While failing an FAA Knowledge Test (Written Exam) is discouraging, it is not a "career killer," but it does have practical and financial consequences. If you fail, you must receive remedial instruction from an authorized flight instructor who will then "endorse" you to retake the test. This means you will spend more money on instructor fees and the testing fee itself (which is typically around $175 per attempt). From a long-term perspective, a single "fail" on a written exam rarely impacts your ability to get hired by major airlines, as they are much more concerned with your Practical Test (Checkride) performance. However, multiple failures on FAA exams can be seen as a "red flag" regarding your study habits and technical proficiency. In 2026, many airlines ask for your "FAA record" during the interview process, so it is always better to wait until you are consistently scoring 90% or higher on practice exams before attempting the real thing. A "passing" score is 70%, but most instructors aim for much higher to ensure the student truly understands the critical safety and navigation concepts.