sia777SINGAPORE—The Singapore Airs (SIA) Boeing 777-300ER that suffered severe turbulence on May 21 experienced a gravitational force shift from +1.35G to -1.5G overFORWARD ZONE FORWARD ZONE Boeing 777-300 Extended Range 4-class First Class Seat First Class - F 4 seats Bassinet C H 49 49 50 50 51 51 52 52 53 53 54 54 A B D E G