NASA and SpaceX are adjusting the Crew-13 launch to the International Space Station after an oxidizer leak on Dragon’s propulsion system was found during standard prelaunch processing, NASA said August 29, 2026. The finding is not a last-second abort on the pad and not a failure in flight. It is a ground discovery, made while the spacecraft was being put through the ordinary checks that come before a crew is allowed to ride it. Those checks exist so that a leak of this kind is found in Florida rather than in orbit.
Crew-13 remains a four-person rotation to the station. The vehicle remains a SpaceX Dragon. The rocket remains a Falcon 9. The pad remains Space Launch Complex 40 at Cape Canaveral Space Force Station in Florida. What has changed is the calendar. The agencies are no longer holding a public target. A new target date will be announced once available. Until then, the mission is in the hands of joint test teams rather than a countdown clock.
An oxidizer leak found in standard processing
The problem is specific. It is an oxidizer leak on Dragon’s propulsion system. Oxidizer is the half of a spacecraft’s propellant pair that supplies oxygen to the burn. In a Dragon, that system is not a spectator. It is how the capsule points, how it makes the burns that close on the station, and how it would pull away if a rendezvous had to be called off. A leak in that plumbing is a leak in the machinery that keeps a crew spacecraft a spacecraft rather than a ballistic shell.
NASA’s wording places the discovery in standard prelaunch processing. That phrase matters. It means the leak was not unearthed by an accident or by a last-minute special inspection invented for this flight. It was found because the processing flow is designed to look. Tanks are prepared. Lines are checked. Sensors and visual inspections are part of the job. When something does not stay where it belongs, the flow stops being routine and becomes a hold.
The agencies are adjusting the launch, not canceling Crew-13. Adjustment is a scheduling word. It says the destination is still the International Space Station, the crew is still the crew named for this flight, and the hardware is still the hardware that was being prepared. What is not being adjusted is the safety bar. A propulsion leak found on the ground is a reason to stay on the ground until the system is understood.
Dragon is SpaceX’s crew capsule. Falcon 9 is the booster that lifts it. Together they are the ride NASA has used to send astronauts to the station from Florida. Crew-13 is the next numbered increment of that sequence. An oxidizer leak does not rewrite that architecture. It rewrites the stretch of time between processing and liftoff.
Joint tests, data review, and rework before flight
Joint NASA and SpaceX teams are running additional tests and data review and will complete any necessary rework before flight. Those three clauses are the entire work statement NASA put on the record on August 29, 2026. Tests ask the hardware what it is doing now. Data review asks the records what it did when the leak appeared. Rework is the physical answer if the tests and the records say a part, a seal, a line, or a procedure has to change.
The teams are joint because the capsule is SpaceX’s and the crew and the station are NASA’s responsibility as well. Neither side can clear the vehicle alone in the public account. Additional tests imply that the standard processing that found the leak is not, by itself, enough to decide what happens next. Something extra is being run. Data review implies that the leak is not only a stain on a fitting. It is a dataset: traces, times, inspection notes. Rework is conditional — any necessary rework — which is another way of saying the teams have not, in this announcement, already declared a particular repair complete. They will do what the tests and the review require, and they will do it before flight.
A new target date will be announced once available. That is a refusal to guess. NASA did not offer a window, a week, or a not-earlier-than. The launch is being adjusted; the adjustment is not yet a number on a calendar. Anyone waiting for Crew-13 is waiting for that announcement, not for speculation about how long an oxidizer leak takes to clear. The public fact is the hold. The public fact is also that the hold is not open-ended in purpose. It is bounded by tests, review, and rework, and then by a new date when those are done.
Until that date exists, prelaunch processing is no longer standard. It is investigative. The same pad, the same Dragon, and the same Falcon 9 that were in the plan remain in the plan. The sequence has a new gate.
