Synopsis
On 24 June 2024, at 10:30 UTC, Malaysia Airlines flight MAS780, an Airbus A330-200 with registration 9M-MTW, departed from Kuala Lumpur International Airport en route to Suvarnabhumi Airport. The aircraft carried 179 persons, including crew and passengers. While cruising at flight level 400 (FL400), the cabin pressurization was lost. The serious incident occurred at 11:00 UTC, approximately 11 nautical miles from Hat Yai International Airport.
Sequence of Events
Upon loss of cabin pressurization, the pilots executed an emergency descent and used their oxygen masks. However, the passenger cabin oxygen masks did not deploy automatically, nor did the pilots manually deploy them. The aircraft was not damaged, and there were no injuries or fatalities. The pilots subsequently returned to Kuala Lumpur International Airport and landed without further incident.
Investigation Status
The Aircraft Accident Investigation Committee under the Aircraft Accident and Incident Investigation Commission Thailand is conducting the investigation. The incident has been classified as a serious incident, specifically an event requiring the emergency use of oxygen by the flight crew. The State of Aircraft Design and Manufacture (France) and ICAO have been notified. A final report, including the cause and preventive recommendations, will be published at a later date.