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Home NASA

Falcon 9 Quickly Returns to Flight

July 28, 2024
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Falcon 9 Quickly Returns to Flight
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Starlink 10-9 triumphantly returns the Falcon 9 fleet to operational service as one other rocket (foreground) prepares for launch. Credit score: SpaceX.

Two weeks after a SpaceX Falcon 9 rocket suffered a uncommon mission-ending mishap, one other one of many slender rockets lifted off from Florida’s House Coast.  Inside an hour, it efficiently positioned its payload of 23 Starlink satellites into their meant orbit.  The difficulty-free flight marked the conclusion of an unprecedentedly swift mishap investigation and return-to-flight marketing campaign.  It additionally has outsized significance for organizations throughout the civil, industrial, and army segments of the area trade, which have come to rely closely on the workhorse rocket.  With the return of the Falcon 9, SpaceX is poised to renew a record-breaking cadence of launches because it continues constructing the Starlink constellation whereas putting crew and cargo into orbit.

Massive chunks of ice are liberated from the only Merlin Vacuum engine in the course of the Starlink 9-3 mission. The leak finally introduced a untimely finish to the flight. Credit score: SpaceX.

16 days in the past, the spaceflight world was shocked when a Falcon 9 unexpectedly failed in the course of the Starlink 9-3 mission.  The second stage of the rocket was unable to put its Starlink satellites right into a secure orbit after its single Merlin Vacuum engine failed, and the spacecraft all reentered the ambiance and disintegrated inside a day.  The loss broke a string of 325 profitable Falcon 9 launches, which greater than doubled the earlier document of consecutive profitable flights set by Russia’s Soyuz-U booster.  

Inside hours, SpaceX and the Federal Aviation Administration (FAA), the regulatory physique charged with overseeing industrial launches, had begun a mishap investigation.  They quickly closed in on the reason for the engine failure [1].  A small line of tubing on the second stage connects the second stage’s liquid oxygen plumbing to a stress sensor.  Throughout a nominal mission, the sensor helps be certain that the propellant tanks are feeding oxidizer to the engine on the correct charge.  Nevertheless, throughout Starlink 9-3, the clamp securing this phase of tubing in place was too unfastened.  Extreme vibration finally brought on the sense line to rupture, spewing a stream of liquid oxygen onto the engine itself.  

B1069 lifts off from Pad 39A, returning the Falcon 9 fleet to flight. Credit score: SpaceX.

The cryogenic liquid oxygen, in flip, had a temperature of -297 levels Fahrenheit (-183 levels Celsius). When it condensed on the engine, it cooled the engine ignition system under its commonplace working temperature.  When the Merlin Vacuum engine relighted to try to put the Starlink satellites into their meant round orbit, it skilled what SpaceX known as a “onerous begin,” the place the engine experiences a sudden jolt slightly than a mild ignition.  The top outcome was what CEO Elon Musk known as a “speedy unscheduled disassembly” of the engine which didn’t have a big sufficient magnitude to destroy the remainder of the stage.

SpaceX was in a position to attain these conclusions in document time.  For distinction, the primary two Falcon 9 anomalies on CRS-7 and AMOS-6 have been resolved in six and 4 months, respectively.  The final lack of a Rocket Lab Electron, one other rocket with an in depth flight historical past, resulted in a three-month stand-down.  SpaceX’s speedy investigation was aided by a singular program which compiles information from each Falcon 9 flight [2].  It then autonomously compares related missions and flags any discrepancies for overview by SpaceX’s engineering crew.  This software program is very efficient within the case of Starlink missions, which regularly launch into equivalent orbital planes.  Whichever instruments have been utilized, the SpaceX engineering crew was in a position to rapidly find and resolve the reason for the Starlink 9-3 anomaly.

23 flat-packed Starlink satellites have been deployed in the course of the Starlink 10-3 mission. Credit score: SpaceX.

The answer to the difficulty was comparatively easy.  For upcoming Starlink flights the place human lives are usually not in danger, SpaceX can merely take away the stress sensor and its accompanying feed line, sacrificing some redundancy.  The lack of the sensor doesn’t intrude with the Flight Termination System that protects public security by destroying the rocket if it veers off target.  SpaceX really useful the launch of an indication mission to find out that the rocket may safely return to operation.  The FAA concurred with the corporate’s evaluation, setting the stage for at the moment’s flight.

The burn of the second-stage Merlin Vacuum engine seemed to be nominal. Credit score: SpaceX.

