Captain GK Ganjoor and First Officer Karamuzaman Jali were making landing preparations at 19:54, while at an altitude of over Batu Arang and descending toward Runway 33 at Subang Airport, when the crew reported to Subang Tower that an "unidentified hijacker" was on board, after someone knocked on the cockpit doors. Subsequently, the pilots were forced to cut off all communications by a group of hijackers who suddenly barged into the cockpit. The tower immediately notified the authorities, who made emergency preparations at the airport.