March 27, 2023 | Susan Napier-Sewell

Cockpit Warnings, Violent Pitching, a Passenger Fatality

What happened over New England on March 3, 2023, when a business jet experienced wild pitching, then a passenger fatality?

The jet’s pilots switched off a system that aids aircraft stability, and it was initially assumed that the passenger fatality was caused by the violent pitching of the plane.

The NTSB (National Transportation Safety Board) included in its initial report a description of the things that went wrong during the plane’s loss of stability.

The AP (Associated Press)* reported, “Confronted with several alerts in the cockpit of the Bombardier jet, pilots followed a checklist and turned off a switch that ‘trims’ or adjusts the stabilizer on the plane’s tail, the [NTSB] report said.

“The plane’s nose then swept upward, subjecting the people inside to forces about four times the force of gravity, then pointed lower before again turning upward before pilots could regain control, the [NTSB] report said.

“Pilots told investigators they did not encounter turbulence, as the NTSB had said in an initial assessment the day after the incident.

“The trim system of the Bombardier Challenger 300 twin-engine jet was the subject of a Federal Aviation Administration mandate last year that pilots conduct extra safety checks before flights.

“Bombardier did not respond directly to the report’s contents, saying in a statement that it was ‘carefully studying’ it. In a previous statement, the Canadian manufacturer said it stood behind its Challenger 300 jets and their airworthiness.”

AP also reported that, “The two pilots and three passengers were traveling from Keene, New Hampshire, to Leesburg, Virginia, before diverting to Bradley International Airport in Connecticut. One passenger, Dana Hyde, 55, of Cabin John, Maryland, was brought to a hospital where she died from blunt-force injuries.

“The [NTSB] report indicated the pilots aborted their initial takeoff because no one removed a plastic cover from one of the exterior tubes that determine airspeed, and they took off with a rudder limiter fault alert on.

“Another warning indicated autopilot stabilizer trim failure. The plane abruptly pitched upward as the pilots moved the stabilizer trim switch from primary to off while working through procedures on a checklist, the [NTSB] report said.

“The plane violently oscillated up and down and the ‘stick pusher’ activated, the report said, meaning the onboard computer thought the plane was in danger of an aerodynamic stall.

“John Cox, a former airline pilot and now a safety consultant, said ‘there are definitely issues’ with the pilots’ preflight actions, but he said they reacted correctly when they followed the checklist for responding to trim failure.

“The flight crew was comprised of two experienced pilots with 5,000 and 8,000 hours of flying time, and held ratings needed to fly for an airline. But both were relatively new to the model of aircraft, earning their ratings last October.

“The FAA issued its directive about Bombardier Challenger 300 jets last year after multiple instances in which the horizontal stabilizer on the aircrafts caused the nose of the plane to turn down after the pilot tried to make the aircraft climb.”

* Content source/credit: AP, “Jet pitched wildly, killing 1, amid cockpit warnings: NTSB,” by Dave Collins and David Sharp, March 24, 2023.

Featured photo source/credit: Image by Kim Hunter from Pixabay.

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