This concept must always be in the forefront of pilots’ minds during all aspects of operations including when receiving an air traffic control clearance, instruction, or authorization (“clearance”). Pilots must determine whether they are able to safely execute all aspects of any clearance received prior to accepting and executing that clearance. Pilots are obligated to inform air traffic control (ATC) if they are unable to accept a clearance as given. Pilots are also obligated to obtain an amended clearance at any time they are no longer able to execute a clearance that was previously accepted (...)