The Kedah Fire and Rescue Department (JBPM) has launched a search and rescue (SAR) operation for the man, identified as Khairul Nizam Jaffar, 41.
Langkawi JBPM Zone 4 chief Mohd Zamri Abd Ghani said they were alerted to the incident at 1.15 pm and rescuers reached the location about 15 minutes later.
"The victim, a cable car maintenance worker, is believed to have fallen off (the platform) while doing maintenance work on level two.
"It is estimated that the victim fell from a height of 40 to 50 metres, and his condition is still unknown as the location is deep below," he said in a statement.
He added that the team is in the process of descending to search for and locate the victim before bringing him to a safe location for further action.
-- BERNAMA