SQ321 turbulence: 'Rapid' G-force changes, altitude drop likely caused injuries to unbelted passengers, crew

The interior of Singapore Airlines flight SQ321 is seen after an emergency landing at Bangkok's Suvarnabhumi International Airport in Thailand following extreme turbulence on May 21, 2024. have shown that"rapid" changes in gravitational force - up to three times that of Earth's - and an altitude drop of around 54m likely caused injuries to passengers and crew who were not belted up.

The investigators found that after SQ321 departed London, the flight was"normal" prior to the turbulence event. The pilots also observed an uncommanded increase in airspeed, which they addressed by extending the speed brakes, said MOT. experienced a rapid change in G as vertical acceleration decreased from positive 1.35G to negative 1.5G within 0.6 seconds.One second later, vertical acceleration changed from negative 1.5G to positive 1.5G, within 4 seconds. “This likely resulted in the occupants who were airborne to fall back down,” said MOT.

For comparison, the fastest roller coaster in the world in Dubai lets riders experience a G-force of 4.8G. Fighter pilots can tolerate can tolerate 5 to 9Gs, but they have fastened seatbelts among other safeguards. Over the next 24 seconds, there were more gradual fluctuations ranging from positive 0.9G to positive 1.1G. The aircraft returned to 37,000 ft 18 seconds after the pilots reengaged autopilot.

"As long as one wears a seat belt, things should still be quite safe," said Prof Merkert of typical instances of turbulence. Among other things, the autopilot is designed to help an aircraft maintain the desired altitude, speed and heading despite wind sheers and other factors, said Mr Shantanu.That is why pilots are unlikely to disengage the autopilot, except in extreme cases.

Investigation Singapore Airlines Ministry Of Transport

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