If I have already completed the return-to-duty process described in part 40, can I return to the performance of safety-sensitive functions while the FAA is conducting its investigation?
If you have completed the return-to-duty requirements described in the regulations (49 CFR part 40, subpart O), you may return to the performance of safety-sensitive work while the FAA is conducting its investigation. However, if you are returning to perform safety-sensitive duties that require a medical certificate issued by the FAA under 14 CFR part 67, you must meet the medical standards necessary to hold a medical certificate prior to returning to those duties, which is separate from the requirements described in 49 CFR part 40, subpart O.