Commander, pilot, and two mission specialists
NASA astronauts Jessica Watkins and Luke Delaney will serve as commander and pilot, joined by CSA astronaut Joshua Kutryk and Roscosmos cosmonaut Sergey Teteryatnikov as mission specialists. The roster is international by design. Two seats are NASA’s. One is the Canadian Space Agency’s. One is Roscosmos’s. Crew-13 is therefore not a U.S.-only taxi. It is a four-person increment that binds station partners into a single Dragon.
Watkins is commander. Delaney is pilot. Those two roles are the ship’s command chain for launch, rendezvous, docking, and the ride home. Kutryk and Teteryatnikov are mission specialists: the seats that complete the crew and the national mix. CSA is Canada’s space agency. Roscosmos is Russia’s. A leak on the American commercial capsule delays all four, because all four ride the same vehicle to the same laboratory.
The names are not placeholders. NASA’s August 29 statement treats them as the crew of record while the launch is adjusted. There is no substitution in the announcement. Jessica Watkins remains commander. Luke Delaney remains pilot. Joshua Kutryk remains the CSA mission specialist. Sergey Teteryatnikov remains the Roscosmos mission specialist. The delay is a delay of their flight, not a recasting of it.
After docking, Crew-13 joins Expedition 75. That is the station-side identity of the mission. A Dragon crew does not visit and leave as a tour group. It docks and becomes part of the long-duration expedition already numbered on the station. Expedition 75 is the increment Crew-13 is meant to enter. The oxidizer leak sits between that plan and the hatch. Until the propulsion system is cleared, the four cannot become Expedition 75 by this vehicle on the old timeline.
The partnership in the seats is the partnership on the station. NASA, CSA, and Roscosmos are all in the Crew-13 list of who is flying. SpaceX is in the list of what they are flying. Joint teams on the ground now match that mix in a narrower way: NASA and SpaceX together on the leak, while the Canadian and Russian flyers wait on the same processing outcome as their NASA commander and pilot.
Quarantine about two weeks before flight, from Houston
The crew enters quarantine about two weeks before flight from Johnson Space Center in Houston. That is a health gate, not a propulsion gate. Johnson is where NASA’s crew operations live. Houston is where the two-week clock would start once a flight date is real enough to count backward from. About two weeks is the published margin: isolation meant to keep a cold, or something worse, off the station.
The oxidizer leak and the quarantine are different kinds of delay. The leak is hardware. The quarantine is biology. One is in Florida, on Dragon’s propulsion system. The other is in Houston, around the four people. They only meet on the calendar. If the launch date moves, the quarantine start moves with it, because the crew enters quarantine about two weeks before flight, not two weeks before a date that no longer holds.
Johnson Space Center is not the launch site. It is the crew’s home base for this purpose. Cape Canaveral Space Force Station is where the Falcon 9 and Dragon are supposed to leave the ground. The geography of Crew-13 is therefore split: Houston for the people in the final stretch, Florida for the vehicle, and the International Space Station for the destination after docking. An oxidizer leak found in prelaunch processing is a Florida problem that reaches Houston by moving the two-week quarantine and reaches the station by moving when Expedition 75 receives these four.
There is no new medical detail in NASA’s account. The quarantine rule is the same rule it was before the leak. What the leak does is keep that rule from attaching to a firm liftoff. About two weeks before flight is a formula that needs a flight.
Falcon 9, Dragon, and Space Launch Complex 40
Liftoff is planned aboard SpaceX’s Dragon on a Falcon 9 from Space Launch Complex 40 at Cape Canaveral Space Force Station in Florida. Every noun in that sentence is still the plan. NASA and SpaceX are adjusting when, not what or where.
Space Launch Complex 40 is a Cape Canaveral pad, on the Space Force station that occupies the Cape’s launch range. It is SLC-40, a workhorse site for Falcon 9. Dragon sits on top of that booster. The combination is the NASA crew ride from Florida to the station under this arrangement. Crew-13 was always that stack from that complex. The oxidizer leak does not send them to another pad or another rocket in the facts NASA released on August 29, 2026.
