Show Notes
A pilot on final approach to Birmingham suddenly saw double as oil vapors from the APU seal blurred the cockpit - how did that expose them?
The APU seal leaked oil vapors that blurred the pilots' vision
In this episode, we lay out the sequence of events, technical details, and institutional responses surrounding the November 5, 2000 Birmingham approach where both pilots lost the ability to judge height and vision was impaired. The episode traces bleed-air mechanics, the APU seal leak identified in the investigation, and the contested debate over contamination and health effects that followed.
Date: November 5, 2000 Location: Birmingham Aircraft registration: G-JEAK Event: APU cooling fan seal leak into environmental control system; fume event reported Topic: Bleed air contamination and disputed health effects (aerotoxic syndrome)
- The flight descended through cloud cover with both pilots simultaneously losing clear visual judgment and one seeing double. - Investigators documented an oil leak from the APU cooling fan seal into the environmental control system after the aircraft landed. - The official report described only "circumstantial evidence" of contamination and found no definitive medical cause. - Synthetic jet oils contain tricresyl phosphate (TCP), which decomposes under bleed-air heat into compounds crews described as acrid, heated-plastic smells linked to headaches and coordination problems. - Industry studies and FAA-funded research diverged on incident frequency, citing one-in-5,000 versus one-in-22,000 flights experiencing fume events, shaping a long-running institutional dispute.
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