ADELAIDE, Australia — India expects its PSLV rocket to return to flight in December after its Aug. 31 failure, a relaunch date that a senior launch official said could be sooner were it not for the readiness of the next main payload.

Radhakrishnan Durairaj, director of launch services and missions at Antrix Corp., the company that manages commercial launch sales, said the inquiry into why the PSLV’s fairing did not separate during the last launch would be concluded within weeks.

The failure left an Indian positioning, navigation and timing . . .

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