[Code of Federal Regulations] [Title 14, Volume 2] [Revised as of January 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 14CFR63.41] [Page 429] TITLE 14--AERONAUTICS AND SPACE CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED) PART 63_CERTIFICATION: FLIGHT CREWMEMBERS OTHER THAN PILOTS--Table of Contents Subpart B_Flight Engineers Sec. 63.41 Retesting after failure. An applicant for a flight engineer certificate who fails a written test or practical test for that certificate may apply for retesting-- (a) After 30 days after the date he failed that test; or (b) After he has received additional practice or instruction (flight, synthetic trainer, or ground training, or any combination thereof) that is necessary, in the opinion of the Administrator or the applicant's instructor (if the Administrator has authorized him to determine the additional instruction necessary) to prepare the applicant for retesting.