A liveryman of the Guild of Air Pilots and Air Navigators , and a Fellow of the Royal Aeronautical Society , Orlebar was in high demand as a lecturer and as a contributor to radio and TV programmes . Orlebar 's expertise was called upon particularly following the crash of a Concorde in Paris in 2000 . He was diagnosed with Parkinson 's disease in 1998
crash of a Concorde
Air France Flight 4590
Christopher Orlebar