Final answer:
An inoperative altitude alerting system on a turbo-jet after takeoff may allow the aircraft to continue flying with restrictions, by following operator procedures and regulatory requirements such as those of the FAA or equivalent authority.
Step-by-step explanation:
If an altitude alerting system on a turbo-jet becomes inoperative after takeoff and there is no Minimum Equipment List (MEL) that covers this situation, the aircraft might still be operated under specific conditions. The crew should follow the aircraft's operator procedures, which typically involve reporting the inoperative equipment to the appropriate air traffic control (ATC) and maintenance personnel as soon as practicable. It is also essential to consult the regulatory requirements such as those put forth by the Federal Aviation Administration (FAA) or the relevant civil aviation authority. These requirements might necessitate a return to the airport or continuation of the flight with certain restrictions. Most operators have established protocols for dealing with inoperative equipment, and these might allow for the continuation of the flight with heightened awareness and potential operational limitations.