Part 5/9:
In the face of chaos, Hunt took manual control of the aircraft, leaving McLand to assess the engine instruments without the benefit of prior simulator training in emergency scenarios. Crucially, Hunt misidentified the problematic engine: believing the right engine was at fault based on a combination of instinct and a faulty mental model derived from previous versions of the 737. Unbeknownst to them, both engines had different operational layouts in the 737-400, with cabin air drawn from both engines, which Hunt mistakenly believed served only the right engine.