Kegworth air crash

On 8 January 1989, British Midland Flight 092, a brand-new Boeing 737-400, was en route from London Heathrow to Belfast. While climbing, a fan blade in the left-hand engine fractured, causing severe vibration and smoke to enter the cabin. In the high-pressure environment of the cockpit, the pilots—Captain Kevin Hunt and First Officer David McClelland—misinterpreted the symptoms. Believing the smoke was coming from the right-hand engine (due to their familiarity with older 737 models where the air conditioning intake was differently configured), they throttled back and eventually shut down the healthy right engine.

The AAIB investigation was exhaustive, involving a full reconstruction of the engine and an analysis of the "Glass Cockpit" instruments. The inquiry found that the new LED "vertical ribbon" engine displays were much harder for pilots to read at a glance compared to traditional circular dials. As the pilots prepared for an emergency landing at East Midlands Airport, the failed left engine finally gave out completely. With the right engine already shut down and unable to be restarted in time, the aircraft struck the embankment of the M1 motorway, just hundreds of yards short of the runway.

The report was a landmark in Crew Resource Management (CRM). It revealed a fatal breakdown in communication: several passengers and cabin crew had seen sparks and flames coming from the left engine, yet this information was never relayed to the cockpit because the staff assumed the pilots knew which engine was failing. The inquiry also led to significant changes in passenger safety; it was the first major study to analyse "brace positions" in detail, leading to the standardized brace posture used globally today. The AAIB concluded that while the mechanical failure started the chain of events, the "human factor" of shutting down the wrong engine was the primary cause of the catastrophe.