Spacex Falcon 9 Block 5 which carries 54 Starlink satellites is now targeted to be launched at 21:48 EDT on Wednesday, September 14 (01:48 UTC on September 15) after unfavorable weather rubbing efforts on Tuesday. This mission will be launched from the Space Launch Complex 40 (SLC-40) at the Space Force Cape Canaveral station in Florida. The booster that supports Starlink Group 4-34 is the B1067, which has been flown on the previous five missions. B1067 debuted on the CRS-22 mission and continued to launch flights Crew-3, Turksat-5B, Crew-4, and CRS-25.
To initiate the automatic launch sequence in the T-38 minute, the Director of SpaceX launch gave “GO” for loading propellan. In minutes T-35, a Rp-1 Kerosen which is cooled with a sub-dollar will be loaded into the two first and second stages, and the first stage will also begin to be loaded with liquid oxygen (LOX). In T-20 minutes, loading Rp-1 to the second stage will be completed, and large ventilation of Erector Transport (T/E) can be seen. This is to clean the T/E line from Rp-1 in preparation for the next second stage of fuel phase: At minutes T-16, the Lox will begin to be loaded to the second stage. After the lox loading is complete, Rp-1 in the first stage and the Lox at both stages will be closed up to T-90 seconds.
The next milestone of the launch sequence occurs in T-7 minutes, where the first stage of Falcon 9 starts the engine chill-booster flowing a small amount of Lox through the oxygen part of each M1D turbo pump, preventing the propellan flickering to the gas in the engine ignition, which can very damaging the engine. Furthermore, at T-1 minutes, the flight computer took over the countdown in the so-called “startup” and started the last prelaunch examination. At the same time, the propellant tank will press to match the pressure needed during the flight. After this is finished, the call out of the “tank is pressed for flights” can be heard.
Furthermore, the launch director will verify the final “go” for launch in T-45 seconds. Then in T-3 seconds, the engine controller sends the command to ignition from the first nine 1D 1D engine. In T-0.02 seconds, the engine and vehicle will run independently and ready for flights, and the vehicle will order the hydraulic launch clamps to be released at T0, allowing the vehicle to take off. After the liftoff, the vehicle will face the maximum aerodynamic pressure of Max-Q-Q-Momen on T+1 minute and 12 seconds. The first stage of Merlin 1D engine will remain on until T+2 minutes and 27 seconds, at which point a series of events occurs sequentially. First, the nine M1D engines will be closed, followed immediately after the separation of the stages. The second stage will then start a single M1D vacuum machine.
Fairings, which protects the charge from debris and heating atmosphere during climbing, will be separated from vehicles in T+3: 13. Both parts of the fairing use RCS and parachute boosters to rearrange the atmosphere and splashdown gently in the Atlantic Ocean. The fairing section will then be restored by the Spacex fairing recovery ship, Doug. Also after the separation of the stages, the first stage will use four grid fins and carry out a series of maneuvers to orient themselves properly to re -enter the earth’s atmosphere. At T+7: 07, the first stage of the burning starts and will continue for the next 31 seconds. The first stage will then slide back to Earth, continue to use the fin grid to orient itself to landing targets.
In T+8: 26, the first stage will start the third burns to slow down itself for soft landing on the SpaceX autonomous spaceport drone (ASDS) has just read the instructions (JRTI) off the coast of North Carolina. After the second stage reaches the desired parking orbit, the Cut Off Engine Second (SECO) will occur and the stage will briefly slide in preparation for the placement of the charge. The second stage then starts spinning over its X axis, before using four tension stems in T+15 minutes and 21 seconds. Because of the stage rotation, 54 Starlink satellites will have a variety of varying angular momentum, causing them to separate after the voltage rod is mobilized. Starlink satellite will now spend the following months to increase their orbit to Starlink Shell 4: 540 km circular orbit in a trend of 53.2 degrees. Spacex has at least two more missions in September, including at least one more Starlink mission and the TRANCHE 0 FLIGHT 1 Mission and Tracking Mission for the Space Development Agency (SDA).