Philadelphia Learjet 55 Crash: Spatial Disorientation Clues & Wrong-Runway Landings

In Episode 37 of NTSB News Talk, Max Trescott and Rob Mark examine new evidence from the fatal Learjet 55 air ambulance crash in Philadelphia and several other accidents with important lessons for pilots.

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The Learjet 55 departed Northeast Philadelphia Airport at night into a roughly 400-foot overcast. Newly released NTSB docket material shows the aircraft initially beginning its assigned right turn before slowly rolling left. The exceptionally gradual roll raises the possibility of somatogyral illusion—a form of spatial disorientation in which the inner ear may fail to detect slow rotational movement. Investigators also examined somatogravic illusion, cockpit workload, pitch trim, and the captain’s previous training history. Both engines appeared to be producing takeoff power, making an engine failure less likely.

Max and Rob also discuss two wrong-runway landings near Chicago that illustrate continuation bias and task saturation.

Other accidents include a Cirrus Vision Jet striking a pipe across a closed portion of a runway at Driggs, Idaho; a fatal Cessna 150 collision with a Pennsylvania State Police helicopter; N1850N a Beechcraft Duchess accident during simulated single-engine training; and a photographer fatally struck by the wing of glider N8217W. Also, two wrong-runway landings near Chicago, N772MR (Envoy 3936) and N1128M Learjet 60.

Those final incidents highlight a recurring human-factors problem: once pilots commit mentally to a plan, contradictory evidence can become surprisingly difficult to recognize.