Discussion: Vector And Turn Analysis Of Observed And Measured
Flight Paths Of 9/11 WTC Aircraft Video footage depicts United
Airlines Flight 175 (UA 175) impacting World Trade Center tower
2 (WTC 2) on September 11, 2001 in New York City via a
trajectory comprised of two separate banked turns. The second
turn was apparently not required to generate impact. The first
turn, which maintains a constant angle of bank (AoB), is evident
at 1.2 miles before impact. Although human control of UA 175’s
observed maneuvers cannot be ruled out, the precise coordination
of variables such as the selections of a correct bank angle and
turn start time for the first turn apparently pose challenges to
the unaided human control hypothesis. The observed turn
stability favors the use of autopilot operation, either
functioning in a conventional course control mode or in Control
Wheel Steering (CWS) mode. The probability that either of these
two control systems were used is discussed. Flight deck images
of United and American airline