Extended ISS Stay for NASA Astronauts Amid Boeing Capsule Propulsion Troubles

Two NASA astronauts will remain at the International Space Station (ISS) longer than planned due to issues with Boeing's new space capsule. Engineers are working on resolving these problems, and NASA has not set a return date yet. The astronauts are reported to be safe.

Veteran NASA test pilots Butch Wilmore and Suni Williams launched aboard Boeing's Starliner capsule on June 5. This marked Boeing's first astronaut launch after years of delays. Initially, the test flight was supposed to last about a week for the astronauts to evaluate the capsule while docked at the ISS.

Starliner Capsule Issues

Problems with the Starliner's propulsion system have caused multiple delays in the return flight. These issues arose during docking when five of the capsule's 28 thrusters failed; all but one were restarted. Additionally, a small helium leak was detected during launch, and more leaks appeared during the flight.

Helium is crucial for pressurising fuel for the thrusters. Despite these issues, Boeing stated that they do not pose a concern for the return trip. NASA and Boeing need more time to gather data on these problems while the capsule remains docked.

Impact on Spacewalks

A planned spacewalk this week was cancelled due to a water leak in an astronaut's spacesuit. This unresolved issue has also led to postponing another spacewalk scheduled for next week. NASA and Boeing aim to avoid conflicts with spacewalks while addressing the Starliner's issues.

"We're not in any rush to come home," said Steve Stich, NASA's commercial crew programme manager. He emphasised that Wilmore and Williams are not stranded in space, adding that the Starliner is designed for missions lasting up to 210 days.

Ground Testing and Return Plans

Nasa initially stated that the Starliner could stay docked at the ISS for up to 45 days due to battery limits. However, in-flight tests have shown that this limit can be extended. Officials will not set a return date until ground tests of the capsule thrusters are completed in New Mexico.

The goal is to replicate the situation that occurred during docking to better understand and resolve the issues. "I want to make it very clear that Butch and Suni are not stranded in space," reiterated Stich.

Since retiring its space shuttle fleet, NASA has relied on private companies for astronaut transportation. Elon Musk's SpaceX has conducted nine taxi flights for NASA since 2020. NASA plans to alternate between SpaceX and Boeing for ferrying crews to and from the ISS.

The delay in returning Wilmore and Williams allows more time for troubleshooting and ensures their safety. Both NASA and Boeing are committed to resolving these technical issues before setting a new return date.