SINGAPORE, May 31 — On the back of this week’s early official findings on the severe turbulence that hit Singapore Airlines (SIA) flight SQ321 on May 21, TODAY spoke to...
The Singapore Airlines Boeing 777-300ER airplane, which was headed to Singapore from London before making an emergency landing in Bangkok due to severe turbulence, is seen on the tarmac at Suvarnabhumi International Airport in Bangkok May 22, 2024. — AFP picSINGAPORE, May 31 — On the back of this week’s early official findings on the severe turbulence that hit Singapore Airlines flight SQ321 on May 21, TODAY spoke to aviation experts to better understand what they mean.
At 3.49.40pm Singapore time, the aircraft experienced a rapid change in gravitational force or G-force as “recorded vertical acceleration” fell from +1.35G to -1.5G within 0.6 of a second.This worked out to a 2.85G change, which likely caused the people onboard not wearing seat belts to become airborne.
File photo of the interior of Singapore Airlines flight SQ321 pictured after an emergency landing at Bangkok’s Suvarnabhumi International Airport, Thailand, May 21, 2024. — Reuters/Stringer picG-force is the force of gravity or acceleration on an object. It is measured in units of G, where 1G is the normal force of gravity at the Earth’s surface.
Mr Faris Iskandar, co-founder of flight school Aeroviation, said that a G-force in vertical acceleration means that there is a “sudden drop in height”.He also outlined the difference between positive and negative G-forces. “For a person, this sensation would feel like their body weight has tripled. For instance, if someone weighs 70 kg, under 3G, they would feel as if they weigh 210kg.”
Mr Faris said that autopilot is commonly engaged during long flights worldwide because it ensures that the plane remains within its assigned parameters and relieves the pilot’s workload. He added that autopilot is usually engaged in the various stages of a flight, depending on the specific flight operations and conditions.
“While autopilot enhances safety and efficiency, pilots remain actively involved, monitoring systems and ready to take manual control if necessary.” Clear air turbulence is turbulence that occurs in clear skies without any visible warning such as clouds or storms.
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