Flight Sequence Program: Difference between revisions
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{|class="wikitable" | {|class="wikitable" | ||
!Event||Time from Event||Stage||Channel | !Event||Time from Event||Stage||Channel||Remarks | ||
|- | |- | ||
| | |Aux Hydraulic Pump Flight Mode On||-22.0||3 (S-IVB)||28||The auxiliary hydraulic pump is turned on to center the J-2 engine for damping | ||
|- | |- | ||
|Engine | |Engine Mainstage Control Valve Open On||-0.2||3 (S-IVB)||30||Commands open main LOX valve | ||
|- | |- | ||
|Engine He Control Valve Open||0.0||3 (S-IVB)||109||Provides pneumatics to open main LOX valve | |||
|- | |||
|LOX Tank NPV Valve Open On||10.0||3 (S-IVB)||42||The LOX NPV valve is latched open, if it is desired to do so | |||
|- | |||
|LOX Tank NPV Valve Open Off||12.0||3 (S-IVB)||37||Only if opened in the previous step | |||
|} | |||
'''Terminate LOX Dump (Saturn IB)''' | |||
Prerequisites: - | |||
{|class="wikitable" | |||
!Event||Time from Event||Stage||Channel||Remarks | |||
|- | |||
|Engine Mainstage Control Valve Open Off||-1.0||3 (S-IVB)||65|| | |||
|- | |||
|Engine He Control Valve Open Off||0.0||3 (S-IVB)||110|| | |||
|- | |||
|Aux Hydraulic Pump Flight Mode Off||2.0||3 (S-IVB)||29|| | |||
|} | |||
'''Initiate LH2 Tank Blowdown Vent (Saturn IB)''' | |||
Prerequisites: - | |||
{|class="wikitable" | |||
!Event||Time from Event||Stage||Channel||Remarks | |||
|- | |||
|LH2 Tank Vent Valve Open||0.0||3 (S-IVB)||38|| | |||
|} | |||
'''Terminate LH2 Tank Blowdown Vent (Saturn IB)''' | |||
Prerequisites: - | |||
{|class="wikitable" | |||
!Event||Time from Event||Stage||Channel||Remarks | |||
|- | |||
|LH2 Tank Vent Valve Close||-3.0||3 (S-IVB)||76|| | |||
|- | |||
|LH2 Tank Ven Valve Boost Close On||0.0||3 (S-IVB)||77|| | |||
|- | |||
|LH2 Tank Vent Valve Boost Close Off||2.0||3 (S-IVB)||78|| | |||
|} | |} | ||
Latest revision as of 20:23, 5 February 2025
The flight sequence program is a series of scheduled commands that is being sent from the LVDC to the stages of the Saturn vehicle (S-IB/C, S-II, S-IVB and IU) during a mission. They are scheduled in various time bases. In NASSP the LVDC loads a flight sequence program file that is valid for a given mission. The file can be found under Config/Project Apollo.
TBD:
-Explain time bases
-Explain stage code
-List of all available Saturn IB and V commands
Sequences
Initiate LOX Dump (Saturn IB)
Prerequisites: Passivation Enable, Stage 3 (S-IVB), Channel 85
| Event | Time from Event | Stage | Channel | Remarks |
|---|---|---|---|---|
| Aux Hydraulic Pump Flight Mode On | -22.0 | 3 (S-IVB) | 28 | The auxiliary hydraulic pump is turned on to center the J-2 engine for damping |
| Engine Mainstage Control Valve Open On | -0.2 | 3 (S-IVB) | 30 | Commands open main LOX valve |
| Engine He Control Valve Open | 0.0 | 3 (S-IVB) | 109 | Provides pneumatics to open main LOX valve |
| LOX Tank NPV Valve Open On | 10.0 | 3 (S-IVB) | 42 | The LOX NPV valve is latched open, if it is desired to do so |
| LOX Tank NPV Valve Open Off | 12.0 | 3 (S-IVB) | 37 | Only if opened in the previous step |
Terminate LOX Dump (Saturn IB)
Prerequisites: -
| Event | Time from Event | Stage | Channel | Remarks |
|---|---|---|---|---|
| Engine Mainstage Control Valve Open Off | -1.0 | 3 (S-IVB) | 65 | |
| Engine He Control Valve Open Off | 0.0 | 3 (S-IVB) | 110 | |
| Aux Hydraulic Pump Flight Mode Off | 2.0 | 3 (S-IVB) | 29 |
Initiate LH2 Tank Blowdown Vent (Saturn IB)
Prerequisites: -
| Event | Time from Event | Stage | Channel | Remarks |
|---|---|---|---|---|
| LH2 Tank Vent Valve Open | 0.0 | 3 (S-IVB) | 38 |
Terminate LH2 Tank Blowdown Vent (Saturn IB)
Prerequisites: -
| Event | Time from Event | Stage | Channel | Remarks |
|---|---|---|---|---|
| LH2 Tank Vent Valve Close | -3.0 | 3 (S-IVB) | 76 | |
| LH2 Tank Ven Valve Boost Close On | 0.0 | 3 (S-IVB) | 77 | |
| LH2 Tank Vent Valve Boost Close Off | 2.0 | 3 (S-IVB) | 78 |