Zembla - Toxic Cockpits part 2

Three years ago, ZEMBLA revealed that the aviation sector is facing a huge problem: oil leaks in aircraft engines mean that passengers and crew are inhaling toxic substances.
MPs responded with horror but former Minister Eurlings assured there was no cause for concern. 

Government intervention was unnecessary. But flight personnel became increasingly anxious. Planes are still regularly returning to the airport because of the unbearable stench filling the cockpit and cabin.
When this happens, pilots put on their oxygen masks and crew members sometimes become ill. Why do airline companies continue to insist that there’s nothing to worry about? ZEMBLA investigates the ‘best-kept secret in aviation’.