperature
(deg C) -- 28.2; shell heater temp (deg C) -- 24.8, ppO2 (mmHg) --
n/a; ppCO2 (mmHg) -- n/a.
PMA-1:  Shell heater temp (deg C) -- 21.8.
PMA-2:  Shell heater temp (deg C) -- 13.5.
(n/a = data not available)

Propulsion System (PS):

Total propellant load available: 3573 kg (7877 lb) as of 5/22
[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 "directed" (non-solar tracking) mode ("sun slicer"
position, for drag reduction).
SM batteries:  Battery #8 is failed; batteries #1 and #4 are in ROM
(capacity restoration mode); all other batteries (5) 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 On (primary); PL-1 MDM is On
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-2 (GPS)
Angular rate source -- RGA-2

Flight Attitude:

LVLH -YVV (local vertical/local horizontal = "earth-fixed": z-axis in
local vertical, -y-axis in velocity vector [yaw: -90 deg, pitch: -6.8
deg, roll: -3.4 deg]), with CMG/TA (thruster assist) Momentum
Management.
Solar Beta angle:  72.0 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 at WS4, with KA power.
POA: KA power on both strings.
RWS (robotics workstations): Lab RWS is Off; Cupola RWS is Off.

 - END OF FILE -
==========

@Message posted automagically by IMTHINGS POST 1.30
---