17 April 2018
The State Administration of Science, Technology and Industry for National Defense finally confirmed publicly the cause of the CZ-5 failure from last summer: a quality issue in the structure of the turbopump in the YF-77 cryogenic engines of the Long March 5 core first stage.

Already during the IAC2017 in Adelaide, Australia, China confirmed that the failure of the CZ-5 was related to the first stage's core engines. In November 2017, unofficial reports emerged that the cause of the failure was pin-pointed and the talk was about the turbo pump. Several space expert websites (compare: spaceflight101.com) wrote already earlier this year that "a structural problem causing the turbopump rotor shaft enclosure cap within one of the YF-77 engines to break off and created a blockage within the propellant line."

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