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23

12/9/81

TITLE ________________________
Project No.__________
Book No._______ 
  
From Page No. _____   STS-3 GAS
        
2 experiments: 
a) Thermal Switch parafin phase - change switch (zero pwr)
40W htrs to top plate until switched to heat pipes

b) Heat pulse inject 8hr pulse & watch propagation
60W  (also want to watch re-entry [[strikethrough]] pt [[strikethrough]] pulse - need to start a 4 1/2hr timer as close to D/O as poss)
                  
as of 12/9/81 timeline says   
2 runs of thermal switch 
1 runs of heat pulse 
Total 16 relay operations

Commands

STS-3 is unique because    
a) engr. eval nature
b) desire to avoid htr 1/f design mods
2 relay cntl decoders in can, 3 relays each
Pulse waveform: an ON from cntlr is immed. followed by OFF
Relay 3 HOT = [[strikethrough]] Relay [[strikethrough]] Thermal switch ON
5 HOT = Heat pulse ON
4 HOT = BOTH EXPTS OFF; IF NONE ACTIVE = TIME HACK

Interface test in OPF will use emergency shutdn mode from APC (crew controller)
-Cmd 99 shuts off all hot relays
-Key E successively then polls all relays O...N
       
Contacts    
Marianne Dyson -------------- Timeline
Dennis Krutsci -------------- JSC Ops (therm vac)
Greg Henry ------------------ RI - TPS CS2-724-011
Malcolm Johnson/Tom Levan --- Stowage JSC/KSC

Hangar S, South clean room     824-4976  
                
To Page No._____

Witnessed & Understood by me, ____________________
Date _________
Invented by ____________________
Recorded by ____________________
Date ____________

Transcription Notes:
---------- Reopened for Editing 2023-03-29 20:25:49 ---------- Reopened for Editing 2023-03-30 11:00:33