“Rapid change” in g-force and altitude drop caused injuries in Singapore Airlines’ flight SQ321

“Rapid change in gravitational force” combined with a 54 metre altitude drop resulted in injuries suffered onboard flight SQ321, an investigation by the Singaporean Ministry of Transport (MOT) and its Transport Safety Investigation Bureau (TSIB) revealed. The MOT said: “This likely resulted in the occupants who were not belted up to become airborne. The 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. “The rapid changes in [g-force] over the 4.6 seconds duration resulted in an altitude drop of 178ft, from 37,362ft to 37,184ft.