Cape Canaveral Space Force Station is the installation. SpaceX is the launch provider. NASA is the agency that named the crew and the expedition and that, with SpaceX, is running the additional tests. The leak is on Dragon’s propulsion system, which is the capsule, not the Falcon 9 first stage. The announcement does not describe a booster problem. It describes a spacecraft problem found during processing of the spacecraft. The Falcon 9 remains the planned launcher. SLC-40 remains the planned pad. Florida remains the planned state. The International Space Station remains the planned orbiting port.
Adjusting a launch from SLC-40 still means, eventually, a countdown at SLC-40. The additional tests and data review are what stand between the present hold and that countdown. Necessary rework, if the data demand it, would be done on the propulsion system that leaked, and then the same Dragon would still be the vehicle that is supposed to lift off on a Falcon 9 from that complex.
Four faces, a plaque, and a station-module mockup
An August 5 training photo shows the four with their mission plaque inside a station-module mockup. The picture is older than the leak announcement. NASA spoke on August 29, 2026. The photo is dated August 5. In that image the crew is already a crew: Watkins, Delaney, Kutryk, Teteryatnikov, together, with the plaque that identifies Crew-13, inside a mockup that stands in for the station they are training to enter.
A station-module mockup is not the International Space Station. It is the ground copy, the place where a crew learns the hatches, the racks, and the traffic of a module without leaving Earth. The mission plaque is the piece of flown identity a crew poses with before the flight that is supposed to carry it. Together they are a statement that Crew-13 had already reached the late-training stage in which the four are photographed as a unit assigned to a named increment.
The leak does not erase that photograph. It freezes the meaning of it. The four in the mockup are still the four on the roster. The plaque is still the Crew-13 plaque. The destination in the mockup is still the destination after docking: the station, and Expedition 75. What the August 29 statement adds is that the path from the mockup to the real module now runs through additional tests, data review, and any necessary rework on an oxidizer leak found in standard prelaunch processing.
Training photos are how agencies show a crew that is real before a launch date is sacred. This one does that work. It also, now, shows what is waiting. Commander and pilot from NASA, a CSA mission specialist, a Roscosmos mission specialist, a plaque, a mockup of the place they are meant to join. The Falcon 9 at Space Launch Complex 40 is the missing piece in the picture because the picture is training, not a pad shot. The missing piece on the calendar is the new target date.
A hold without a substitute date
NASA and SpaceX are adjusting Crew-13. That is the whole public operational decision as of August 29, 2026. The cause is an oxidizer leak on Dragon’s propulsion system, found during standard prelaunch processing. The response is joint additional tests and data review, then any necessary rework before flight. The calendar consequence is that a new target date will be announced once available. There is no substitute date in the announcement, and there is no substitute crew.
Jessica Watkins remains commander. Luke Delaney remains pilot. Joshua Kutryk remains the Canadian mission specialist. Sergey Teteryatnikov remains the Roscosmos mission specialist. After docking they still join Expedition 75. They still enter quarantine about two weeks before flight from Johnson Space Center in Houston. Liftoff is still planned aboard SpaceX’s Dragon on a Falcon 9 from Space Launch Complex 40 at Cape Canaveral Space Force Station in Florida. The August 5 training photo still shows the four with their mission plaque inside a station-module mockup.
What is not still true is that processing can be called standard. Standard processing found the leak. Additional processing will decide when Crew-13 may fly. Until NASA and SpaceX announce a new target date, the International Space Station will wait on a Dragon that is being tested, reviewed, and, if necessary, reworked on the ground rather than loaded for a countdown at Complex 40.
The delay is a propulsion delay. It is not a crew delay in the sense of a recast. It is not a destination delay in the sense of a new orbit. It is the kind of delay meant to be absorbed on the ground: find the oxidizer leak in prelaunch processing, put joint teams on the data, finish the rework, and only then name the morning in Florida when four people leave Houston’s quarantine for a Falcon 9 and a station expedition already numbered 75.