The US Department of Transportion is now investigating the Federal Aviation Administration’s (FAA) approval of the Boeing 737 MAX planes and so far it would appear that it could be bad. In fact, much of the certification might have been done by Boeing themselves, and there appears to be significant differences between reality and what was certified*.
That might explain how the plane was certified and allowed to fly in USA. What about Europe? Well, the European Union Aviation Safety Agency (EASA) can rely on FAA approval alone…
A chain is as strong as the weakest link.
No matter what conclusion the US DoT reaches I hope EASA investigates this process and reevaluates the future of plan certifications.
*) The suspected cause for the crashes was considered hazardous, would not reset even if pilots took countermeasures and relied on a single sensor.