SpaceX chosen the Starlink 10-9 mission to function Falcon 9’s return to flight.  At present’s mission was just like a lot of SpaceX’s latest launches.  It deployed 23 Starlink satellites right into a round orbit utilizing two burns of the second stage engine.  Over 6,000 Starlink satellites are at present in orbit.  They supply mobile service to clients starting from rural owners missing broadband entry to cruise ships at sea to the U.S. army and American allies resembling Ukraine.  Nevertheless, whereas the Starlink 10-3 mission profile resembled a typical constellation deployment mission, it carried outsized significance for SpaceX and its many purchasers.  The underlying goal of at the moment’s mission was to display that Falcon 9 was able to resume its dependable operational service.

B1069 rolls out for its first launch, CRS-24. Credit score: SpaceX.

Starlink 10-9 bought underway simply after midnight, at 12:21 AM Jap commonplace time.  The Falcon 9 booster B1069, a veteran of 16 prior flights, lifted off from historic Launch Advanced 39A.  The flame-scarred pad, which noticed the triumphant launch of Apollo 11 simply over 55 years in the past, added to its storied historical past with the return of its most prolific tenant launch automobile.  B1069 went supersonic 55 seconds after launch.  12 seconds later, it handed by Max-Q, the purpose at which the ambiance exerts its most aerodynamic stress on the rocket’s construction.  Two and a half minutes after liftoff, the reusable booster was jettisoned, leaving the second stage to proceed its climb to orbit.  

B1069 returns to a gentle touchdown at Touchdown Zone 1 following its mission for OneWeb, a British megaconstellation. Credit score: Jeff Seibert/AmericaSpace.

Persevering with on its parabolic trajectory, B1069 reoriented itself to put its engines in its route of journey.  A 3-engine entry burn decreased its velocity, limiting the heating and the aerodynamic forces which it skilled throughout reentry.   A single-engine touchdown burn then allowed it to softly alight on “Simply Learn the Directions,” one in every of SpaceX’s floating restoration platforms.  It was the 17th touchdown for a booster with a colourful historical past.  B1069 debuted throughout CRS-24, a cargo resupply flight certain for the Worldwide House Station.  Its first flight was almost its final, because it suffered a tough touchdown which brought on it to record to 1 facet whereas standing upright and which broken no less than two Merlin engines.  The booster was faraway from energetic service for 250 days and returned to the fleet in August of 2022.  B1069 has since settled right into a cadence of routine launches as one in every of SpaceX’s 15 energetic Falcon 9 boosters.  Thus far, it has deployed 4 massive geosynchronous communications satellites, 40 satellites for the OneWeb megaconstellation, and 13 clutches of Starlink satellites.

B1069 launches SpaceX’s record-breaking 96th and remaining mission of 2023. Credit score: Jeff Seibert/AmericaSpace.

In the meantime, the second stage accelerated in direction of orbit.  Its engine minimize off on schedule, simply shy of 9 minutes after liftoff.  It reignited 42 minutes later to put the Starlink satellites right into a secure, round orbit.  The flight seemed to be flawless, and no traces of the liquid oxygen leak have been seen within the movies which have been captured by two cameras on the second stage.  “Again within the saddle!”, Musk exclaimed [3].

The success of Starlink 10-9 ought to clear the Falcon 9 to renew doing what it does greatest: putting payloads into orbit for SpaceX and its clients at an unprecedented charge.  The Falcon 9 crew will spend a day reviewing telemetry to verify that the return to flight didn’t encounter any points.  The corporate is getting ready for a salvo of two launches which is able to from KSC and Vandenberg House Pressure Base in California as early as Sunday, July 28th.  As a result of two-week stand-down, it’s unclear whether or not SpaceX will nonetheless be capable of obtain its aspirational purpose of launching 144 flights in 2024.  Nevertheless, barring unexpected difficulties, it’ll definitely exceed 100 flights in a calendar 12 months – a feat which has by no means been achieved by every other rocket.

Mission Specialists Stephanie Wilson and Aleksandr Gorbunov, Pilot Nick Hague, and Commander Zena Cardman will fly to the ISS on the Crew-9 mission. Credit score: NASA/Invoice Stafford/Robert Markowitz.

SpaceX might require just a few additional weeks earlier than it’s comfy with launching its most valuable cargo.  The subsequent piloted flight of the Crew Dragon capsule will possible be NASA’s Crew-9 mission.  Previous to the launch of Crew-9, NASA elected to carry out its personal overview of the Starlink 9-3 anomaly to verify that Falcon 9 meets the company’s necessities for flight security.  It’s unclear whether or not the liquid oxygen stress sensor will must be reinstalled for human missions.  Crew-9 Commander Zena Cardman, Pilot Nick Hague, and Mission Specialists Stephanie Wilson and Aleksandr Gorbunov are at present slated to depart from Pad 39A as early as August 18th.  The launch window extends into early September, granting SpaceX and NASA some flexibility with the launch schedule.  

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