File virgo_sheet1.txt -- Last modified Fri Aug 18 14:54:34 1995


                   COMMISSIONING PHASE BLOCK SHEET

1. INSTRUMENT AND BLOCK NUMBER: VIRGO, Block 1

2. BLOCK IDENTIFICATION: VIRGO Early Switch-on

3. PURPOSE: Early switch-on to protect SPM and enhance outgassing

4. SUB-BLOCKS: (see Note 1)
   NR.   IDENTIFICATION
   1.1   Switch-on, receive daily pulse
   1.2   Continue switch-on

5. SUB-BLOCKS TABLE: (see Note 2)
   NR. - DURATION - PREVIOUS - COMMANDING - TELEMETRY - POINTING
   1.1   1:00         N/A       PROC          M          None
   1.2   2:00         Nom.+(1)  PROC          M          None

   (1) Receive daily pulse previously at 0:00

6. SCHEDULING REQUIREMENTS: (see Note 3)
   1.2 one day after 1,1, with daily pulse (at 24:00 UT) in between

7. SPECIAL REQUIREMENTS: (see Note 4)
   Requires coordination with FOT
   Daily pulse received before 1.2 to be executed

8. SUCCESS CRITERIA AND/OR EXPECTED OUTPUT:
   VIRGO switched-on and cover released, HK normal

9. RELEVANT PROCEDURES
   PROC1, 6, 7, 8, 9, 10, 11, 18
   
10. CROSS-REFERENCE TO TEST SHEETS: (list identifiers for test sheets)
     N/A (done with the FOT Procedures)


11. RELEVANT SECTION OF TIMELINE (backpage)

;
;
; ***** edited 22 February 1995 for the SOWG Meeting, GSFC 23/24-Feb-1995 
; ***** re-edited as input for the cruise phase planning 10 March 1995
; ***** new version with Blocks etc. 2 June 1995
; Time-line has the required format: TIME # ACTION # COMMENT
; Time has the format: ddd & hh:mm:ss, or ddd, or ddd & hh, or ddd & hh:mm
; ***** times are given in UTC: 14:00-22:00 corresonds to GSFC working hours
; ***** that is the 8h contact time
; PROCx: are TSTOL procedures described in: 
;	SOHO/VIRGO FOT PROCEDURES, VIR-PMO-DAT/G-111, issue 2.2, 25 May 1995 
;	(some update is needed, the updated version will be available by 
;	9 June 1995: change PROC 19 and 20; define PROC22, 23, 24) 

BLOCK1 -- VIRGO EARLY SWITCH-ON

BLOCK1.1 -- SWITCH-ON, RECEIVE DAILY PULSE
 
      4 & 21:00 # PROC1: Power on, load day of mission; enable
;			 start-up with daily pulse; 
      4 & 21:20 # PROC6: SPM-A switch on and heaters on; 
      4 & 21:40 # PROC7: SPM-B switch on and heaters on; 
      4 & 22:00 # End VIRGO-FOT activities
;			at 5 & 00:00 (24h pulse of S/C) the experiment 
;			will be synchronized with the daily pulse
; 

BLOCK1.2 -- CONTINUE SWITCH-ON

      5 & 14:00 # PROC8: PMO-B switch on
      5 & 14:30 # PROC9: PMO-A switch on 
      5 & 14:25 # PROC10: LOI switch on
      5 & 14:50 # PROC11: DIARAD switch on
      5 & 15:05 # PROC18: Cover release (for nominal it takes 25 min
;			  for redundant +20 min), test with short opening 
;			  of PMO-A cover
      5 & 15:50 # End VIRGO FOT activities
;			 
;	outgassing of VIRGO instruments with cover closed until after MCC2;
;	  instruments are running and electrically tested; in principle
;	  no commanding needed (only if something unexpected happens)
;
;

NOTES:

Note 1: Sub-blocks are functional units within a block. Operations can
        be interrupted between blocks, but usually not within a block.

Note 2: In this table the following information is sought:

    DURATION:   Estimation of time needed (dd & hh:mm), without contingency.
                 
    PREVIOUS:   Previous (sub)block(s) necessarily completed before the
                present subblock. Nominal (entry: Nom) is all (sub)blocks
                with lower number. Exceptions are noted with X (i.e.
                X 2.5, 2.6 means, all previous subblocks need be completed,
                except 2.5 and 2.6)  

    TELEMETRY:  Telemetry mode and submode required. Options: High (H),
                Medium (M), Low (L). For submodes: 1,2,3 (??). Nominal
                during cruise phase is H2 after ?? days, M between
                12 hours and ?? days, and L before 12 hours after launch.

    COMMANDING: Commanding mode required. Options are NRT dedicated
                (entry NRT-d), NRT shared (NRT-s), STOL procedure (entry:
                PRO and procedure identifyer), no commanding, for example
                monitoring  HK, or outgassing  (entry: None). Others ??

    POINTING:   Pointing requirements: none (entry: None), or nominal
                to Sun with no accuray guaranteed during cruise (entry:
                Nom). Other options are: no interference by other 
                instruments or reaction wheels (No-I), and ??

    SCHEDULING: Any scheduling requirements, such as at a certain time
                after launch, before or after MCC2, 

Please leave entries blank only when the information is not known, not
for nominal (entry: Nom), or not applicable (N/A), or obvious cases (they
may not be obvious to others). Please use footnotes to the table if entry 
does not fit into table.

Note 3: Describe any scheduling requirements, for example preferred, earliest
        and latest time for early switch-on activities, scheduling before or
        after MCC2, preferred time or preferred interval with respect to     
        previous activities (for example intervals between intercalibrations),
        etc.??                   

Note 4: Describe any special circumstances, for example when an activity
        is to be continued during non-contact hours, under automatic
        control, when coordination with other experiments or the FOT (for
        SVM operations) is required, etc.