AAIB investigation to Boeing 737-8K5, G-TAWD, 17 October 2023
Boeing 737-8K5 (G-TAWD), unpressurised flight above 10,000 ft, East coast of UK, North Lincolnshire, 17 October 2023
A cabin altitude warning was activated as the aircraft passed FL130. Both engine bleed air systems had been inadvertently left off for the departure, so the aircraft failed to pressurise. The crew selected both systems on and continued the climb. The aircraft then generated a pack caution, so the crew stopped the climb at FL200. After discussion with the operator’s maintenance control the commander decided to return to the departure airfield. Recorded data indicated that the cabin altitude warning remained on for 43 minutes. The crew did not don oxygen masks.
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