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From: starrfie@hydro.la.asu.edu (Sumner Starrfield)
Subject: Project Science HST Status Report #4: 6 Dec 1993 (fwd)
Date: Mon, 6 Dec 93 22:53:33 MST
Forwarded message:
>From HRSSHORE%STARS.decnet@hrs.gsfc.nasa.gov Mon Dec 6 22:38:24 1993
Date: 7 Dec 93 00:30:00 EST
From: "STARS::HRSSHORE" <HRSSHORE%STARS.decnet@hrs.gsfc.nasa.gov>
Subject: Project Science HST Status Report #4: 6 Dec 1993
To: "sshore" <sshore@vines.iusb.indiana.edu>
Cc: "starrfie" <starrfie@hydro.la.asu.edu>
From: HRS::HRSAKE 6-DEC-1993 22:17:32.36
To: HRSSHORE ! SENT TO @FSM_GHRS
CC:
Subj: Project Science Status Report 4
From: UIT::HRSCARPENTER "Let's see what's out there!" 6-DEC-1993 20:25:19.73
To: HRS::HRSAKE ! SENT TO @FSM_STATUS.DIS
CC:
Subj: Project Science Status Report #4 - HST FSM
fsm_1206.status
to: SSWG, STUC, ECF, etc.
STATUS REPORT: HST First Servicing Mission
As of Mission Elapsed Time: Day 4, 11:00
(15:30 EST 12/05/93)
K. Carpenter and M. Niedner
HST Project Science Office
NASA - GSFC
Accomplishments/Major Events:
pre-EVA: launch, rendevous and grapple of HST
EVA #1 - restoration of full gyro redundancy by replacement of RSU's 2 & 3
and ECU's 3 and 1. We now have 6 fully functional gyros.
Replacement of 8 fuse plugs.
Solar array preparations for EVA 2.
EVA #2 - jettisoning of +V2 wing of Solar Array - I
installation of both wings of Solar Array - II
SI Status:
GHRS is in 3-DEB warm-up mode (4th DEB turned off to avoid getting
too warm)
WFPC-I has its TEC's turned back on (they were turned off over night
to avoid overheating)
FOC remains in Hold Mode
HSP remains in Safe mode
FOS has low voltage on, to enable pressure sensor
Upcoming Events:
EVA 3: Removal of WF/PC I
Installation of WFPC 2
Replacement of MSS 1 and 2 (magnetometers)
Problems/Concerns:
The GHRS pressure sensor has detected an increase in pressure
inside the aft shroud at three separate times during the mission:
1) during rendevous, 2) during EVA 1 when Storey Musgrave was
inside the RSU bay, and 3) during EVA 2 when the orbiter performed
a burn to separate from the discarded SA I wing. The pressure
was approximately a factor of 10x higher in the latter two instances,
but analysis indicates that there should be no contamination of the
science instruments even in those cases. The FOS pressure sensor has
been turned on to provide an additional source of information during
forthcoming EVA's and maneuvers.
Attached is a copy of the CSR Daily Report from JSC:
-------------------------------------------
STS-61
CSR DAILY REPORT
(6 A.M. CST 12/5/93 TO 6 A.M. CST 12/6/93)
HUBBLE SPACE TELESCOPE (HST)
Retraction and stowage of one HST solar array proceeded nominally. The
positive axis solar array outboard bistem was bowed approximately one third of
the way from the solar array drum. Retraction of the disabled solar array was
stopped by the crew when the bowed and twisted bistem approached the solar
array drum. The decision was made to jettison the disabled solar array during
the second extravehicular activity (EVA).
During flight day 4 crew sleep, four of six gyros successfully completed
functional testing. Testing of the remaining gyros will occur during crew
sleep, early on flight day 5.
The second EVA to service HST included replacement of both original solar
arrays. The crew manually released and jettisoned the disabled solar array.
The orbiter maneuver to separate from the jettisoned solar array did not affect
HST. The second solar array was stowed for post-flight analysis. Both new
solar arrays successfully passed an aliveness test. Functional testing of the
new solar arrays will occur after solar array deployment, before the HST is
released from the Flight Support System.
Earlier in the day, HST solar array electrical current monitors indicated an
occasional increase of
1.5 amps in the electrical current from one solar array. The GSFC Space
Telescope Operations Control Center (STOCC) reproduced the signature of the
anomaly, tracing the increase to an electrical short between two wires
previously suspected to have been impacted by a micrometeoroid.
Replacement of both solar arrays should resolve the situation.
IMAX CABIN CAMERA AND IMAX CARGO BAY CAMERA (ICBC)
Electrical current traces have indicated three possible in-cabin camera shots
taken during the second EVA. However, no shots have been confirmed by the
crew.
There are no IMAX In-Cabin Camera or ICBC problems or issues at this time.
DTO's (Development Test Objectives)
DTO 648 Electronic Still Camera Photography Test (with downlink) - Performing
as planned.
DTO 700-2 Laser Range and Range Rate Device - Performing as planned.
DSO's (Detailed Supplementary Objectives)
DSO 624 Cardiovascular Responses to Submaximal Exercise - Was scheduled
and assumed completed.
original signed by
Jim Bates
STS-61 Flight Integration Manager
-----------------------------
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