Last year, Boeing starred in a space drama that kept the world in suspense: the Starliner crisis. After discovering leaks and failures in its propellers, NASA took months between deliberations, tests and safety meetings to finally decide that the astronauts Butch Wilmore and Suni Williams They would not return in their ship, but would wait for SpaceX’s Crew-9 mission to return. Now, China has faced a similar scenario that it has resolved in a few days. The haste has its explanation.
A cracked window. The news broke on November 5. The Shenzhou-20 mission, crewed by Chen Dong, Chen Zhongrui and Wang Jie, was preparing to return to Earth after six months at the Chinese Tiangong space station. However, during inspections prior to undocking, the astronauts detected an anomaly that so it was not made publicbut that we now know: “small cracks” in the external glass of one of the capsule windows.
After analyzing photographs and running simulations in wind tunnels, CMSA (China Manned Space Agency) engineers determined that the damage had possibly been caused by the impact of micrometeoroids or small fragments of space junkcompromising the structural integrity of the ship. The conclusion put Chinese astronauts in a bind: the capsule “did not meet the conditions for a safe manned return.”
The game of chairs in orbit. Unlike the International Space Station, the Tiangong space station cannot accommodate six astronauts for a long time, so the Shenzhou-20 crew had to be brought in as soon as possible.
China always maintains a Shenzhou ship and a CZ-2F rocket ready to take off in case of emergency. However, on this occasion, the CMSA ruled out launching the new Shenzhou-22 spacecraft to bring back the three stranded astronauts because it “included instrument upgrades for which the outgoing crew had not been trained.”
The solution chosen to bring the crew back was, therefore, to do so aboard the Shenzhou-21 ship that had arrived with three other astronauts two weeks earlier. A literal change of chairs (they had to move the adapted seats from one ship to another) and with a single sacrifice: leaving the three crew members of the Shenzhou-21 at the mercy of a compromised ship (the Shenzhou-20) in the event of an emergency.
In summary. The three outgoing astronauts They landed safely on November 14 aboard the ship of his three incoming companions. The reason why this exchange of ships was faster than in the case of the Starliner or, a year earlier, the Russian Soyuz MS-22, was, on the one hand, that the Tiangong station is not yet large enough for six people to live in, and on the other, that the replacement ship was already there.
What cost NASA months of risk analysis and public relations management with Boeing, China solved in a matter of days thanks to the availability of spacecraft. The logistical sacrifice is that the crew of the Shenzhou-21 (which will stay in space for six months) has had to give up their “lifeboat” until the Shenzhou-22 spacecraft is launched without a crew as a new return vehicle. The Shenzhou-20 will return empty to analyze its damage on the ground, if it ultimately survives re-entry.
Image | CGTN
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