Air traffic controllers as well as other pilots tried to get in contact with the napping pilots to no avail
During preparation for the first leg of the flight from Jakarta to Kendari, the second-in-command pilot (SIC), a 28-year-old with roughly 1,600 hours of flying time, told the pilot in command that he did not have proper rest, according to a report by Indonesia’s National Transportation Safety Committee. The commanding pilot, a 32-year-old with roughly 6,300 hours of flying time, decided to allow the secondary to rest during that leg of the trip for approximately half an hour.
The one-way flight time for this flight varies from 3 hours and 10 minutes to 4 hours. So, the round-trip flight would be double that. Still in my humble opinion, discussions before the flight is underway about sleep time should not be acceptable.
On the flight back to Jakarta, which had 153 passengers and four flight attendants on board, the pilot in command (PIC) asked the secondary, who had napped during the first leg, if he could take a turn to rest. The SIC agreed that was fine, and after awakening, the pilot woke up and asked the other pilot if he wanted to nap, which he declined.
According to the official incident report, approximately 20 minutes later, the second pilot “inadvertently fell asleep” as they were roughly 36,000 feet in the air. Air traffic controllers as well as other pilots tried to get in contact with the napping pilots to no avail.