This is the best summary I could come up with:

According to a preliminary report released Saturday by the National Transportation Safety Committee (KNKT), both the pilot and co-pilot fell asleep simultaneously for 28 minutes during a flight from Kendari in Southeast Sulawesi province to the capital Jakarta on January 25, causing navigational errors as “the aircraft was not in the correct flight path.”

The flight, BTK6723, lasted two hours and 35 minutes, and successfully landed in Jakarta, according to Antara and the preliminary report.

Twelve minutes after the last recorded transmission by the co-pilot, the Jakarta area control center (ACC) tried to reach the aircraft, but there was no reply from the pilots, it said.

Around 28 minutes after the last recorded transmission, the pilot-in-command woke up and realized the plane was not in the correct flight path.

The preliminary report detailed that the pilot-in-command told the ACC that the flight had experienced a “radio communication problem” that had been resolved.

Flight crews of BTK6723 have also been grounded according to standard operating procedure pending further investigation, she added, according to the news agency.

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