Originally Posted by
DocYates
I can tell you that is absolutely false. If you fail an airman exam it can be for a multitude of reasons, the majority of which will not exclude one from a driver's license nor cause their cancellation. The rules written by the FAA in regards to the medical examination have become far more intrusive than in previous years and have included a multitude of new medications that are common in the general population which will make you exempt from a medical certificate.
Being denied an FAA medical certificate won't cost you your driver's license. Sorry about my bad wording. It just means you won't be able to fly a light-sport aircraft, whether or not you have a driver's license, because your driver's license would no longer be eligible to serve as a medical certificate. The only route available would be that of passing the third-class medical in that case.