尊龙凯时人生就是搏

Ó¢ÓïÔĶÁ£ºÐǼʿͻú(Starliner)µÄÉú³¤

The development of Starliner has not gone smoothly. During its first in 2019, which didn¡¯t have people on board, it to reach its orbit. The was later traced to an onboard clock was set incorrectly ¡ª causing the Starliner¡¯s thrusters to fire at the wrong time.

Starliner never made it to the ISS on that trip, and NASA required a second test flight without any astronauts. When it launched again in 2022, two thrusters on Starliner failed to fire as expected. It successfully switched to backup thrusters and docked to the space station.

Astronauts were supposed to launch last year, but then Boeing found two more problems with the spacecraft: issues with the parachute that allow to float back to Earth, and tape used to wiring that posed a fire risk. Fixing both issues pushed back the launch to this spring.

Finally, Williams and Wilmore were strapped in on May 6, when more problems appeared ¡ª a valve on the rocket launching Starliner had to be replaced, and mission engineers discovered the Starliner itself was leaking helium.

Helium gas is used to pressurize Starliner¡¯s propulsion system, and NASA took several weeks to the leaks weren¡¯t enough to the helium to run out during the mission.

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